[置顶] 关于iOS常用的26中公共方法，可copy的代码

1. 获取磁盘总空间大小

<textarea class="crayon-plain print-no" data-settings="dblclick" readonly="readonly" style="-moz-tab-size: 4; font-size: 13px ! important; line-height: 15px ! important; z-index: 0; opacity: 0;" wrap="soft">//磁盘总空间 + (CGFloat)diskOfAllSizeMBytes{ CGFloat size = 0.0; NSError *error; NSDictionary *dic = [[NSFileManager defaultManager] attributesOfFileSystemForPath:NSHomeDirectory() error:&amp;error]; if (error) { #ifdef DEBUG NSLog(@&quot;error: %@&quot;, error.localizedDescription); #endif }else{ NSNumber *number = [dic objectForKey:NSFileSystemSize]; size = [number floatValue]/1024/1024; } return size; }</textarea>

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//磁盘总空间 + ( CGFloat ) diskOfAllSizeMBytes {      CGFloat size = 0.0 ;      NSError *error ;      NSDictionary *dic = [ [ NSFileManager defaultManager ] attributesOfFileSystemForPath :NSHomeDirectory ( ) error : & error ] ;      if ( error ) { #ifdef DEBUG          NSLog ( @"error: %@" , error . localizedDescription ) ; #endif      } else {          NSNumber *number = [ dic objectForKey :NSFileSystemSize ] ;          size = [ number floatValue ] / 1024 / 1024 ;      }      return size ; }

2. 获取磁盘可用空间大小

<textarea class="crayon-plain print-no" data-settings="dblclick" readonly="readonly" style="-moz-tab-size: 4; font-size: 13px ! important; line-height: 15px ! important; z-index: 0; opacity: 0;" wrap="soft">//磁盘可用空间 + (CGFloat)diskOfFreeSizeMBytes{ CGFloat size = 0.0; NSError *error; NSDictionary *dic = [[NSFileManager defaultManager] attributesOfFileSystemForPath:NSHomeDirectory() error:&amp;error]; if (error) { #ifdef DEBUG NSLog(@&quot;error: %@&quot;, error.localizedDescription); #endif }else{ NSNumber *number = [dic objectForKey:NSFileSystemFreeSize]; size = [number floatValue]/1024/1024; } return size; }</textarea>

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//磁盘可用空间 + ( CGFloat ) diskOfFreeSizeMBytes {      CGFloat size = 0.0 ;      NSError *error ;      NSDictionary *dic = [ [ NSFileManager defaultManager ] attributesOfFileSystemForPath :NSHomeDirectory ( ) error : & error ] ;      if ( error ) { #ifdef DEBUG          NSLog ( @"error: %@" , error . localizedDescription ) ; #endif      } else {          NSNumber *number = [ dic objectForKey :NSFileSystemFreeSize ] ;          size = [ number floatValue ] / 1024 / 1024 ;      }      return size ; }

3. 获取指定路径下某个文件的大小

<textarea class="crayon-plain print-no" data-settings="dblclick" readonly="readonly" style="-moz-tab-size: 4; font-size: 13px ! important; line-height: 15px ! important; z-index: 0; opacity: 0;" wrap="soft">//获取文件大小 + (long long)fileSizeAtPath:(NSString *)filePath{ NSFileManager *fileManager = [NSFileManager defaultManager]; if (![fileManager fileExistsAtPath:filePath]) return 0; return [[fileManager attributesOfItemAtPath:filePath error:nil] fileSize]; }</textarea>

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//获取文件大小 + ( long long ) fileSizeAtPath : ( NSString * ) filePath {      NSFileManager *fileManager = [ NSFileManager defaultManager ] ;      if ( ! [ fileManager fileExistsAtPath :filePath ] ) return 0 ;      return [ [ fileManager attributesOfItemAtPath :filePath error :nil ] fileSize ] ; }

4. 获取文件夹下所有文件的大小

<textarea class="crayon-plain print-no" data-settings="dblclick" readonly="readonly" style="-moz-tab-size: 4; font-size: 13px ! important; line-height: 15px ! important; z-index: 0; opacity: 0;" wrap="soft">//获取文件夹下所有文件的大小 + (long long)folderSizeAtPath:(NSString *)folderPath{ NSFileManager *fileManager = [NSFileManager defaultManager]; if (![fileManager fileExistsAtPath:folderPath]) return 0; NSEnumerator *filesEnumerator = [[fileManager subpathsAtPath:folderPath] objectEnumerator]; NSString *fileName; long long folerSize = 0; while ((fileName = [filesEnumerator nextObject]) != nil) { NSString *filePath = [folderPath stringByAppendingPathComponent:fileName]; folerSize += [self fileSizeAtPath:filePath]; } return folerSize; }</textarea>

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//获取文件夹下所有文件的大小 + ( long long ) folderSizeAtPath : ( NSString * ) folderPath {      NSFileManager *fileManager = [ NSFileManager defaultManager ] ;      if ( ! [ fileManager fileExistsAtPath :folderPath ] ) return 0 ;      NSEnumerator *filesEnumerator = [ [ fileManager subpathsAtPath :folderPath ] objectEnumerator ] ;      NSString *fileName ;      long long folerSize = 0 ;      while ( ( fileName = [ filesEnumerator nextObject ] ) != nil ) {          NSString *filePath = [ folderPath stringByAppendingPathComponent :fileName ] ;          folerSize += [ self fileSizeAtPath :filePath ] ;      }      return folerSize ; }

5. 获取字符串(或汉字)首字母

<textarea class="crayon-plain print-no" data-settings="dblclick" readonly="readonly" style="-moz-tab-size: 4; font-size: 13px ! important; line-height: 15px ! important; z-index: 0; opacity: 0;" wrap="soft">//获取字符串(或汉字)首字母 + (NSString *)firstCharacterWithString:(NSString *)string{ NSMutableString *str = [NSMutableString stringWithString:string]; CFStringTransform((CFMutableStringRef)str, NULL, kCFStringTransformMandarinLatin, NO); CFStringTransform((CFMutableStringRef)str, NULL, kCFStringTransformStripDiacritics, NO); NSString *pingyin = [str capitalizedString]; return [pingyin substringToIndex:1]; }</textarea>

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//获取字符串(或汉字)首字母 + ( NSString * ) firstCharacterWithString : ( NSString * ) string {      NSMutableString *str = [ NSMutableString stringWithString :string ] ;      CFStringTransform ( ( CFMutableStringRef ) str , NULL , kCFStringTransformMandarinLatin , NO ) ;      CFStringTransform ( ( CFMutableStringRef ) str , NULL , kCFStringTransformStripDiacritics , NO ) ;      NSString *pingyin = [ str capitalizedString ] ;      return [ pingyin substringToIndex : 1 ] ; }

6. 将字符串数组按照元素首字母顺序进行排序分组

<textarea class="crayon-plain print-no" data-settings="dblclick" readonly="readonly" style="-moz-tab-size: 4; font-size: 13px ! important; line-height: 15px ! important; z-index: 0; opacity: 0;" wrap="soft">//将字符串数组按照元素首字母顺序进行排序分组 + (NSDictionary *)dictionaryOrderByCharacterWithOriginalArray:(NSArray *)array{ if (array.count == 0) { return nil; } for (id obj in array) { if (![obj isKindOfClass:[NSString class]]) { return nil; } } UILocalizedIndexedCollation *indexedCollation = [UILocalizedIndexedCollation currentCollation]; NSMutableArray *objects = [NSMutableArray arrayWithCapacity:indexedCollation.sectionTitles.count]; //创建27个分组数组 for (int i = 0; i &lt; indexedCollation.sectionTitles.count; i++) { NSMutableArray *obj = [NSMutableArray array]; [objects addObject:obj]; } NSMutableArray *keys = [NSMutableArray arrayWithCapacity:objects.count]; //按字母顺序进行分组 NSInteger lastIndex = -1; for (int i = 0; i &lt; array.count; i++) { NSInteger index = [indexedCollation sectionForObject:array[i] collationStringSelector:@selector(uppercaseString)]; [[objects objectAtIndex:index] addObject:array[i]]; lastIndex = index; } //去掉空数组 for (int i = 0; i &lt; objects.count; i++) { NSMutableArray *obj = objects[i]; if (obj.count == 0) { [objects removeObject:obj]; } } //获取索引字母 for (NSMutableArray *obj in objects) { NSString *str = obj[0]; NSString *key = [self firstCharacterWithString:str]; [keys addObject:key]; } NSMutableDictionary *dic = [NSMutableDictionary dictionary]; [dic setObject:objects forKey:keys]; return dic; } //获取字符串(或汉字)首字母 + (NSString *)firstCharacterWithString:(NSString *)string{ NSMutableString *str = [NSMutableString stringWithString:string]; CFStringTransform((CFMutableStringRef)str, NULL, kCFStringTransformMandarinLatin, NO); CFStringTransform((CFMutableStringRef)str, NULL, kCFStringTransformStripDiacritics, NO); NSString *pingyin = [str capitalizedString]; return [pingyin substringToIndex:1]; }</textarea>

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//将字符串数组按照元素首字母顺序进行排序分组 + ( NSDictionary * ) dictionaryOrderByCharacterWithOriginalArray : ( NSArray * ) array {      if ( array . count == 0 ) {          return nil ;      }      for ( id obj in array ) {          if ( ! [ obj isKindOfClass : [ NSString class ] ] ) {              return nil ;          }      }      UILocalizedIndexedCollation *indexedCollation = [ UILocalizedIndexedCollation currentCollation ] ;      NSMutableArray *objects = [ NSMutableArray arrayWithCapacity :indexedCollation . sectionTitles . count ] ;      //创建27个分组数组      for ( int i = 0 ; i < indexedCollation . sectionTitles . count ; i ++ ) {          NSMutableArray *obj = [ NSMutableArray array ] ;          [ objects addObject :obj ] ;      }      NSMutableArray *keys = [ NSMutableArray arrayWithCapacity :objects . count ] ;      //按字母顺序进行分组      NSInteger lastIndex = - 1 ;      for ( int i = 0 ; i < array . count ; i ++ ) {          NSInteger index = [ indexedCollation sectionForObject :array [ i ] collationStringSelector : @selector ( uppercaseString ) ] ;          [ [ objects objectAtIndex :index ] addObject :array [ i ] ] ;          lastIndex = index ;      }      //去掉空数组      for ( int i = 0 ; i < objects . count ; i ++ ) {          NSMutableArray *obj = objects [ i ] ;          if ( obj . count == 0 ) {              [ objects removeObject :obj ] ;          }      }      //获取索引字母      for ( NSMutableArray *obj in objects ) {          NSString *str = obj [ 0 ] ;          NSString *key = [ self firstCharacterWithString :str ] ;          [ keys addObject :key ] ;      }      NSMutableDictionary *dic = [ NSMutableDictionary dictionary ] ;      [ dic setObject :objects forKey :keys ] ;      return dic ; }   //获取字符串(或汉字)首字母 + ( NSString * ) firstCharacterWithString : ( NSString * ) string {      NSMutableString *str = [ NSMutableString stringWithString :string ] ;      CFStringTransform ( ( CFMutableStringRef ) str , NULL , kCFStringTransformMandarinLatin , NO ) ;      CFStringTransform ( ( CFMutableStringRef ) str , NULL , kCFStringTransformStripDiacritics , NO ) ;      NSString *pingyin = [ str capitalizedString ] ;      return [ pingyin substringToIndex : 1 ] ; }

使用如下:

<textarea class="crayon-plain print-no" data-settings="dblclick" readonly="readonly" style="-moz-tab-size: 4; font-size: 13px ! important; line-height: 15px ! important; z-index: 0; opacity: 0;" wrap="soft">NSArray *arr = @[@&quot;guangzhou&quot;, @&quot;shanghai&quot;, @&quot;北京&quot;, @&quot;henan&quot;, @&quot;hainan&quot;]; NSDictionary *dic = [Utilities dictionaryOrderByCharacterWithOriginalArray:arr]; NSLog(@&quot;\n\ndic: %@&quot;, dic);</textarea>

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NSArray *arr = @ [ @"guangzhou" , @"shanghai" , @"北京" , @"henan" , @"hainan" ] ; NSDictionary *dic = [ Utilities dictionaryOrderByCharacterWithOriginalArray :arr ] ; NSLog ( @"\n\ndic: %@" , dic ) ;

输出结果如下:

输出结果

7. 获取当前时间<textarea class="crayon-plain print-no" data-settings="dblclick" readonly="readonly" style="-moz-tab-size: 4; font-size: 13px ! important; line-height: 15px ! important; z-index: 0; opacity: 0;" wrap="soft">//获取当前时间</textarea><textarea class="crayon-plain print-no" data-settings="dblclick" readonly="readonly" style="-moz-tab-size: 4; font-size: 13px ! important; line-height: 15px ! important; z-index: 0; opacity: 0;" wrap="soft">//format: @&quot;yyyy-MM-dd HH:mm:ss&quot;、@&quot;yyyy年MM月dd日 HH时mm分ss秒&quot; </textarea>

<textarea class="crayon-plain print-no" data-settings="dblclick" readonly="readonly" style="-moz-tab-size: 4; font-size: 13px ! important; line-height: 15px ! important; z-index: 0; opacity: 0;" wrap="soft">+ (NSString *)currentDateWithFormat:(NSString *)format{ NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; [dateFormatter setDateFormat:format]; return [dateFormatter stringFromDate:[NSDate date]]; }</textarea>

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//获取当前时间 //format: @"yyyy-MM-dd HH:mm:ss"、@"yyyy年MM月dd日 HH时mm分ss秒" + ( NSString * ) currentDateWithFormat : ( NSString * ) format {      NSDateFormatter *dateFormatter = [ [ NSDateFormatter alloc ] init ] ;      [ dateFormatter setDateFormat :format ] ;      return [ dateFormatter stringFromDate : [ NSDate date ] ] ; }

8. 计算上次日期距离现在多久, 如 xx 小时前、xx 分钟前等

<textarea class="crayon-plain print-no" data-settings="dblclick" readonly="readonly" style="-moz-tab-size: 4; font-size: 13px ! important; line-height: 15px ! important; z-index: 0; opacity: 0;" wrap="soft">/** * 计算上次日期距离现在多久 * * @param lastTime 上次日期(需要和格式对应) * @param format1 上次日期格式 * @param currentTime 最近日期(需要和格式对应) * @param format2 最近日期格式 * * @return xx分钟前、xx小时前、xx天前 */ + (NSString *)timeIntervalFromLastTime:(NSString *)lastTime lastTimeFormat:(NSString *)format1 ToCurrentTime:(NSString *)currentTime currentTimeFormat:(NSString *)format2{ //上次时间 NSDateFormatter *dateFormatter1 = [[NSDateFormatter alloc]init]; dateFormatter1.dateFormat = format1; NSDate *lastDate = [dateFormatter1 dateFromString:lastTime]; //当前时间 NSDateFormatter *dateFormatter2 = [[NSDateFormatter alloc]init]; dateFormatter2.dateFormat = format2; NSDate *currentDate = [dateFormatter2 dateFromString:currentTime]; return [Utilities timeIntervalFromLastTime:lastDate ToCurrentTime:currentDate]; } + (NSString *)timeIntervalFromLastTime:(NSDate *)lastTime ToCurrentTime:(NSDate *)currentTime{ NSTimeZone *timeZone = [NSTimeZone systemTimeZone]; //上次时间 NSDate *lastDate = [lastTime dateByAddingTimeInterval:[timeZone secondsFromGMTForDate:lastTime]]; //当前时间 NSDate *currentDate = [currentTime dateByAddingTimeInterval:[timeZone secondsFromGMTForDate:currentTime]]; //时间间隔 NSInteger intevalTime = [currentDate timeIntervalSinceReferenceDate] - [lastDate timeIntervalSinceReferenceDate]; //秒、分、小时、天、月、年 NSInteger minutes = intevalTime / 60; NSInteger hours = intevalTime / 60 / 60; NSInteger day = intevalTime / 60 / 60 / 24; NSInteger month = intevalTime / 60 / 60 / 24 / 30; NSInteger yers = intevalTime / 60 / 60 / 24 / 365; if (minutes &lt;= 10) { return @&quot;刚刚&quot;; }else if (minutes &lt; 60){ return [NSString stringWithFormat: @&quot;%ld分钟前&quot;,(long)minutes]; }else if (hours &lt; 24){ return [NSString stringWithFormat: @&quot;%ld小时前&quot;,(long)hours]; }else if (day &lt; 30){ return [NSString stringWithFormat: @&quot;%ld天前&quot;,(long)day]; }else if (month &lt; 12){ NSDateFormatter * df =[[NSDateFormatter alloc]init]; df.dateFormat = @&quot;M月d日&quot;; NSString * time = [df stringFromDate:lastDate]; return time; }else if (yers &gt;= 1){ NSDateFormatter * df =[[NSDateFormatter alloc]init]; df.dateFormat = @&quot;yyyy年M月d日&quot;; NSString * time = [df stringFromDate:lastDate]; return time; } return @&quot;&quot;; }</textarea>

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/** *  计算上次日期距离现在多久 * *  @param lastTime    上次日期(需要和格式对应) *  @param format1     上次日期格式 *  @param currentTime 最近日期(需要和格式对应) *  @param format2     最近日期格式 * *  @return xx分钟前、xx小时前、xx天前 */ + ( NSString * ) timeIntervalFromLastTime : ( NSString * ) lastTime                         lastTimeFormat : ( NSString * ) format1                          ToCurrentTime : ( NSString * ) currentTime                      currentTimeFormat : ( NSString * ) format2 {      //上次时间      NSDateFormatter *dateFormatter1 = [ [ NSDateFormatter alloc ] init ] ;      dateFormatter1 . dateFormat = format1 ;      NSDate *lastDate = [ dateFormatter1 dateFromString :lastTime ] ;      //当前时间      NSDateFormatter *dateFormatter2 = [ [ NSDateFormatter alloc ] init ] ;      dateFormatter2 . dateFormat = format2 ;      NSDate *currentDate = [ dateFormatter2 dateFromString :currentTime ] ;      return [ Utilities timeIntervalFromLastTime :lastDate ToCurrentTime :currentDate ] ; }   + ( NSString * ) timeIntervalFromLastTime : ( NSDate * ) lastTime ToCurrentTime : ( NSDate * ) currentTime {      NSTimeZone *timeZone = [ NSTimeZone systemTimeZone ] ;      //上次时间      NSDate *lastDate = [ lastTime dateByAddingTimeInterval : [ timeZone secondsFromGMTForDate :lastTime ] ] ;      //当前时间      NSDate *currentDate = [ currentTime dateByAddingTimeInterval : [ timeZone secondsFromGMTForDate :currentTime ] ] ;      //时间间隔      NSInteger intevalTime = [ currentDate timeIntervalSinceReferenceDate ] - [ lastDate timeIntervalSinceReferenceDate ] ;        //秒、分、小时、天、月、年      NSInteger minutes = intevalTime / 60 ;      NSInteger hours = intevalTime / 60 / 60 ;      NSInteger day = intevalTime / 60 / 60 / 24 ;      NSInteger month = intevalTime / 60 / 60 / 24 / 30 ;      NSInteger yers = intevalTime / 60 / 60 / 24 / 365 ;        if ( minutes <= 10 ) {          return    @"刚刚" ;      } else if ( minutes < 60 ) {          return [ NSString stringWithFormat : @"%ld分钟前" , ( long ) minutes ] ;      } else if ( hours < 24 ) {          return [ NSString stringWithFormat : @"%ld小时前" , ( long ) hours ] ;      } else if ( day < 30 ) {          return [ NSString stringWithFormat : @"%ld天前" , ( long ) day ] ;      } else if ( month < 12 ) {          NSDateFormatter * df = [ [ NSDateFormatter alloc ] init ] ;          df . dateFormat = @"M月d日" ;          NSString * time = [ df stringFromDate :lastDate ] ;          return time ;      } else if ( yers >= 1 ) {          NSDateFormatter * df = [ [ NSDateFormatter alloc ] init ] ;          df . dateFormat = @"yyyy年M月d日" ;          NSString * time = [ df stringFromDate :lastDate ] ;          return time ;      }      return @"" ; }

使用如下:

<textarea class="crayon-plain print-no" data-settings="dblclick" readonly="readonly" style="-moz-tab-size: 4; font-size: 13px ! important; line-height: 15px ! important; z-index: 0; opacity: 0;" wrap="soft">NSLog(@&quot;\n\nresult: %@&quot;, [Utilities timeIntervalFromLastTime:@&quot;2015年12月8日 15:50&quot; lastTimeFormat:@&quot;yyyy年MM月dd日 HH:mm&quot; ToCurrentTime:@&quot;2015/12/08 16:12&quot; currentTimeFormat:@&quot;yyyy/MM/dd HH:mm&quot;]);</textarea>

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NSLog ( @"\n\nresult: %@" , [ Utilities timeIntervalFromLastTime : @"2015年12月8日 15:50"                                            lastTimeFormat : @"yyyy年MM月dd日 HH:mm"                                             ToCurrentTime : @"2015/12/08 16:12"                                         currentTimeFormat : @"yyyy/MM/dd HH:mm" ] ) ;

输出结果如下:

输出结果

9. 判断手机号码格式是否正确

<textarea class="crayon-plain print-no" data-settings="dblclick" readonly="readonly" style="-moz-tab-size: 4; font-size: 13px ! important; line-height: 15px ! important; z-index: 0; opacity: 0;" wrap="soft">//判断手机号码格式是否正确 + (BOOL)valiMobile:(NSString *)mobile{ mobile = [mobile stringByReplacingOccurrencesOfString:@&quot; &quot; withString:@&quot;&quot;]; if (mobile.length != 11) { return NO; }else{ /** * 移动号段正则表达式 */ NSString *CM_NUM = @&quot;^((13[4-9])|(147)|(15[0-2,7-9])|(178)|(18[2-4,7-8]))\\d{8}|(1705)\\d{7}$&quot;; /** * 联通号段正则表达式 */ NSString *CU_NUM = @&quot;^((13[0-2])|(145)|(15[5-6])|(176)|(18[5,6]))\\d{8}|(1709)\\d{7}$&quot;; /** * 电信号段正则表达式 */ NSString *CT_NUM = @&quot;^((133)|(153)|(177)|(18[0,1,9]))\\d{8}$&quot;; NSPredicate *pred1 = [NSPredicate predicateWithFormat:@&quot;SELF MATCHES %@&quot;, CM_NUM]; BOOL isMatch1 = [pred1 evaluateWithObject:mobile]; NSPredicate *pred2 = [NSPredicate predicateWithFormat:@&quot;SELF MATCHES %@&quot;, CU_NUM]; BOOL isMatch2 = [pred2 evaluateWithObject:mobile]; NSPredicate *pred3 = [NSPredicate predicateWithFormat:@&quot;SELF MATCHES %@&quot;, CT_NUM]; BOOL isMatch3 = [pred3 evaluateWithObject:mobile]; if (isMatch1 || isMatch2 || isMatch3) { return YES; }else{ return NO; } } </textarea>

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//判断手机号码格式是否正确 + ( BOOL ) valiMobile : ( NSString * ) mobile {      mobile = [ mobile stringByReplacingOccurrencesOfString : @" " withString : @"" ] ;      if ( mobile . length != 11 )      {          return NO ;      } else {          /**          * 移动号段正则表达式          */          NSString *CM_NUM = @"^((13[4-9])|(147)|(15[0-2,7-9])|(178)|(18[2-4,7-8]))\\d{8}|(1705)\\d{7}$" ;          /**          * 联通号段正则表达式          */          NSString *CU_NUM = @"^((13[0-2])|(145)|(15[5-6])|(176)|(18[5,6]))\\d{8}|(1709)\\d{7}$" ;          /**          * 电信号段正则表达式          */          NSString *CT_NUM = @"^((133)|(153)|(177)|(18[0,1,9]))\\d{8}$" ;          NSPredicate *pred1 = [ NSPredicate predicateWithFormat : @"SELF MATCHES %@" , CM_NUM ] ;          BOOL isMatch1 = [ pred1 evaluateWithObject :mobile ] ;          NSPredicate *pred2 = [ NSPredicate predicateWithFormat : @"SELF MATCHES %@" , CU_NUM ] ;          BOOL isMatch2 = [ pred2 evaluateWithObject :mobile ] ;          NSPredicate *pred3 = [ NSPredicate predicateWithFormat : @"SELF MATCHES %@" , CT_NUM ] ;          BOOL isMatch3 = [ pred3 evaluateWithObject :mobile ] ;            if ( isMatch1 || isMatch2 || isMatch3 ) {              return YES ;          } else {              return NO ;          }      } }

10. 判断邮箱格式是否正确

<textarea class="crayon-plain print-no" data-settings="dblclick" readonly="readonly" style="-moz-tab-size: 4; font-size: 13px ! important; line-height: 15px ! important; z-index: 0; opacity: 0;" wrap="soft">//利用正则表达式验证 + (BOOL)isAvailableEmail:(NSString *)email { NSString *emailRegex = @&quot;[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}&quot;; NSPredicate *emailTest = [NSPredicate predicateWithFormat:@&quot;SELF MATCHES %@&quot;, emailRegex]; return [emailTest evaluateWithObject:email]; }</textarea>

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//利用正则表达式验证 + ( BOOL ) isAvailableEmail : ( NSString * ) email {      NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}" ;      NSPredicate *emailTest = [ NSPredicate predicateWithFormat : @"SELF MATCHES %@" , emailRegex ] ;      return [ emailTest evaluateWithObject :email ] ; }

11. 将十六进制颜色转换为 UIColor 对象

<textarea class="crayon-plain print-no" data-settings="dblclick" readonly="readonly" style="-moz-tab-size: 4; font-size: 13px ! important; line-height: 15px ! important; z-index: 0; opacity: 0;" wrap="soft">//将十六进制颜色转换为 UIColor 对象 + (UIColor *)colorWithHexString:(NSString *)color{ NSString *cString = [[color stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString]; // String should be 6 or 8 characters if ([cString length] &lt; 6) { return [UIColor clearColor]; } // strip &quot;0X&quot; or &quot;#&quot; if it appears if ([cString hasPrefix:@&quot;0X&quot;]) cString = [cString substringFromIndex:2]; if ([cString hasPrefix:@&quot;#&quot;]) cString = [cString substringFromIndex:1]; if ([cString length] != 6) return [UIColor clearColor]; // Separate into r, g, b substrings NSRange range; range.location = 0; range.length = 2; //r NSString *rString = [cString substringWithRange:range]; //g range.location = 2; NSString *gString = [cString substringWithRange:range]; //b range.location = 4; NSString *bString = [cString substringWithRange:range]; // Scan values unsigned int r, g, b; [[NSScanner scannerWithString:rString] scanHexInt:&amp;r]; [[NSScanner scannerWithString:gString] scanHexInt:&amp;g]; [[NSScanner scannerWithString:bString] scanHexInt:&amp;b]; return [UIColor colorWithRed:((float) r / 255.0f) green:((float) g / 255.0f) blue:((float) b / 255.0f) alpha:1.0f]; }</textarea>

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//将十六进制颜色转换为 UIColor 对象 + ( UIColor * ) colorWithHexString : ( NSString * ) color {      NSString *cString = [ [ color stringByTrimmingCharactersInSet : [ NSCharacterSet whitespaceAndNewlineCharacterSet ] ] uppercaseString ] ;      // String should be 6 or 8 characters      if ( [ cString length ] < 6 ) {          return [ UIColor clearColor ] ;      }      // strip "0X" or "#" if it appears      if ( [ cString hasPrefix : @"0X" ] )          cString = [ cString substringFromIndex : 2 ] ;      if ( [ cString hasPrefix : @"#" ] )          cString = [ cString substringFromIndex : 1 ] ;      if ( [ cString length ] != 6 )          return [ UIColor clearColor ] ;      // Separate into r, g, b substrings      NSRange range ;      range . location = 0 ;      range . length = 2 ;      //r      NSString *rString = [ cString substringWithRange :range ] ;      //g      range . location = 2 ;      NSString *gString = [ cString substringWithRange :range ] ;      //b      range . location = 4 ;      NSString *bString = [ cString substringWithRange :range ] ;      // Scan values      unsigned int r , g , b ;      [ [ NSScanner scannerWithString :rString ] scanHexInt : & r ] ;      [ [ NSScanner scannerWithString :gString ] scanHexInt : & g ] ;      [ [ NSScanner scannerWithString :bString ] scanHexInt : & b ] ;      return [ UIColor colorWithRed : ( ( float ) r / 255.0f ) green : ( ( float ) g / 255.0f ) blue : ( ( float ) b / 255.0f ) alpha : 1.0f ] ; }

12. 对图片进行滤镜处理

<textarea class="crayon-plain print-no" data-settings="dblclick" readonly="readonly" style="-moz-tab-size: 4; font-size: 13px ! important; line-height: 15px ! important; z-index: 0; opacity: 0;" wrap="soft">#pragma mark - 对图片进行滤镜处理 // 怀旧 --&gt; CIPhotoEffectInstant 单色 --&gt; CIPhotoEffectMono // 黑白 --&gt; CIPhotoEffectNoir 褪色 --&gt; CIPhotoEffectFade // 色调 --&gt; CIPhotoEffectTonal 冲印 --&gt; CIPhotoEffectProcess // 岁月 --&gt; CIPhotoEffectTransfer 铬黄 --&gt; CIPhotoEffectChrome // CILinearToSRGBToneCurve, CISRGBToneCurveToLinear, CIGaussianBlur, CIBoxBlur, CIDiscBlur, CISepiaTone, CIDepthOfField + (UIImage *)filterWithOriginalImage:(UIImage *)image filterName:(NSString *)name{ CIContext *context = [CIContext contextWithOptions:nil]; CIImage *inputImage = [[CIImage alloc] initWithImage:image]; CIFilter *filter = [CIFilter filterWithName:name]; [filter setValue:inputImage forKey:kCIInputImageKey]; CIImage *result = [filter valueForKey:kCIOutputImageKey]; CGImageRef cgImage = [context createCGImage:result fromRect:[result extent]]; UIImage *resultImage = [UIImage imageWithCGImage:cgImage]; CGImageRelease(cgImage); return resultImage; }</textarea>

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#pragma mark - 对图片进行滤镜处理 // 怀旧 --> CIPhotoEffectInstant                         单色 --> CIPhotoEffectMono // 黑白 --> CIPhotoEffectNoir                            褪色 --> CIPhotoEffectFade // 色调 --> CIPhotoEffectTonal                           冲印 --> CIPhotoEffectProcess // 岁月 --> CIPhotoEffectTransfer                        铬黄 --> CIPhotoEffectChrome // CILinearToSRGBToneCurve, CISRGBToneCurveToLinear, CIGaussianBlur, CIBoxBlur, CIDiscBlur, CISepiaTone, CIDepthOfField + ( UIImage * ) filterWithOriginalImage : ( UIImage * ) image filterName : ( NSString * ) name {      CIContext *context = [ CIContext contextWithOptions :nil ] ;      CIImage *inputImage = [ [ CIImage alloc ] initWithImage :image ] ;      CIFilter *filter = [ CIFilter filterWithName :name ] ;      [ filter setValue :inputImage forKey :kCIInputImageKey ] ;      CIImage *result = [ filter valueForKey :kCIOutputImageKey ] ;      CGImageRef cgImage = [ context createCGImage :result fromRect : [ result extent ] ] ;      UIImage *resultImage = [ UIImage imageWithCGImage :cgImage ] ;      CGImageRelease ( cgImage ) ;      return resultImage ; }

13. 对图片进行模糊处理

<textarea class="crayon-plain print-no" data-settings="dblclick" readonly="readonly" style="-moz-tab-size: 4; font-size: 13px ! important; line-height: 15px ! important; z-index: 0; opacity: 0;" wrap="soft">#pragma mark - 对图片进行模糊处理 // CIGaussianBlur ---&gt; 高斯模糊 // CIBoxBlur ---&gt; 均值模糊(Available in iOS 9.0 and later) // CIDiscBlur ---&gt; 环形卷积模糊(Available in iOS 9.0 and later) // CIMedianFilter ---&gt; 中值模糊, 用于消除图像噪点, 无需设置radius(Available in iOS 9.0 and later) // CIMotionBlur ---&gt; 运动模糊, 用于模拟相机移动拍摄时的扫尾效果(Available in iOS 9.0 and later) + (UIImage *)blurWithOriginalImage:(UIImage *)image blurName:(NSString *)name radius:(NSInteger)radius{ CIContext *context = [CIContext contextWithOptions:nil]; CIImage *inputImage = [[CIImage alloc] initWithImage:image]; CIFilter *filter; if (name.length != 0) { filter = [CIFilter filterWithName:name]; [filter setValue:inputImage forKey:kCIInputImageKey]; if (![name isEqualToString:@&quot;CIMedianFilter&quot;]) { [filter setValue:@(radius) forKey:@&quot;inputRadius&quot;]; } CIImage *result = [filter valueForKey:kCIOutputImageKey]; CGImageRef cgImage = [context createCGImage:result fromRect:[result extent]]; UIImage *resultImage = [UIImage imageWithCGImage:cgImage]; CGImageRelease(cgImage); return resultImage; }else{ return nil; } }</textarea>

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#pragma mark - 对图片进行模糊处理 // CIGaussianBlur ---> 高斯模糊 // CIBoxBlur      ---> 均值模糊(Available in iOS 9.0 and later) // CIDiscBlur     ---> 环形卷积模糊(Available in iOS 9.0 and later) // CIMedianFilter ---> 中值模糊, 用于消除图像噪点, 无需设置radius(Available in iOS 9.0 and later) // CIMotionBlur   ---> 运动模糊, 用于模拟相机移动拍摄时的扫尾效果(Available in iOS 9.0 and later) + ( UIImage * ) blurWithOriginalImage : ( UIImage * ) image blurName : ( NSString * ) name radius : ( NSInteger ) radius {      CIContext *context = [ CIContext contextWithOptions :nil ] ;      CIImage *inputImage = [ [ CIImage alloc ] initWithImage :image ] ;      CIFilter *filter ;      if ( name . length != 0 ) {          filter = [ CIFilter filterWithName :name ] ;          [ filter setValue :inputImage forKey :kCIInputImageKey ] ;          if ( ! [ name isEqualToString : @"CIMedianFilter" ] ) {              [ filter setValue : @ ( radius ) forKey : @"inputRadius" ] ;          }          CIImage *result = [ filter valueForKey :kCIOutputImageKey ] ;          CGImageRef cgImage = [ context createCGImage :result fromRect : [ result extent ] ] ;          UIImage *resultImage = [ UIImage imageWithCGImage :cgImage ] ;          CGImageRelease ( cgImage ) ;          return resultImage ;      } else {          return nil ;      } }

14. 调整图片饱和度、亮度、对比度

<textarea class="crayon-plain print-no" data-settings="dblclick" readonly="readonly" style="-moz-tab-size: 4; font-size: 13px ! important; line-height: 15px ! important; z-index: 0; opacity: 0;" wrap="soft">/** * 调整图片饱和度, 亮度, 对比度 * * @param image 目标图片 * @param saturation 饱和度 * @param brightness 亮度: -1.0 ~ 1.0 * @param contrast 对比度 * */ + (UIImage *)colorControlsWithOriginalImage:(UIImage *)image saturation:(CGFloat)saturation brightness:(CGFloat)brightness contrast:(CGFloat)contrast{ CIContext *context = [CIContext contextWithOptions:nil]; CIImage *inputImage = [[CIImage alloc] initWithImage:image]; CIFilter *filter = [CIFilter filterWithName:@&quot;CIColorControls&quot;]; [filter setValue:inputImage forKey:kCIInputImageKey]; [filter setValue:@(saturation) forKey:@&quot;inputSaturation&quot;]; [filter setValue:@(brightness) forKey:@&quot;inputBrightness&quot;]; [filter setValue:@(contrast) forKey:@&quot;inputContrast&quot;]; CIImage *result = [filter valueForKey:kCIOutputImageKey]; CGImageRef cgImage = [context createCGImage:result fromRect:[result extent]]; UIImage *resultImage = [UIImage imageWithCGImage:cgImage]; CGImageRelease(cgImage); return resultImage; }</textarea>

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/** *  调整图片饱和度, 亮度, 对比度 * *  @param image      目标图片 *  @param saturation 饱和度 *  @param brightness 亮度: -1.0 ~ 1.0 *  @param contrast   对比度 * */ + ( UIImage * ) colorControlsWithOriginalImage : ( UIImage * ) image                                  saturation : ( CGFloat ) saturation                                  brightness : ( CGFloat ) brightness                                    contrast : ( CGFloat ) contrast {      CIContext *context = [ CIContext contextWithOptions :nil ] ;      CIImage *inputImage = [ [ CIImage alloc ] initWithImage :image ] ;      CIFilter *filter = [ CIFilter filterWithName : @"CIColorControls" ] ;      [ filter setValue :inputImage forKey :kCIInputImageKey ] ;        [ filter setValue : @ ( saturation ) forKey : @"inputSaturation" ] ;      [ filter setValue : @ ( brightness ) forKey : @"inputBrightness" ] ;      [ filter setValue : @ ( contrast ) forKey : @"inputContrast" ] ;        CIImage *result = [ filter valueForKey :kCIOutputImageKey ] ;      CGImageRef cgImage = [ context createCGImage :result fromRect : [ result extent ] ] ;      UIImage *resultImage = [ UIImage imageWithCGImage :cgImage ] ;      CGImageRelease ( cgImage ) ;      return resultImage ; }

15. 创建一张实时模糊效果 View (毛玻璃效果)

<textarea class="crayon-plain print-no" data-settings="dblclick" readonly="readonly" style="-moz-tab-size: 4; font-size: 13px ! important; line-height: 15px ! important; z-index: 0; opacity: 0;" wrap="soft">//Avilable in iOS 8.0 and later + (UIVisualEffectView *)effectViewWithFrame:(CGRect)frame{ UIBlurEffect *effect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight]; UIVisualEffectView *effectView = [[UIVisualEffectView alloc] initWithEffect:effect]; effectView.frame = frame; return effectView; }</textarea>

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//Avilable in iOS 8.0 and later + ( UIVisualEffectView * ) effectViewWithFrame : ( CGRect ) frame {      UIBlurEffect *effect = [ UIBlurEffect effectWithStyle :UIBlurEffectStyleLight ] ;      UIVisualEffectView *effectView = [ [ UIVisualEffectView alloc ] initWithEffect :effect ] ;      effectView . frame = frame ;      return effectView ; }

16. 全屏截图

<textarea class="crayon-plain print-no" data-settings="dblclick" readonly="readonly" style="-moz-tab-size: 4; font-size: 13px ! important; line-height: 15px ! important; z-index: 0; opacity: 0;" wrap="soft">//全屏截图 + (UIImage *)shotScreen{ UIWindow *window = [UIApplication sharedApplication].keyWindow; UIGraphicsBeginImageContext(window.bounds.size); [window.layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return image; }</textarea>

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//全屏截图 + ( UIImage * ) shotScreen {      UIWindow *window = [ UIApplication sharedApplication ] . keyWindow ;      UIGraphicsBeginImageContext ( window . bounds . size ) ;      [ window . layer renderInContext :UIGraphicsGetCurrentContext ( ) ] ;      UIImage *image = UIGraphicsGetImageFromCurrentImageContext ( ) ;      UIGraphicsEndImageContext ( ) ;      return image ; }

17. 截取一张 view 生成图片

<textarea class="crayon-plain print-no" data-settings="dblclick" readonly="readonly" style="-moz-tab-size: 4; font-size: 13px ! important; line-height: 15px ! important; z-index: 0; opacity: 0;" wrap="soft">//截取view生成一张图片 + (UIImage *)shotWithView:(UIView *)view{ UIGraphicsBeginImageContext(view.bounds.size); [view.layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return image; }</textarea>

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//截取view生成一张图片 + ( UIImage * ) shotWithView : ( UIView * ) view {      UIGraphicsBeginImageContext ( view . bounds . size ) ;      [ view . layer renderInContext :UIGraphicsGetCurrentContext ( ) ] ;      UIImage *image = UIGraphicsGetImageFromCurrentImageContext ( ) ;      UIGraphicsEndImageContext ( ) ;      return image ; }

18. 截取view中某个区域生成一张图片

<textarea class="crayon-plain print-no" data-settings="dblclick" readonly="readonly" style="-moz-tab-size: 4; font-size: 13px ! important; line-height: 15px ! important; z-index: 0; opacity: 0;" wrap="soft">//截取view中某个区域生成一张图片 + (UIImage *)shotWithView:(UIView *)view scope:(CGRect)scope{ CGImageRef imageRef = CGImageCreateWithImageInRect([self shotWithView:view].CGImage, scope); UIGraphicsBeginImageContext(scope.size); CGContextRef context = UIGraphicsGetCurrentContext(); CGRect rect = CGRectMake(0, 0, scope.size.width, scope.size.height); CGContextTranslateCTM(context, 0, rect.size.height);//下移 CGContextScaleCTM(context, 1.0f, -1.0f);//上翻 CGContextDrawImage(context, rect, imageRef); UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); CGImageRelease(imageRef); CGContextRelease(context); return image; }</textarea>

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//截取view中某个区域生成一张图片 + ( UIImage * ) shotWithView : ( UIView * ) view scope : ( CGRect ) scope {      CGImageRef imageRef = CGImageCreateWithImageInRect ( [ self shotWithView :view ] . CGImage , scope ) ;      UIGraphicsBeginImageContext ( scope . size ) ;      CGContextRef context = UIGraphicsGetCurrentContext ( ) ;      CGRect rect = CGRectMake ( 0 , 0 , scope . size . width , scope . size . height ) ;      CGContextTranslateCTM ( context , 0 , rect . size . height ) ; //下移      CGContextScaleCTM ( context , 1.0f , - 1.0f ) ; //上翻      CGContextDrawImage ( context , rect , imageRef ) ;      UIImage *image = UIGraphicsGetImageFromCurrentImageContext ( ) ;      UIGraphicsEndImageContext ( ) ;      CGImageRelease ( imageRef ) ;      CGContextRelease ( context ) ;      return image ; }

19. 压缩图片到指定尺寸大小

<textarea class="crayon-plain print-no" data-settings="dblclick" readonly="readonly" style="-moz-tab-size: 4; font-size: 13px ! important; line-height: 15px ! important; z-index: 0; opacity: 0;" wrap="soft">//压缩图片到指定尺寸大小 + (UIImage *)compressOriginalImage:(UIImage *)image toSize:(CGSize)size{ UIImage *resultImage = image; UIGraphicsBeginImageContext(size); [resultImage drawInRect:CGRectMake(0, 0, size.width, size.height)]; UIGraphicsEndImageContext(); return resultImage; }</textarea>

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//压缩图片到指定尺寸大小 + ( UIImage * ) compressOriginalImage : ( UIImage * ) image toSize : ( CGSize ) size {      UIImage *resultImage = image ;      UIGraphicsBeginImageContext ( size ) ;      [ resultImage drawInRect :CGRectMake ( 0 , 0 , size . width , size . height ) ] ;      UIGraphicsEndImageContext ( ) ;      return resultImage ; }

20. 压缩图片到指定文件大小

<textarea class="crayon-plain print-no" data-settings="dblclick" readonly="readonly" style="-moz-tab-size: 4; font-size: 13px ! important; line-height: 15px ! important; z-index: 0; opacity: 0;" wrap="soft">//压缩图片到指定文件大小 + (NSData *)compressOriginalImage:(UIImage *)image toMaxDataSizeKBytes:(CGFloat)size{ NSData *data = UIImageJPEGRepresentation(image, 1.0); CGFloat dataKBytes = data.length/1000.0; CGFloat maxQuality = 0.9f; CGFloat lastData = dataKBytes; while (dataKBytes &gt; size &amp;&amp; maxQuality &gt; 0.01f) { maxQuality = maxQuality - 0.01f; data = UIImageJPEGRepresentation(image, maxQuality); dataKBytes = data.length/1000.0; if (lastData == dataKBytes) { break; }else{ lastData = dataKBytes; } } return data; }</textarea>

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//压缩图片到指定文件大小 + ( NSData * ) compressOriginalImage : ( UIImage * ) image toMaxDataSizeKBytes : ( CGFloat ) size {      NSData *data = UIImageJPEGRepresentation ( image , 1.0 ) ;      CGFloat dataKBytes = data . length / 1000.0 ;      CGFloat maxQuality = 0.9f ;      CGFloat lastData = dataKBytes ;      while ( dataKBytes > size && maxQuality > 0.01f ) {          maxQuality = maxQuality - 0.01f ;          data = UIImageJPEGRepresentation ( image , maxQuality ) ;          dataKBytes = data . length / 1000.0 ;          if ( lastData == dataKBytes ) {              break ;          } else {              lastData = dataKBytes ;          }      }      return data ; }

21. 获取设备 IP 地址

需要先引入下头文件:

<textarea class="crayon-plain print-no" data-settings="dblclick" readonly="readonly" style="-moz-tab-size: 4; font-size: 13px ! important; line-height: 15px ! important; z-index: 0; opacity: 0;" wrap="soft">#import &lt;ifaddrs.h&gt; #import &lt;arpa/inet.h&gt;</textarea>

1 2	#import <ifaddrs.h> #import <arpa/inet.h>

代码:

<textarea class="crayon-plain print-no" data-settings="dblclick" readonly="readonly" style="-moz-tab-size: 4; font-size: 13px ! important; line-height: 15px ! important; z-index: 0; opacity: 0;" wrap="soft">//获取设备 IP 地址 + (NSString *)getIPAddress { NSString *address = @&quot;error&quot;; struct ifaddrs *interfaces = NULL; struct ifaddrs *temp_addr = NULL; int success = 0; success = getifaddrs(&amp;interfaces); if (success == 0) { temp_addr = interfaces; while(temp_addr != NULL) { if(temp_addr-&gt;ifa_addr-&gt;sa_family == AF_INET) { if([[NSString stringWithUTF8String:temp_addr-&gt;ifa_name] isEqualToString:@&quot;en0&quot;]) { address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr-&gt;ifa_addr)-&gt;sin_addr)]; } } temp_addr = temp_addr-&gt;ifa_next; } } freeifaddrs(interfaces); return address; }</textarea>

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//获取设备 IP 地址 + ( NSString * ) getIPAddress {      NSString *address = @"error" ;      struct ifaddrs *interfaces = NULL ;      struct ifaddrs *temp_addr = NULL ;      int success = 0 ;      success = getifaddrs ( & interfaces ) ;      if ( success == 0 ) {          temp_addr = interfaces ;          while ( temp_addr != NULL ) {              if ( temp_addr -> ifa_addr -> sa_family == AF_INET ) {                  if ( [ [ NSString stringWithUTF8String :temp_addr -> ifa_name ] isEqualToString : @"en0" ] ) {                      address = [ NSString stringWithUTF8String :inet_ntoa ( ( ( struct sockaddr_in * ) temp_addr -> ifa_addr ) -> sin_addr ) ] ;                  }              }              temp_addr = temp_addr -> ifa_next ;          }      }      freeifaddrs ( interfaces ) ;      return address ; }

22. 判断字符串中是否含有空格

<textarea class="crayon-plain print-no" data-settings="dblclick" readonly="readonly" style="-moz-tab-size: 4; font-size: 13px ! important; line-height: 15px ! important; z-index: 0; opacity: 0;" wrap="soft">+ (BOOL)isHaveSpaceInString:(NSString *)string{ NSRange _range = [string rangeOfString:@&quot; &quot;]; if (_range.location != NSNotFound) { return YES; }else { return NO; } }</textarea>

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+ ( BOOL ) isHaveSpaceInString : ( NSString * ) string {      NSRange _range = [ string rangeOfString : @" " ] ;      if ( _range . location != NSNotFound ) {          return YES ;      } else {          return NO ;      } }

23. 判断字符串中是否含有某个字符串

<textarea class="crayon-plain print-no" data-settings="dblclick" readonly="readonly" style="-moz-tab-size: 4; font-size: 13px ! important; line-height: 15px ! important; z-index: 0; opacity: 0;" wrap="soft">+ (BOOL)isHaveString:(NSString *)string1 InString:(NSString *)string2{ NSRange _range = [string2 rangeOfString:string1]; if (_range.location != NSNotFound) { return YES; }else { return NO; } }</textarea>

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+ ( BOOL ) isHaveString : ( NSString * ) string1 InString : ( NSString * ) string2 {      NSRange _range = [ string2 rangeOfString :string1 ] ;      if ( _range . location != NSNotFound ) {          return YES ;      } else {          return NO ;      } }

24. 判断字符串中是否含有中文

<textarea class="crayon-plain print-no" data-settings="dblclick" readonly="readonly" style="-moz-tab-size: 4; font-size: 13px ! important; line-height: 15px ! important; z-index: 0; opacity: 0;" wrap="soft">+ (BOOL)isHaveChineseInString:(NSString *)string{ for(NSInteger i = 0; i &lt; [string length]; i++){ int a = [string characterAtIndex:i]; if (a &gt; 0x4e00 &amp;&amp; a &lt; 0x9fff) { return YES; } } return NO; }</textarea>

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+ ( BOOL ) isHaveChineseInString : ( NSString * ) string {      for ( NSInteger i = 0 ; i < [ string length ] ; i ++ ) {          int a = [ string characterAtIndex :i ] ;          if ( a > 0x4e00 && a < 0x9fff ) {              return YES ;          }      }      return NO ; }

25. 判断字符串是否全部为数字

<textarea class="crayon-plain print-no" data-settings="dblclick" readonly="readonly" style="-moz-tab-size: 4; font-size: 13px ! important; line-height: 15px ! important; z-index: 0; opacity: 0;" wrap="soft">+ (BOOL)isAllNum:(NSString *)string{ unichar c; for (int i=0; i&lt;string.length; i++) { c=[string characterAtIndex:i]; if (!isdigit(c)) { return NO; } } return YES; }</textarea>

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+ ( BOOL ) isAllNum : ( NSString * ) string {      unichar c ;      for ( int i = 0 ; i < string . length ; i ++ ) {          c = [ string characterAtIndex :i ] ;          if ( ! isdigit ( c ) ) {              return NO ;          }      }      return YES ; }

26. 绘制虚线

<textarea class="crayon-plain print-no" data-settings="dblclick" readonly="readonly" style="-moz-tab-size: 4; font-size: 13px ! important; line-height: 15px ! important; z-index: 0; opacity: 0;" wrap="soft">/* ** lineFrame: 虚线的 frame ** length: 虚线中短线的宽度 ** spacing: 虚线中短线之间的间距 ** color: 虚线中短线的颜色 */ + (UIView *)createDashedLineWithFrame:(CGRect)lineFrame lineLength:(int)length lineSpacing:(int)spacing lineColor:(UIColor *)color{ UIView *dashedLine = [[UIView alloc] initWithFrame:lineFrame]; dashedLine.backgroundColor = [UIColor clearColor]; CAShapeLayer *shapeLayer = [CAShapeLayer layer]; [shapeLayer setBounds:dashedLine.bounds]; [shapeLayer setPosition:CGPointMake(CGRectGetWidth(dashedLine.frame) / 2, CGRectGetHeight(dashedLine.frame))]; [shapeLayer setFillColor:[UIColor clearColor].CGColor]; [shapeLayer setStrokeColor:color.CGColor]; [shapeLayer setLineWidth:CGRectGetHeight(dashedLine.frame)]; [shapeLayer setLineJoin:kCALineJoinRound]; [shapeLayer setLineDashPattern:[NSArray arrayWithObjects:[NSNumber numberWithInt:length], [NSNumber numberWithInt:spacing], nil]]; CGMutablePathRef path = CGPathCreateMutable(); CGPathMoveToPoint(path, NULL, 0, 0); CGPathAddLineToPoint(path, NULL, CGRectGetWidth(dashedLine.frame), 0); [shapeLayer setPath:path]; CGPathRelease(path); [dashedLine.layer addSublayer:shapeLayer]; return da</textarea>

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/*   ** lineFrame:     虚线的 frame   ** length:        虚线中短线的宽度   ** spacing:       虚线中短线之间的间距   ** color:         虚线中短线的颜色 */ + ( UIView * ) createDashedLineWithFrame : ( CGRect ) lineFrame                            lineLength : ( int ) length                           lineSpacing : ( int ) spacing                             lineColor : ( UIColor * ) color {      UIView *dashedLine = [ [ UIView alloc ] initWithFrame :lineFrame ] ;      dashedLine . backgroundColor = [ UIColor clearColor ] ;      CAShapeLayer *shapeLayer = [ CAShapeLayer layer ] ;      [ shapeLayer setBounds :dashedLine . bounds ] ;      [ shapeLayer setPosition :CGPointMake ( CGRectGetWidth ( dashedLine . frame ) / 2 , CGRectGetHeight ( dashedLine . frame ) ) ] ;      [ shapeLayer setFillColor : [ UIColor clearColor ] . CGColor ] ;      [ shapeLayer setStrokeColor :color . CGColor ] ;      [ shapeLayer setLineWidth :CGRectGetHeight ( dashedLine . frame ) ] ;      [ shapeLayer setLineJoin :kCALineJoinRound ] ;      [ shapeLayer setLineDashPattern : [ NSArray arrayWithObjects : [ NSNumber numberWithInt :length ] , [ NSNumber numberWithInt :spacing ] , nil ] ] ;      CGMutablePathRef path = CGPathCreateMutable ( ) ;      CGPathMoveToPoint ( path , NULL , 0 , 0 ) ;      CGPathAddLineToPoint ( path , NULL , CGRectGetWidth ( dashedLine . frame ) , 0 ) ;      [ shapeLayer setPath :path ] ;      CGPathRelease ( path ) ;      [ dashedLine . layer addSublayer :shapeLayer ] ;      return dashedLine ; }