Objective-c之NSString+NSMutableString+NSValue+NSAraay用法汇总

string dictionary whitespace character newline path

 NSString+NSMutableString+NSValue+NSAraay用法汇总

 /*******************************************************************************************
      NSString
      *******************************************************************************************/
     //一、NSString
     /*----------------创建字符串的方法----------------*/
      deviceToken 转成字符串：
     NSString *token = [[deviceToken description] stringByTrimmingCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@"<>"]];     printf("My Token is %s \n",[token UTF8String]);     pushToken = [token UTF8String];

     //1、创建常量字符串。
     NSString *astring = @"This is a String!";


     //2、创建空字符串，给予赋值。

     NSString *astring = [[NSString alloc] init];
     astring = @"This is a String!";
     NSLog(@"astring:%@",astring);
   [astring release];



     //3、在以上方法中，提升速度:initWithString方法

     NSString *astring = [[NSString alloc] initWithString:@"This is a String!"];
     NSLog(@"astring:%@",astring);
     [astring release];



     //4、用标准c创建字符串:initWithCString方法

     char *Cstring = "This is a String!";
     NSString *astring = [[NSString alloc] initWithCString:Cstring];
     NSLog(@"astring:%@",astring);
     [astring release];



     //5、创建格式化字符串:占位符（由一个%加一个字符组成）

     int i = 1;
     int j = 2;
     NSString *astring = [[NSString alloc] initWithString:[NSString stringWithFormat:@"%d.This is %i string!",i,j]];
     NSLog(@"astring:%@",astring);
     [astring release];



     //6、创建临时字符串

     NSString *astring;
     astring = [NSString stringWithCString:"This is a temporary string"];
     NSLog(@"astring:%@",astring);




     /*----------------从文件读取字符串:initWithContentsOfFile方法----------------*/

     NSString *path = @"astring.text";
     NSString *astring = [[NSString alloc] initWithContentsOfFile:path];
     NSLog(@"astring:%@",astring);
     [astring release];


     /*----------------写字符串到文件:writeToFile方法----------------*/


     NSString *astring = [[NSString alloc] initWithString:@"This is a String!"];
     NSLog(@"astring:%@",astring);
     NSString *path = @"astring.text";
     [astring writeToFile: path atomically: YES];
     [astring release];




     /*----------------比较两个字符串----------------*/

     //用C比较:strcmp函数

     char string1[] = "string!";
     char string2[] = "string!";
     if(strcmp(string1, string2) = = 0)
     {
         NSLog(@"1");
     }



     //isEqualToString方法
     NSString *astring01 = @"This is a String!";
     NSString *astring02 = @"This is a String!";
     BOOL result = [astring01 isEqualToString:astring02];
     NSLog(@"result:%d",result);




     //compare方法(comparer返回的三种值)
     NSString *astring01 = @"This is a String!";
     NSString *astring02 = @"This is a String!";
     BOOL result = [astring01 compare:astring02] = = NSOrderedSame;
     NSLog(@"result:%d",result);
     //NSOrderedSame判断两者内容是否相同




     NSString *astring01 = @"This is a String!";
     NSString *astring02 = @"this is a String!";
     BOOL result = [astring01 compare:astring02] = = NSOrderedAscending;
     NSLog(@"result:%d",result);
     //NSOrderedAscending判断两对象值的大小(按字母顺序进行比较，astring02大于astring01为真)



     NSString *astring01 = @"this is a String!";
     NSString *astring02 = @"This is a String!";
     BOOL result = [astring01 compare:astring02] = = NSOrderedDescending;
     NSLog(@"result:%d",result);
     //NSOrderedDescending判断两对象值的大小(按字母顺序进行比较，astring02小于astring01为真)



     //不考虑大小写比较字符串1
     NSString *astring01 = @"this is a String!";
     NSString *astring02 = @"This is a String!";
     BOOL result = [astring01 caseInsensitiveCompare:astring02] = = NSOrderedSame;
     NSLog(@"result:%d",result);
     //NSOrderedDescending判断两对象值的大小(按字母顺序进行比较，astring02小于astring01为真)



     //不考虑大小写比较字符串2
     NSString *astring01 = @"this is a String!";
     NSString *astring02 = @"This is a String!";
     BOOL result = [astring01 compare:astring02
                             options:NSCaseInsensitiveSearch | NSNumericSearch] = = NSOrderedSame;
     NSLog(@"result:%d",result);

     //NSCaseInsensitiveSearch:不区分大小写比较 NSLiteralSearch:进行完全比较，区分大小写 NSNumericSearch:比较字符串的字符个数，而不是字符值。


     /*----------------改变字符串的大小写----------------*/

     NSString *string1 = @"A String";
     NSString *string2 = @"String";
     NSLog(@"string1:%@",[string1 uppercaseString]);//大写
     NSLog(@"string2:%@",[string2 lowercaseString]);//小写
     NSLog(@"string2:%@",[string2 capitalizedString]);//首字母大小


     /*----------------在串中搜索子串----------------*/

     NSString *string1 = @"This is a string";
     NSString *string2 = @"string";
     NSRange range = [string1 rangeOfString:string2];
     int location = range.location;
     int leight = range.length;
     NSString *astring = [[NSString alloc] initWithString:[NSString stringWithFormat:@"Location:%i,Leight:%i",location,leight]];
     NSLog(@"astring:%@",astring);
     [astring release];


     /*----------------抽取子串 ----------------*/

     //-substringToIndex: 从字符串的开头一直截取到指定的位置，但不包括该位置的字符
     NSString *string1 = @"This is a string";
     NSString *string2 = [string1 substringToIndex:3];
     NSLog(@"string2:%@",string2);




     //-substringFromIndex: 以指定位置开始（包括指定位置的字符），并包括之后的全部字符
     NSString *string1 = @"This is a string";
     NSString *string2 = [string1 substringFromIndex:3];
     NSLog(@"string2:%@",string2);




     //-substringWithRange: //按照所给出的位置，长度，任意地从字符串中截取子串
     NSString *string1 = @"This is a string";
     NSString *string2 = [string1 substringWithRange:NSMakeRange(0, 4)];
     NSLog(@"string2:%@",string2);


     //扩展路径

     NSString *Path = @"~/NSData.txt";
     NSString *absolutePath = [Path stringByExpandingTildeInPath];
     NSLog(@"absolutePath:%@",absolutePath);
     NSLog(@"Path:%@",[absolutePath stringByAbbreviatingWithTildeInPath]);



     //文件扩展名
     NSString *Path = @"~/NSData.txt";
     NSLog(@"Extension:%@",[Path pathExtension]);




     /*******************************************************************************************
      NSMutableString
      *******************************************************************************************/

     /*---------------给字符串分配容量----------------*/
     //stringWithCapacity:
     NSMutableString *String;
     String = [NSMutableString stringWithCapacity:40];


     /*---------------在已有字符串后面添加字符----------------*/

     //appendString: and appendFormat:

     NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
     //[String1 appendString:@", I will be adding some character"];
     [String1 appendFormat:[NSString stringWithFormat:@", I will be adding some character"]];
     NSLog(@"String1:%@",String1);
     */


     /*--------在已有字符串中按照所给出范围和长度删除字符------*/
     /*
      //deleteCharactersInRange:
      NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
      [String1 deleteCharactersInRange:NSMakeRange(0, 5)];
      NSLog(@"String1:%@",String1);



      /*--------在已有字符串后面在所指定的位置中插入给出的字符串------*/

     //-insertString: atIndex:
     NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
     [String1 insertString:@"Hi! " atIndex:0];
     NSLog(@"String1:%@",String1);



     /*--------将已有的空符串换成其它的字符串------*/

     //-setString:
     NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
     [String1 setString:@"Hello Word!"];
     NSLog(@"String1:%@",String1);



     /*--------按照所给出的范围，和字符串替换的原有的字符------*/

     //-setString:
     NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
     [String1 replaceCharactersInRange:NSMakeRange(0, 4) withString:@"That"];
     NSLog(@"String1:%@",String1);



     /*-------------判断字符串内是否还包含别的字符串(前缀，后缀)-------------*/
     //01：检查字符串是否以另一个字符串开头- (BOOL) hasPrefix: (NSString *) aString;
     NSString *String1 = @"NSStringInformation.txt";
     [String1 hasPrefix:@"NSString"] = = 1 ?  NSLog(@"YES") : NSLog(@"NO");
     [String1 hasSuffix:@".txt"] = = 1 ?  NSLog(@"YES") : NSLog(@"NO");

     //02：查找字符串某处是否包含其它字符串 - (NSRange) rangeOfString: (NSString *) aString，这一点前面在串中搜索子串用到过;



     /*******************************************************************************************
      NSArray
      *******************************************************************************************/

     /*---------------------------创建数组------------------------------*/
     //NSArray *array = [[NSArray alloc] initWithObjects:
     @"One",@"Two",@"Three",@"Four",nil];

     self.dataArray = array;
     [array release];

     //- (unsigned) Count;数组所包含对象个数；
     NSLog(@"self.dataArray cound:%d",[self.dataArray count]);

     //- (id) objectAtIndex: (unsigned int) index;获取指定索引处的对象;
     NSLog(@"self.dataArray cound 2:%@",[self.dataArray objectAtIndex:2]);


     /*--------------------------从一个数组拷贝数据到另一数组(可变数级)----------------------------*/

     //arrayWithArray:
     //NSArray *array1 = [[NSArray alloc] init];
     NSMutableArray *MutableArray = [[NSMutableArray alloc] init];
     NSArray *array = [NSArray arrayWithObjects:
                       @"a",@"b",@"c",nil];
     NSLog(@"array:%@",array);
     MutableArray = [NSMutableArray arrayWithArray:array];
     NSLog(@"MutableArray:%@",MutableArray);

     array1 = [NSArray arrayWithArray:array];
     NSLog(@"array1:%@",array1);


     //Copy

     //id obj;
     NSMutableArray *newArray = [[NSMutableArray alloc] init];
     NSArray *oldArray = [NSArray arrayWithObjects:
                          @"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];

     NSLog(@"oldArray:%@",oldArray);
     for(int i = 0; i < [oldArray count]; i++)
     {
         obj = [[oldArray objectAtIndex:i] copy];
         [newArray addObject: obj];
     }
     //
     NSLog(@"newArray:%@", newArray);
     [newArray release];


     //快速枚举

     //NSMutableArray *newArray = [[NSMutableArray alloc] init];
     NSArray *oldArray = [NSArray arrayWithObjects:
                          @"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];
     NSLog(@"oldArray:%@",oldArray);

     for(id obj in oldArray)
     {
         [newArray addObject: obj];
     }
     //
     NSLog(@"newArray:%@", newArray);
     [newArray release];


     //Deep copy

     //NSMutableArray *newArray = [[NSMutableArray alloc] init];
     NSArray *oldArray = [NSArray arrayWithObjects:
                          @"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];
     NSLog(@"oldArray:%@",oldArray);
     newArray = (NSMutableArray*)CFPropertyListCreateDeepCopy(kCFAllocatorDefault, (CFPropertyListRef)oldArray, kCFPropertyListMutableContainers);
     NSLog(@"newArray:%@", newArray);
     [newArray release];


     //Copy and sort

     //NSMutableArray *newArray = [[NSMutableArray alloc] init];
     NSArray *oldArray = [NSArray arrayWithObjects:
                          @"b",@"a",@"e",@"d",@"c",@"f",@"h",@"g",nil];
     NSLog(@"oldArray:%@",oldArray);
     NSEnumerator *enumerator;
     enumerator = [oldArray objectEnumerator];
     id obj;
     while(obj = [enumerator nextObject])
     {
         [newArray addObject: obj];
     }
     [newArray sortUsingSelector:@selector(compare:)];
     NSLog(@"newArray:%@", newArray);
     [newArray release];



     /*---------------------------切分数组------------------------------*/

     //从字符串分割到数组－ componentsSeparatedByString:
     NSString *string = [[NSString alloc] initWithString:@"One,Two,Three,Four"];
     NSLog(@"string:%@",string);
     NSArray *array = [string componentsSeparatedByString:@","];
     NSLog(@"array:%@",array);
     [string release];


     //从数组合并元素到字符串- componentsJoinedByString:
     NSArray *array = [[NSArray alloc] initWithObjects:@"One",@"Two",@"Three",@"Four",nil];
     NSString *string = [array componentsJoinedByString:@","];
     NSLog(@"string:%@",string);



     /*******************************************************************************************
      NSMutableArray
      *******************************************************************************************/
     /*---------------给数组分配容量----------------*/
     //NSArray *array;
     array = [NSMutableArray arrayWithCapacity:20];



     /*--------------在数组末尾添加对象----------------*/
     //- (void) addObject: (id) anObject;
     //NSMutableArray *array = [NSMutableArray arrayWithObjects:
     @"One",@"Two",@"Three",nil];
     [array addObject:@"Four"];
     NSLog(@"array:%@",array);



     /*--------------删除数组中指定索引处对象----------------*/
     //-(void) removeObjectAtIndex: (unsigned) index;
     //NSMutableArray *array = [NSMutableArray arrayWithObjects:
     @"One",@"Two",@"Three",nil];
     [array removeObjectAtIndex:1];
     NSLog(@"array:%@",array);



     /*-------------数组枚举---------------*/
     //- (NSEnumerator *)objectEnumerator;从前向后
     //NSMutableArray *array = [NSMutableArray arrayWithObjects:
     @"One",@"Two",@"Three",nil];
     NSEnumerator *enumerator;
     enumerator = [array objectEnumerator];

     id thingie;
     while (thingie = [enumerator nextObject]) {
         NSLog(@"thingie:%@",thingie);
     }


     //- (NSEnumerator *)reverseObjectEnumerator;从后向前
     //NSMutableArray *array = [NSMutableArray arrayWithObjects:
     @"One",@"Two",@"Three",nil];
     NSEnumerator *enumerator;
     enumerator = [array reverseObjectEnumerator];

     id object;
     while (object = [enumerator nextObject]) {
         NSLog(@"object:%@",object);
     }


     //快速枚举
     //NSMutableArray *array = [NSMutableArray arrayWithObjects:
     @"One",@"Two",@"Three",nil];
     for(NSString *string in array)
     {
         NSLog(@"string:%@",string);
     }



     /*******************************************************************************************
      NSDictionary
      *******************************************************************************************/

     /*------------------------------------创建字典------------------------------------*/
     //- (id) initWithObjectsAndKeys;

     //NSDictionary *dictionary = [[NSDictionary alloc] initWithObjectsAndKeys:@"One",@"1",@"Two",@"2",@"Three",@"3",nil];
     NSString *string = [dictionary objectForKey:@"One"];
     NSLog(@"string:%@",string);
     NSLog(@"dictionary:%@",dictionary);
     [dictionary release];


     /*******************************************************************************************
      NSMutableDictionary
      *******************************************************************************************/

     /*------------------------------------创建可变字典------------------------------------*/
     //创建
     NSMutableDictionary *dictionary = [NSMutableDictionary dictionary];

     //添加字典
     [dictionary setObject:@"One" forKey:@"1"];
     [dictionary setObject:@"Two" forKey:@"2"];
     [dictionary setObject:@"Three" forKey:@"3"];
     [dictionary setObject:@"Four" forKey:@"4"];
     NSLog(@"dictionary:%@",dictionary);

     //删除指定的字典
     [dictionary removeObjectForKey:@"3"];
     NSLog(@"dictionary:%@",dictionary);


     /*******************************************************************************************
      NSValue（对任何对象进行包装）
      *******************************************************************************************/

     /*--------------------------------将NSRect放入NSArray中------------------------------------*/
     //将NSRect放入NSArray中
     NSMutableArray *array = [[NSMutableArray alloc] init];
     NSValue *value;
     CGRect rect = CGRectMake(0, 0, 320, 480);
     value = [NSValue valueWithBytes:&rect objCType:@encode(CGRect)];
     [array addObject:value];
     NSLog(@"array:%@",array);

     //从Array中提取
     value = [array objectAtIndex:0];
     [value getValue:&rect];
     NSLog(@"value:%@",value);


     /*******************************************************************************************
      从目录搜索扩展名为jpg的文件
      *******************************************************************************************/

     //NSFileManager *fileManager = [NSFileManager defaultManager];
     NSString *home;
     home = @"../Users/";

     NSDirectoryEnumerator *direnum;
     direnum = [fileManager enumeratorAtPath: home];

     NSMutableArray *files = [[NSMutableArray alloc] init];

     //枚举
     NSString *filename;
     while (filename = [direnum nextObject]) {
         if([[filename pathExtension] hasSuffix:@"jpg"]){
             [files addObject:filename];
         }
     }

     //快速枚举
     //for(NSString *filename in direnum)
     //{
     //    if([[filename pathExtension] isEqualToString:@"jpg"]){
     //        [files addObject:filename];
     //    }
     //}
     NSLog(@"files:%@",files);

     //枚举
     NSEnumerator *filenum;
     filenum = [files objectEnumerator];
     while (filename = [filenum nextObject]) {
         NSLog(@"filename:%@",filename);
   }


 去除username中的空格，table newline，nextline
 代码如下：（三行代码）

 NSCharacterSet *whitespace = [NSCharacterSet whitespaceAndNewlineCharacterSet];

 NSString *username = [mUsernameField stringValue];

 username = [username stringByTrimmingCharactersInSet:whitespace];





 注释：

 stringByTrimmingCharactersInSet:
 Returns a new string made by removing from both ends of the receiver characters contained in a given character set.

 whitespaceAndNewlineCharacterSet
 Returns a character set containing only the whitespace characters space (U+0020) and tab (U+0009) and the newline and nextline characters (U+000A–U+000D, U+0085).

 另外可以用whitespaceCharacterSet 替 换whitespaceAndNewlineCharacterSet 区 别newline nextline
 whitespaceCharacterSet
 Returns a character set containing only the in-line whitespace characters space (U+0020) and tab (U+0009).