1. //该的首字附 大写
NSString *ns22=[[NSString alloc]initWithFormat:@"dsf"];
NSLog(@"%@",[ns22 capitalizedString]);
2. //替换某一指定的字符串
NSMutableString *strs=[[NSMutableString alloc]initWithFormat:@"1257873"];
[strs replaceCharactersInRange:NSMakeRange(0,3) withString:@"dsf"];
NSLog(@"%@",strs );
3. //拼接字符串
NSMutableString *strs=[[NSMutableString alloc]initWithFormat:@"1257873"];
NSString * nss=[strs stringByAppendingString:@"ssss"];
NSLog(@"%@",nss);
4. //替换某一指定的字符串
[strs replaceCharactersInRange:NSMakeRange(0,3) withString:@"dsf"];
NSLog(@"%@",strs );
5. //该的首字附 大写
// NSString *ns22=[[NSString alloc]initWithFormat:@"dsf"];
// NSLog(@"%@",[ns22 capitalizedString]);
6. //往数组中插入 元素
NSNumber *nsn=[[NSNumber alloc]initWithInt:236];
NSNumber *nsn2=[[NSNumber alloc]initWithInt:987];
NSMutableArray * array=[[NSMutableArray alloc]initWithObjects:nsn, nil];
[array insertObject:nsn2 atIndex:0];//插入元素
//快速遍历 数组额数据类型是同一类型 必须 如果是数字 NSNumber NSString改为NSNumber就Ok for(NSString * str in array)
{
NSLog(@"===%@",str);
}
NSLog(@"字符串处理");
//获得字符串长度
NSString* str1=@"MAC OS Pro";
NSLog(@"长度是 %d",[str1 length]);
//两个字符串连接
NSString* str2=@"MAC OS Pro";
NSString* str3=@" Leopard";
NSString* str4=[str2 stringByAppendingString:str3];
NSLog(str4,nil);
NSString* str5=[str2 stringByAppendingFormat:@" %d",10];
NSLog(str5,nil);
//可修改字符串
NSMutableString* string=[NSMutableString string];
[string appendString:@"Mac"];
[string appendString:@" OS"];
[string appendString:@" X"];
NSLog(string,nil);
//插入字符串
NSMutableString* string1=[NSMutableString stringWithFormat:@"Mac X"];
[string1 insertString:@"OS " atIndex:4];
NSLog(string1,nil);
//删除字符串
NSMutableString* string2=[NSMutableString stringWithFormat:@"删除字符串"];
[string2 deleteCharactersInRange:NSMakeRange(0, 2)];
NSLog(string2,nil);
//字符串比较
BOOL result;
result=[string isEqualToString:string1];
NSLog(@"%d",result,nil);
//比较前置串与后置串
NSString* string3=@"Mac Pro";
NSString* string4=@"Mac OS";
//判断是否以Mac开头
result=[string3 hasPrefix:@"Mac"];
NSLog(@"%d",result,nil);
//判断是否以OS结尾
result=[string4 hasSuffix:@"OS"];
NSLog(@"%d",result,nil);
NSString* string5=@"This is Mac OS X";
//检索字符串
NSRange range;
range=[string5 rangeOfString:@"Mac OS"];
if (range.location!=NSNotFound)
{
//得到字符串的位置和长度
NSLog(@"%d,%d",range.location,range.length);
}
else
{
NSLog(@"没有发现",nil);
}
//抽取部分字符串
NSString* string6=@"This is Mac OS X";
NSString *nstr1,*nstr2,*nstr3;
//从开头抽取字符串
nstr1=[string6 substringToIndex:4];
NSLog(nstr1,nil);
//抽取末位位置的字符串
nstr2=[string6 substringFromIndex:8];
NSLog(nstr2,nil);
//抽取指定范围的字符串
nstr3=[string6 substringWithRange:NSMakeRange(5,2)];
NSLog(nstr3,nil);
//结果
2011-10-20 14:05:43.940 StringProcessing[1870:1307] 字符串处理
2011-10-20 14:05:43.942 StringProcessing[1870:1307] 长度是 10
2011-10-20 14:05:43.943 StringProcessing[1870:1307] MAC OS Pro Leopard
2011-10-20 14:05:43.943 StringProcessing[1870:1307] MAC OS Pro 10
2011-10-20 14:05:43.944 StringProcessing[1870:1307] Mac OS X
2011-10-20 14:05:43.945 StringProcessing[1870:1307] Mac OS X
2011-10-20 14:05:43.945 StringProcessing[1870:1307] 字符串
2011-10-20 14:05:43.946 StringProcessing[1870:1307] 1
2011-10-20 14:05:43.946 StringProcessing[1870:1307] 1
2011-10-20 14:05:43.947 StringProcessing[1870:1307] 1
2011-10-20 14:05:43.947 StringProcessing[1870:1307] 8,6
2011-10-20 14:05:43.948 StringProcessing[1870:1307] This
2011-10-20 14:05:43.948 StringProcessing[1870:1307] Mac OS X
2011-10-20 14:05:43.949 StringProcessing[1870:1307] is
以备用到的时候查看
1.定义一个字符串a, 截取a 的某一个部分，复制给b, b必须是int型
NSString *a = @"1.2.30";
int b= [[a substringWithRange:NSMakeRange(4,2)] intValue];
NSLog(@"a:%@ \n",a );
NSLog(@"b:%d",b );
解析如下：substringWithRange: 专门截取字符串的一块肉
NSMakeRange(4,2) 从第4个字符开始截取，长度为2个字符，（字符串都是从第0个字符开始数的哦～！）
b = [a intValue]; 将 a 转换为 整数型
b = [a floatValue]; 将 a 转换为 小数型
b = [a boolValue]; 将 a 转换为 布尔型（true / false）
b = [a integerValue]; 将 a 转换为 整数型
b = [a longLongValue]; 将 a 转换为 长整型
2.字符串截取到第n位 （substringToIndex: n）(第n 位不算再内)
- (void)viewDidLoad
{
NSString *a = @"i like long dress";
NSString *b = [a substringToIndex:4];
NSLog(@"\n b: %@",b);
}
3.字符串从第n 位开始截取,直到最后 （substringFromIndex:n）（包括第 n 位）
- (void)viewDidLoad
{
NSString *a = @"i like long dress";
NSString*b = [a substringFromIndex:4];
NSLog(@"\n b: %@",b);
}
4.从某一个字符串中的一个字符串开始截取
- (void)viewDidLoad
{
NSString *a ="/pubic/evdaily.nsf/vwtrymaindocid/8E88469482579180035442A/$file/测试帐号及信息22.docx";
NSRange range = [arangeOfString:@"$file/"];//获取$file/的位置
NSString *b = [a substringFromIndex:range.location +
range.length];//开始截取
NSLog(@"\n b: %@",b);
}
Object C] 字符串和数组NSString NSArray操作
1
//创建字符串对象数组
NSArray *array = [str componentsSeparatedByString:@"@"];//就是以@为标示 输出看看啦
int count=[array count];
int i;
for(i=0;i<count;i=i+4)
{
printf("%i: %s\n",i,[[array objectAtIndex:i] UTF8String]);
}
2 可变的字符串类
NSMutableString *song=[[NSMutableString alloc] init];
[song appendString:@"Deaf Leppard"];
printf("%s\n",[song UTF8String]);
NSRange range=[song rangeOfString:@"Deaf"];//获取字符串"Deaf"字串的范围
[song replaceCharactersInRange:range withString:@"Def"];//替换
printf("%s\n",[song UTF8String]);
[song insertString:@"Animal by " atIndex:0];
printf("%s\n",[song UTF8String]);
[song release];
3
字典加数组操作
NSArray *keys=[@"one two three" componentsSeparatedByString:@" "];
NSArray *value=[@"two bravo a" componentsSeparatedByString:@" "];
NSDictionary *dic=[[NSDictionary alloc] initWithObjects:value forKeys:keys];
printf("%s\n",[[dic description] UTF8String]);
//一、NSString
//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!";
[astring release];
NSLog(@"astring:%@",astring);
//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);
NSString *path = @"astring.text";
NSString *astring = [[NSString alloc] initWithContentsOfFile:path];
NSLog(@"astring:%@",astring);
[astring release];
NSString *astring = [[NSString alloc] initWithString:@"This is a String!"];
NSLog(@"astring:%@",astring);
NSString *path = @"astring.text";
[astring writeToFile: path atomically: YES];
[astring release];
//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。
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
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];
//-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]);
//stringWithCapacity:
NSMutableString *String;
String = [NSMutableString stringWithCapacity:40];
//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);
*/
//-insertString: atIndex:
NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
[String1 insertString:@"Hi! " atIndex:0];
NSLog(@"String1:%@",String1);
//-setString:
NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
[String1 setString:@"Hello Word!"];
NSLog(@"String1:%@",String1);
//-setString:
NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
[String1 replaceCharactersInRange:NSMakeRange(0, 4) withString:@"That"];
NSLog(@"String1:%@",String1);
//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 *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]);
//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];
//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);
NSArray *array;
array = [NSMutableArray arrayWithCapacity:20];
//- (void) addObject: (id) anObject;
NSMutableArray *array = [NSMutableArray arrayWithObjects:
@"One",@"Two",@"Three",nil];
[array addObject:@"Four"];
NSLog(@"array:%@",array);
//-(void) removeObjectAtIndex: (unsigned) index;
NSMutableArray *array = [NSMutableArray arrayWithObjects:
@"One",@"Two",@"Three",nil];
[array removeObjectAtIndex:1];
NSLog(@"array:%@",array);
//- (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);
}
//- (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];
//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);
//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);
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);
}
//快速枚举
//for(id object in files)
//{
// NSLog(@"object:%@",object);
//}
NSLog(@"数组");
//指定多个字符串创建数组
NSArray *array;
array=[NSArrayarrayWithObjects:@"0-asd",@"1-fds",@"2-哈咯",@"3-个人",nil];
//数组的长度
NSLog(@"数组长度%d",array.count);
//通过索引取得对象
for(int i=0;i<array.count;i++)
{
NSString *secondStr=[arrayobjectAtIndex:i];
NSLog(secondStr,nil);
}
//高速枚举法取得对象,Objective-C2.0开始支持，
for(NSString *strin array)
{
NSLog(str,nil);
}
//对象的追加于删除
//创建空数组
NSMutableArray *MutArray=[NSMutableArrayarray];
//追加对象
[MutArrayaddObject:@"A"];
[MutArrayaddObjectsFromArray:array];
//插入对象
NSString *thstr=@"插入值";
[MutArrayinsertObject:thstr atIndex:4];
//替换对象
[MutArrayreplaceObjectAtIndex:2withObject:@"替换"];
//删除所有对象
//[Mutarray removeAllObjects];
//删除最后的对象
[MutArrayremoveLastObject];
//删除索引为Index的对象
[MutArrayremoveObjectAtIndex:0];
//删除所有于object同值的对象
[MutArrayremoveObject:@"0-asd"];
//删除数组中所有与object等价的对象
[MutArrayremoveObjectIdenticalTo:thstr];
//删除数组中所有与数组array包含相同的元素
[MutArrayremoveObjectsInArray:array];
NSLog(@"%@",MutArray);
