iphone 的NSString NSMutableString的用法



1、初始化字符串一 

[[NSString alloc] initWithFormat:@"%d",10];  

 

2、初始化字符串二

[[NSString alloc] initWithCString:@"字符串内容"]  

 

3、字符串的替换

注:将字符串中的参数进行替换

参数1:目标替换值

参数2:替换成为的值

参数3:类型为默认:NSLiteralSearch

参数4:替换的范围

[str replaceOccurrencesOfString:@"1" withString:@"222" options:NSLiteralSearch range:NSMakeRange(0, [str length])];  

 

4、给字符串分配容量

  NSMutableString *String;
  String = [NSMutableString stringWithCapacity:40];
 

 

5、追加字符串

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

 

6、在已有字符串中按照所给出范围和长度删除字符

 NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
 [String1 deleteCharactersInRange:NSMakeRange(0, 5)];
 

 

7、在已有字符串后面在所指定的位置中插入给出的字符串

NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
[String1 insertString:@"Hi! " atIndex:0];
 

 

8、按照所给出的范围,和字符串替换的原有的字符

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

 

9、判断字符串内是否还包含别的字符串(前缀,后缀)

NSString *String1 = @"NSStringInformation.txt";
[String1 hasPrefix:@"NSString"] = = 1 ?  NSLog(@"YES") : NSLog(@"NO");
[String1 hasSuffix:@".txt"] = = 1 ?  NSLog(@"YES") : NSLog(@"NO");
 

 

10、返回一个数组,包含已经由一个给定的分隔符分为接收器串。

- (NSArray*)componentsSeparatedByString:(NSString*)NString

参数
分离器
分隔符的字符串。

 

 

NSString *list = @"Norman, Stanley, Fletcher";
NSArray *listItems = [list componentsSeparatedByString:@", "];
listItems包含了:

{ @"Norman", @"Stanley", @"Fletcher" }.

 

 

 

11、是否包含该字符串

 

NSRange range = [@"字符串--A" rangeOfString:“是否包含--B”];


if (range.location == NSNotFound)

{//不包含

}

else

{//包含

}

 

 


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