NSString的八条实用技巧

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0.首字母大写

//首字母大写
Nsstring *string = @"ligang";
NSLog(@"string: %@",[string capitalizedString]); 

2015-07-16 23:06:11.652 iOsstrongDemo[10279:3062010] string: Ligang 

1.分割字符串

//分割字符串
Nsstring *string = @"This is a iOSDevTip";
NSArray *array = [string componentsSeparatedByString:@"a"];
Nsstring *string1 = [array objectAtIndex:0];
Nsstring *string2 = [array objectAtIndex:1];
NSLog(@"string1:%@  string2:%@",string1,string2); 

2015-07-16 22:40:39.559 iOsstrongDemo[10165:3055448] string1:This is   string2: iOSDevTip 

2.追加字符串

//追加字符串
NSMutableString *string = [[NSMutableString alloc] initWithString:@"I love "];
[string appendString:@"China"];
NSLog(@"string:%@",string); 

2015-07-16 22:42:32.305 iOsstrongDemo[10189:3056410] string:I love China 

3.插入字符串

//插入字符串
NSMutableString *string = [[NSMutableString alloc] initWithString:@"I China"];
[string insertString:@"love " atIndex:2];
NSLog(@"string: %@",string); 

2015-07-16 22:44:10.706 iOsstrongDemo[10206:3057014] string: I love China 

4.删除字符串

 //删除字符串
NSMutableString *string = [[NSMutableString alloc] initWithString:@"I love China"];
[string deleteCharactersInRange:NSMakeRange(2,4)];
NSLog(@"String1: %@",string); 

2015-07-16 22:46:58.437 iOsstrongDemo[10219:3057749] String1: I  China 

5.判断是否包含前后缀

 //判断是否包含前后缀
Nsstring *string = @"I love China";
BOOL isHasI = [string hasPrefix:@"I"];
BOOL isHasChina = [string hasSuffix:@"China"]; 

6.替换字符串

//替换字符串
Nsstring *string = @"I love China";
Nsstring *replaceString = [string stringByReplacingOccurrencesOfString:@"love" withString:@"like"];
NSLog(@"replaceString:  %@",replaceString); 

2015-07-16 22:56:07.405 iOsstrongDemo[10236:3059503] replaceString:  I like China 

7.去除字符串首尾的空格和换行符

//去除字符串首尾的空格和换行符
Nsstring *string = @" I love China ";
Nsstring *text = [string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
NSLog(@"text:%@",text); 

2015-07-16 23:00:47.845 iOsstrongDemo[10265:3061013] text:I love China 

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