0.首字母大写

代码：

//首字母大写

NSString *string = @"ligang";

NSLog(@"string: %@",[string capitalizedString]);

打印：

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

1.分割字符串

代码：

//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);

打印：

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

2.追加字符串

代码：

//追加字符串

NSMutableString *string = [[NSMutableString alloc] initWithString:@"I Love "];

[string appendString:@"China"];

NSLog(@"string:%@",string);

打印：

2015-07-16 22:42:32.305 iOSStrongDemo[10189:3056410] string:I Love China

3.插入字符串

代码：

//插入字符串

NSMutableString *string = [[NSMutableString alloc] initWithString:@"I China"];

[string insertString:@"Love " atIndex:2];

NSLog(@"string: %@",string);

打印：

2015-07-16 22:44:10.706 iOSStrongDemo[10206:3057014] string: I Love China

4.删除字符串

代码：

//删除字符串

NSMutableString *string = [[NSMutableString alloc] initWithString:@"I love China"];

[string deleteCharactersInRange:NSMakeRange(2, 4)];

NSLog(@"String1: %@",string);

打印：

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

5.判断是否包含前后缀

代码：

//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

代码：

//替换字符串

NSString *string = @"I love China";

NSString *replaceString = [string stringByReplacingOccurrencesOfString:@"love" withString:@"like"];

NSLog(@"replaceString:  %@",replaceString);

打印：

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

代码：

//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);

打印：

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

代码已经更新，demo下载地址：iOSStrongDemo