NSString 的八个使用技巧

1.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

2.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

3.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

4.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

5.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

6.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"];

7.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

8.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

，为了一些琐事吵架，然后冷战，疯狂思念对方，最后和好。

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