打印：
2015-07-16 22:40:39.559 iOSStrongDemo[10165:3055448] string1:This is string2: iOSDevTip
8.插入字符串
复制代码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
（1）追加字符串
复制代码
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
9.删除字符串
复制代码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
10.替换字符串
复制代码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
11.去除字符串首尾的空格和换行符
复制代码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
注：相关教程知识阅读请移步到IOS开发频道。
