NSString *some = @"abcdefg你"; NSLog(@"%@",some); //将字符串转成大写 some = [some uppercaseString]; NSLog(@"%@",some); //将字符串转成小写 some = [some lowercaseString]; NSLog(@"%@",some); //获取字符串长度 8 NSLog(@"%u",[some length]); //在字符串中查找字符串 NSRange rang = [some rangeOfString:@"c"]; if( rang.location == NSNotFound ) { NSLog(@"%@",@"not found"); } else { NSLog(@"%d %d",rang.location, rang.length); } //判断两个字符串是否相同 if( [some isEqualToString:@"abcdefg你"] ) { NSLog(@"%@",@"YES"); } //字符串转数值 NSLog(@"%d",[@"123" intValue]); //字符串是否以什么开头 if([some hasPrefix:@"abc"]) { NSLog(@"%@",@"YES"); } //字符串是否以什么结尾 if([some hasSuffix:@"你"]) { NSLog(@"%@",@"YES"); } //截取字符串 NSLog(@"%@", [some substringWithRange:NSMakeRange(1, 5)]); //剔除两边空格 NSLog(@"%@", [@" ccd " stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]]);