将“文艺青年”改成“213青年”

//2.将“文艺青年”改成“213青年”。 //方法1 NSString *str1 = @"文艺青年"; NSString *str2 = [str1 stringByReplacingOccurrencesOfString:@"文艺" withString:@"213" ]; NSLog(@"%@",str2);
//方法2 NSString *str1 = @"文艺青年"; NSString *str2 = [str1 stringByReplacingCharactersInRange:NSMakeRange(0, 2) withString:@"213"]; NSLog(@"%@",str2); //方法3 NSMutableString *str1 = [NSMutableString stringWithFormat:@"文艺青年" ]; [str1 deleteCharactersInRange:NSMakeRange(0, 2)]; [str1 insertString:@"213" atIndex:0]; NSLog(@"%@",str1); //方法4 NSMutableString *str1 = [NSMutableString stringWithFormat:@"文艺青年"]; [str1 setString:@"213青年"]; NSLog(@"%@",str1);

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