iOS UTF8码和中文转换

1.中文转换UTF8:

NSString *data = @"你好，北京！";

    //转换成UTF-8

    NSString *dataUTF8 = [data stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

    NSLog(@"%@",dataUTF8);

2.UTF8转换中文：

 NSString *dataGBK = [dataUTF8 stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

    NSLog(@"%@",dataGBK);