iOS - 汉字 UTF8 互转

/// 汉字 UTF8 互转

    NSString* strA = [@"%E4%B8%AD%E5%9B%BD" stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];  
    NSString *strB = [@"中国" stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];  
    NSLog(@"%@",strA); // 中国  
    NSLog(@"%@",strB); // %E4%B8%AD%E5%9B%BD