ios urlencode方法

  网络传输的时候有些特殊的字符需要编一下码 

   NSString *sdfsa = @"你好啊xxcxcxc=!'*&";

    NSString *plat_orderid_1 = (NSString *)CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)sdfsa, NULL, CFSTR("!*'();:@&=+$,/?%#[]"), kCFStringEncodingUTF8));//此种方法好用

    NSString *urlEn = [sdfsa stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

    NSLog(@"+++++++++++++++%@, iiiiiendcode is %@",plat_orderid_1,urlEn);