//iOS编码转码URLEncoder.encode

    NSString *reqJson = [BGMD5 dictionaryToJson:payWayInfo];
    NSString *encodedValue = (NSString*)CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(nil,(CFStringRef)reqJson, nil,(CFStringRef)@"!*'();:@&=+$,/ %#[]", kCFStringEncodingUTF8));
    NSLog(@"encodedValue = %@", encodedValue);