移动端应用APP中集成开放SDK调起微信请求用户确认收款。 Objective-C 的UrlEncode处理正确的写法是什么 我是用以下代码UrlEncode处理不正确，特殊字符没有被编码 //    1. 确保已注册 AppID      [WXApi registerApp:wxAppId ];     // 2. 发起请求     WXOpenBusinessViewReq *req = [WXOpenBusinessViewReq object];     req.businessType = @"requestMerchantTransfer";     // 对 packageInfo 进行 URL 编码     NSString *encodedPackageInfo = [packageInfo stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];     req.query = [NSString stringWithFormat:@"mchId=11230000000&appId=wx8888888888888888&package=%@", encodedPackageInfo];     NSLog(@"openChargeHuihu req.query: %@", req.query);     // 3. 调用最新版微信 SDK 方法     [WXApi sendReq:req completion:^(BOOL success) {         if (!success) {             NSLog(@"微信请求发送失败！");         }     }];

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