Xamarin.ios 不适用于真正的 iOS 设备，但它适用于模拟器

Question

I build a mobile App. This App is working really well on iOS simulator, Android emulator and Android real device. But When I published it on TestFlight and install on a real iOS device then this app does not work. I don't get any error. My spinner(activator indicator) is running forever and I cannot get any response from HttpResponse. I built this app with Web service. Therefore I'm using http://46.221..... url to post or get request. I thought that iOS does not support http request because of security. But if it's true then Why this app is running on simulator very well? I couldn't find any solution. Here is my part of codes:

public async Task<BSUser> ValidateUser(string userName, string password)
    {
        string url = Xamarin.Essentials.Preferences.Get(Constants.URL_KEY, "") + "/api/Validateuser";
        HttpClient _Client = new HttpClient();

        var data = new Dictionary<string, string>
        {
          {"userName", userName},
          {"password", password}
        };

        string jsonData = JsonConvert.SerializeObject(data);
        HttpContent content = new StringContent(jsonData, Encoding.UTF8, "application/json");

        try
        {
            HttpResponseMessage httpResponse = await _Client.PostAsync(url, content);
            if (httpResponse.IsSuccessStatusCode)
            {
                var responseData = await httpResponse.Content.ReadAsStringAsync().ConfigureAwait(false);
                var result = JsonConvert.DeserializeObject(responseData).ToString();
                UserInfo userInfo = JsonConvert.DeserializeObject<UserInfo>(result);

                BSUser value = new BSUser();
                value.UserName = userInfo.userCode;

                return value;
            }
            else
            {
                return null;
            }
        }
        catch (SystemException)
        {
            return null;
        }
    }

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Answer 1

I found the problem of my project. It's not related on HTTPS-HTTP or security situation. It's so absurd and illogical but it's the real problem. My app works on any iOS simulator well enough however, Minimum version of simulator is iPhone-8 in Visual Studio. But When I installed my app on real devices of iPhone-6 I got Newtonsoft.Json.JsonSerializationException error. But My HttpResponse returned 200OK and I see all values which comes from my service as a json. I think there some difference between old ve new versions of iPhones to convert Json Serialization.

Answer 2

It looks like you really should take advantage of HTTPS instead of HTTP. You can refer to these pages for more information:

https://www.hackingwithswift.com/example-code/system/how-to-handle-the-https-requirements-in-ios-with-app-transport-security

https://developer.apple.com/documentation/security/preventing_insecure.network_connections?language=objc

This is the problem with ATS in ios, if you want to use HTTP, you can config of it. https://learn.microsoft.com/en-us/xamarin.ios/app-fundamentals/ats#configuring-ats-options .

Someone others meet the same problem like you: Xamarin Forms, iOS will not open links in WebView