Question

我正在尝试在我的Xamarin.iOS应用程序中实现Facebook登录。我曾尝试使用Xamarin.Auth包，但有时用户无法处理，此包存在一些问题。我发现最好的方法是实现手动登录流程到我的应用程序（使用Web视图）。目前，我在Faceboook开发人员门户中创建了一个应用程序，我可以从我的iOS应用程序访问该链接。

因此，用户将点击正常按钮，该按钮将被转发到Facebook登录页面。我的问题是，如何从Facebook登录页面获得结果？以及如何获得用户ID，电子邮件，......？

到目前为止，这是源代码：

partial void BtnFacebookLogin_TouchUpInside(UIButton sender)
    {
        NSUrl apiRequest =
            new NSUrl("https://www.facebook.com/dialog/oauth?client_id="
            + SharedResources.fbClientId
            + "&response_type=token&redirect_uri="
            + SharedResources.fbRedirectUrl);

        UIApplication.SharedApplication.OpenUrl(apiRequest);
    }

Answer 1

我在下载官方SDK（Xamarin.Facebook.iOS）之后使用Facebook SDK找到答案，目前这被认为是最好的现有解决方案，以下是步骤：

在Info.plist文件中，添加以下代码：

<key>NSAppTransportSecurity</key>
  <dict>
    <key>NSExceptionDomains</key>
    <dict>
      <key>facebook.com</key>
      <dict>
        <key>NSIncludesSubdomains</key>
        <true/>
        <key>NSThirdPartyExceptionRequiresForwardSecrecy</key>
        <false/>
      </dict>
      <key>fbcdn.net</key>
      <dict>
        <key>NSIncludesSubdomains</key>
        <true/>
        <key>NSThirdPartyExceptionRequiresForwardSecrecy</key>
        <false/>
      </dict>
      <key>akamaihd.net</key>
      <dict>
        <key>NSIncludesSubdomains</key>
        <true/>
        <key>NSThirdPartyExceptionRequiresForwardSecrecy</key>
        <false/>
      </dict>
    </dict>
  </dict>
  <key>LSApplicationQueriesSchemes</key>
  <array>
    <string>fbapi</string>
    <string>fbapi20130214</string>
    <string>fbapi20130410</string>
    <string>fbapi20130702</string>
    <string>fbapi20131010</string>
    <string>fbapi20131219</string>
    <string>fbapi20140410</string>
    <string>fbapi20140116</string>
    <string>fbapi20150313</string>
    <string>fbapi20150629</string>
    <string>fbauth</string>
    <string>fbauth2</string>
    <string>fb-messenger-api20140430</string>
    <string>fb-messenger-api</string>
    <string>fbauth2</string>
    <string>fbshareextension</string>
  </array>

同样在Info.plist文件中，原始视图，高级选项卡，URL类型，像这样添加你的Facebook应用ID“fb1112222 ......”。保持'fb'开头。

Pic: Facebook app ID in Info.plist

在AppDelegate.cs中，覆盖以下方法：

    public override bool FinishedLaunching(UIApplication application, NSDictionary launchOptions)
    {
        // Override point for customization after application launch.
        // If not required for your application you can safely delete this method

        Profile.EnableUpdatesOnAccessTokenChange(true);
        Settings.AppID = "fb app id";
        Settings.DisplayName = "fb app name";

        // This method verifies if you have been logged into the app before, and keep you logged in after you reopen or kill your app.
        return ApplicationDelegate.SharedInstance.FinishedLaunching(application, launchOptions);

        //return true;
    }

    public override bool OpenUrl(UIApplication application, NSUrl url, string sourceApplication, NSObject annotation)
    {
        // We need to handle URLs by passing them to their own OpenUrl in order to make the SSO authentication works.
        return ApplicationDelegate.SharedInstance.OpenUrl(application, url, sourceApplication, annotation);
    }

最后，这是Facebook的功能，您可以使用自己的按钮，或使用您的按钮。在我的方式，我使用我的按钮名称（BtnFacebookLogin）。

//这是facebook功能

private void SetupFacebookLoginButton（） { 列出readPermissions = new List {“public_profile”，“email”};

        ////Set Up Button Design
        var fbBtnText = new NSAttributedString("login with facebook", new
            UIStringAttributes()
        {
            ForegroundColor = UIColor.White
        });


        BtnFacebookLogin.SetAttributedTitle(fbBtnText, UIControlState.Normal);
        BtnFacebookLogin.SetBackgroundImage(
            UIImage.FromBundle("btn_long_blue.png"), UIControlState.Normal);

        //Strat Login Functions
        Profile.Notifications.ObserveDidChange((sender, e) =>
        {
            if (e.NewProfile == null)
                return;

            if (AccessToken.CurrentAccessToken != null)
            {
                var request = new GraphRequest("/me?fields=name,email", null, AccessToken.CurrentAccessToken.TokenString, null, "GET");
                request.Start((connection, result, error) =>
                {
                    // Handle if something went wrong with the request
                    if (error != null)
                    {
                        showAlert("Error", error.Description);
                        return;
                    }

                    fbReponseFromSDK facebookSDKLoginItem = new fbReponseFromSDK();
                    // Get your profile name
                    var userInfo = result as NSDictionary;
                    if(userInfo["id"] != null)
                    { 
                        Console.WriteLine("id is: " + userInfo["id"].ToString());
                    }
                    if (userInfo["name"] != null)
                    { 
                        Console.WriteLine("name is: " + userInfo["name"].ToString());
                    }
                    if (userInfo["email"] != null)
                    { 
                        Console.WriteLine("email is: " + userInfo["email"].ToString());
                    }
                   //(Success) Do what you want next :
                    doneFacbookLogin();
                });
            }
        });

        // Handle actions once the user is logged in
        BtnFacebookLogin.ReadPermissions = readPermissions.ToArray();
        BtnFacebookLogin.Completed += (sender, e) =>
        {
            if (e.Error != null)
            {
                // Handle if there was an error
                showAlert("Facebook Login", e.Error.Description);
                return;
            }

            if (e.Result.IsCancelled)
            {
                // Handle if the user cancelled the login request
                //showAlert("Facebook Login", "Login Cancelled");
                return;
            }

            showAlert("Facebook Login", "Login Successfull");
        };

        // Handle actions once the user is logged out
        BtnFacebookLogin.LoggedOut += (sender, e) =>
        {
            // Handle your logout
        };

        // If you have been logged into the app before, ask for the your profile name
        if (AccessToken.CurrentAccessToken != null)
        {
            var request = new GraphRequest("/me?fields=name,email", null, AccessToken.CurrentAccessToken.TokenString, null, "GET");
            request.Start((connection, result, error) =>
            {
                // Handle if something went wrong with the request
                if (error != null)
                {
                    showAlert("Error", error.Description);
                    return;
                }

                // Get your profile name

            });
        }
    }

有关详情，请参阅GitHub中的样本（Link）

如何使用webview在Xamarin.iOS中实现手动Facebook登录

1 个答案: