Question

我正在使用具有android和IOS项目的xamarin.forms PCL

以下是步骤：

我没有在我的iphone中使用facebook app登录。
当我尝试在facebook上注册时，safari打开，弹出消息打开＆＃34;您已经授权APPName＆＃34;
我点击OK按钮，然后再次弹出＆＃34;在APPName＆＃34;中打开页面。我点击确定按钮

我得到token = null和Iscancel = true;

以下是我的代码：

public class FacebookLoginButtonRenderer : ButtonRenderer
{

    protected override void OnElementChanged(ElementChangedEventArgs<Button> e)
    {
        base.OnElementChanged(e);
        if (Control != null)
        {
            UIButton button = Control;

            button.TouchUpInside += delegate
            {
                HandleFacebookLoginClicked();
            };
        }
    }

    private void HandleFacebookLoginClicked()
    {
        LoginManager manager = new LoginManager();
        manager.Init();
        manager.LogOut();
        manager.LoginBehavior = LoginBehavior.SystemAccount;

        manager.LogInWithReadPermissions(new string[] { "public_profile", "email", "user_birthday" }, (result, error) =>
          {
              if (error != null)
              {
                  App.OnFacebookAuthFailed();
                  return;
              }
              else if (result.IsCancelled)
              {
                 return;
              }
              else {
                  var UserToken = result.Token.TokenString;
                  if (UserToken != null)
                  {
                      var request = new Facebook.CoreKit.GraphRequest("/me?fields=id,email,first_name,last_name,gender,birthday", null, UserToken, null, "GET");
                      request.Start((connection, result1, error1) =>
                      {
                          if (error1 != null)
                          {
                              new UIAlertView("Error...", error.Description, null, "Ok", null).Show();
                              return;
                          }
                          var obj = result1 as NSDictionary;
                          FBModel fb = new FBModel();

                          fb.ID = obj["id"].ToString();
                          fb.Name = obj["first_name"].ToString();
                          fb.Email = obj["email"].ToString();
                          fb.LastName = obj["last_name"].ToString();
                          fb.Gender = obj["gender"].ToString();
                          if (obj.ContainsKey(new NSString("birthday")))
                          {
                              var birthdate = obj["birthday"].ToString();
                              fb.Age = DateTime.Today.Year - Convert.ToInt32(birthdate.Split('/')[2]);
                          }
                          else
                          {
                              fb.Age = 25;
                          }

                          App.OnFacebookIOSAuthSuccess(fb);
                      });

                  }
              }
          });
    }
}

当我登录Facebook应用程序时，这段代码非常完美。

请建议我哪里出错了。我怎样才能获得令牌？

Answer 1

1）打开Safari浏览器

2）退出Facebook

3）打开应用程序并再次登录Facebook

   private void HandleFacebookLoginClicked(){

   LoginManager login = new LoginManager(); 
   login.LogInWithReadPermissions(readPermissions.ToArray(),
   delegate(LoginManagerLoginResult result, NSError error)

 {
    if (error != null)
     {
      App.OnFacebookAuthFailed();
     }
    else if (result.IsCancelled)
     {
       App.OnFacebookAuthFailed();
     }
     else
     {
       var accessToken = result.Token;
       App.OnFacebookAuthSuccess(accessToken.TokenString);
      }
      });
    }


     public override bool FinishedLaunching(UIApplication app, NSDictionary options)
    {

       FBSettings.DefaultAppID = FacebookAppId;
       FBSettings.DefaultDisplayName = FacebookAppName;


        return base.FinishedLaunching(app, options);
    }


    public override bool OpenUrl(UIApplication application, NSUrl url, string sourceApplication, NSObject annotation)
    {
        base.OpenUrl(application, url, sourceApplication, annotation);
        return FBSession.ActiveSession.HandleOpenURL(url);
    }

    public override void OnActivated(UIApplication application)
    {
        base.OnActivated(application);
        // We need to properly handle activation of the application with regards to SSO
        // (e.g., returning from iOS 6.0 authorization dialog or from fast app switching).
        FBSession.ActiveSession.HandleDidBecomeActive();
    }
}

如何获得Facebook登录令牌，点击确定按钮后＆＃34;您已经获得授权APPName＆＃34; Facebook的

1 个答案: