Question

我有一个简单的代码，可以在特定于平台的代码中进行身份验证：

[assembly: ExportRenderer(typeof(FacebookLoginPage), typeof(FacebookLoginRenderer))]
namespace VejoSeriesMobile.Droid.Renderers
{
    public class FacebookLoginRenderer : PageRenderer
    {
        public static string ClientId = "";
        public static string ClientSecret = "";
        public static string Scope = "email, public_profile";
        public static string AuthorizeUrl = "https://m.facebook.com/dialog/oauth";
        public static string RedirectUrl = "https://www.facebook.com/connect/login_success.html";
        public static string AccessTokenUrl = "https://m.facebook.com/dialog/oauth/token";
        protected override void OnElementChanged(ElementChangedEventArgs<Page> e)
        {
            base.OnElementChanged(e);
            var activity = this.Context as Activity;
            var auth = new OAuth2Authenticator(
              clientId: "717427648360004",
              scope: Scope,
              authorizeUrl: new Uri("https://m.facebook.com/dialog/oauth/"),
              redirectUrl: new Uri("http://www.facebook.com/connect/login_success.html"));
            auth.Completed += OnAuthenticationCompleted;
            activity.StartActivity(auth.GetUI(activity));
        }

        async void OnAuthenticationCompleted(object sender, AuthenticatorCompletedEventArgs e)
        {
            if (e.IsAuthenticated)
            {
                var request = new OAuth2Request("GET", new Uri("https://graph.facebook.com/me?fields=id,name,picture,email"), null, e.Account);
                await request.GetResponseAsync().ContinueWith(t =>
                {
                    var fbUser = JObject.Parse(t.Result.GetResponseText());
                    var id = fbUser["id"].ToString().Replace("\"", "");
                    var name = fbUser["name"].ToString().Replace("\"", "");
                    var email = fbUser["email"].ToString().Replace("\"", "");
                    var conta = new Account { Username = name };
                    conta.Properties.Add("email", email);
                    AccountStore.Create(Context).Save(conta, "VejoSeries");
                    App.SuccessfulLoginAction.Invoke();
                });
            }
        }
    }
}

在我的App便携式类中，我有一个在登录完成后调用的静态方法：

但是在这个范围内我只能使用Static方法，我希望在登录后调用一个非静态方法来重新呈现整个页面（带菜单等）。我怎么能这样做？

在我的成功之上登录行动：

       public static Action SuccessfulLoginAction
    {
        get
        {
            return new Action(() =>
            {
                //var masterDetailPage = Application.Current.MainPage as MasterDetailPage;
                //masterDetailPage.Detail = new NavigationPage((Page)Activator.CreateInstance(typeof(Painel)));
                //masterDetailPage.IsPresented = false;
                _NavPage.Navigation.PopAsync();
                _NavPage.Navigation.PushAsync(new MainPage());
            });
        }
    }

Answer 1

简短的回答是不要让它变得静止。如果您将其更改为公共财产，则可以通过App.Current访问它。更具体一点：

public Action SuccessfulLoginAction
{
    get
    {
        return new Action(() =>
        {
            //var masterDetailPage = Application.Current.MainPage as MasterDetailPage;
            //masterDetailPage.Detail = new NavigationPage((Page)Activator.CreateInstance(typeof(Painel)));
            //masterDetailPage.IsPresented = false;
            _NavPage.Navigation.PopAsync();
            _NavPage.Navigation.PushAsync(new MainPage());
        });
    }
}

然后从这样的地方打电话：

((App)Application.Current).SuccessfulLoginAction.Invoke();

这样您就可以访问_NavPage，因为整个事情都绑定到App的实例。

在PageRenderer Xamarin中调用非静态方法

1 个答案: