在App类上我有这个:MainPage=newNavigationPage(newMainPage());在MainPageOnAppearing中:protectedasyncoverridevoidOnAppearing(){base.OnAppearing();if(TempUserInfo.IsNewUser())awaitthis.Navigation.PushModalAsync(newSignUpPage());}在用户输入所有信息后，在SignUpPage上，我使用这个:awaitthis.Navigation.PushModalAsync(newVerificatio