App.xaml.cs

MainPage = new NavigationPage(new Home());

Home.xaml.cs

public Home()
    {
        Children.Insert(0,new CarPage1());
        Children.Insert(1,new CarPage2());
        Children.Insert(2,new CarPage3());
        CurrentPage = Children[1];
    }

CarPage1.xaml.cs

protected override void OnAppearing()
    {
        base.OnAppearing();
        DisplayAlert("Page1", null, "ok");
    }

CarPage2.xaml.cs

protected override void OnAppearing()
    {
        base.OnAppearing();
        DisplayAlert("Page2", null, "ok");
    }

CarPage3.xaml.cs

protected override void OnAppearing()
    {
        base.OnAppearing();
        DisplayAlert("Page3", null, "ok");
    }

运行UWP第2页警报显示。x1c 0d1x
单击“确定”为什么第1页警报显示？

单击UWP左侧符号为什么没有显示Page 1警报？

运行Xamarin。Android工作正常！！