如何知道Windows设备上存在后退按钮-硬件/软件-Windows 10桌面/移动应用程序-C＃

Question

I need to check whether a particular Windows device that runs my application have the back button, either on the device's hardware or in software (Windows 10 in tablet mode).

Someone can help me? Thanks

Answer 1

For the hardware back button, you can easily check it using ApiInformation.IsTypePresent method.

    public MainPage()
    {
        this.InitializeComponent();

        bool isHardwareButtonsAPIPresent =
            Windows.Foundation.Metadata.ApiInformation.IsTypePresent("Windows.Phone.UI.Input.HardwareButtons");

        if(isHardwareButtonsAPIPresent)
        {
            // add Windows Mobile extenstions for UWP
            Windows.Phone.UI.Input.HardwareButtons.BackPressed += HardwareButtons_BackPressed;
        }
    }

    private void HardwareButtons_BackPressed(object sender, Windows.Phone.UI.Input.BackPressedEventArgs e)
    {
        // hareware button pressed
    }

Answer 2

According to MSDN the back button should be always present for: Phone, Tablet, Surface Hub.

As for Desktop/Laptop software button in the title bar of the app can be enabled/disabled. You can check if it's visible by getting a property AppViewBackButtonVisibility :

bool isSoftwareButton = SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility == AppViewBackButtonVisibility.Visible;