問題描述

我的 Windows Phone 8.1 通用應用中有 2 個頁面.

I have 2 pages in my Windows Phone 8.1 Universal App.

我使用帶有點擊事件代碼的按鈕從 Page1.xaml 導航到 Page2.xaml:

I navigate from Page1.xaml to Page2.xaml by using a button with the click event code:

this.Frame.Navigate(typeof(Page2));

當我在第 2 頁上時，我使用硬件后退按鈕，應用程序會毫無例外地關閉.它只是返回到開始屏幕.

When I am on Page2, and I use the hardware back button the app closes without an exception or anything. It just returns to the startscreen.

我已經在 第 2 頁嘗試了以下操作:

I already tried the following on Page 2:

public Page2()
    {
        this.InitializeComponent();
        Windows.Phone.UI.Input.HardwareButtons.BackPressed += HardwareButtons_BackPressed;
    }

    void HardwareButtons_BackPressed(object sender, Windows.Phone.UI.Input.BackPressedEventArgs e)
    {
        Frame.GoBack();
    }

據我所知，我沒有清除后臺堆棧.

As far as I know I do not clear the back stack.

發生了什么，我該如何解決?

What is going on, and how can I fix this?

親切的問候，尼爾斯

推薦答案

這是 Windows Phone 8.1 的新功能.

This is new to Windows Phone 8.1.

如果您使用 VS2013 模板創建新的 Hub 通用應用程序，您會注意到 Common 文件夾中有一個名為 NavigationHelper 的類.

If you create a new Hub Universal App using a VS2013 template, you'll notice a class in Common folder called a NavigationHelper.

此 NavigationHelper 會提示您如何正確響應按下后退按鈕.因此，如果您不想使用 NavigationHelper，以下是如何恢復舊行為:

This NavigationHelper gives you a hint how to properly react to back button press. So, if you don't want to use the NavigationHelper, here's how to get the old behavior back:

public BlankPage1()
{
    this.InitializeComponent();
    HardwareButtons.BackPressed += HardwareButtons_BackPressed;
}

void HardwareButtons_BackPressed(object sender, BackPressedEventArgs e)
{
    if (Frame.CanGoBack)
    {
        e.Handled = true;
        Frame.GoBack();
    }
}

您也可以在應用級別執行此操作，以避免在每個頁面上執行此操作:

You can also do it on app level, to avoid having to do it on every page:

public App()
{
    this.InitializeComponent();
    this.Suspending += this.OnSuspending;

    #if WINDOWS_PHONE_APP
    HardwareButtons.BackPressed += HardwareButtons_BackPressed;
    #endif
}

#if WINDOWS_PHONE_APP
void HardwareButtons_BackPressed(object sender, BackPressedEventArgs e)
{
    Frame rootFrame = Window.Current.Content as Frame;

    if (rootFrame != null && rootFrame.CanGoBack)
    {
        e.Handled = true;
        rootFrame.GoBack();
    }
}
#endif

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