关于返回键，放在标题栏是目前较为完美的一种方案。继前一篇的Hello World，博主进行一些修改实现该方法。

- - - - - - - - - - - - - - - - - - - - - - - 我是万恶的分割线- - - - - - - - - - - - - - - - - - -

在OnLaunched的方法中加

Windows.UI.Core.SystemNavigationManager.GetForCurrentView().BackRequested += BackRequested;

紧接着在加一段代码

 SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility = rootFrame.CanGoBack ? AppViewBackButtonVisibility.Visible : Windows.UI.Core.AppViewBackButtonVisibility.Collapsed;

                rootFrame.Navigated += OnNavigated;

我们在继续把代码写完用两个方法来适配前面写的两段代码

private void OnNavigated(object sender, NavigationEventArgs e)

        {

            SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility = ((Frame)sender).CanGoBack ?

                AppViewBackButtonVisibility.Visible : AppViewBackButtonVisibility.Collapsed;

        }

private void BackRequested(object sender, BackRequestedEventArgs e)

        {

            Frame rootFrame = Window.Current.Content as Frame;

            if (rootFrame == null)

                return;

            if (rootFrame.CanGoBack && e.Handled == false)

            {

                e.Handled = true;

                rootFrame.GoBack();

            }

        }

为了能够看见效果，我们另外添加了一个页面



然后主界面的代码如下



基本的都做完了我们来看一下效果怎么样