Win10的UWP之标题栏的返回键(一)

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。
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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