隐藏特定ContentPage的StatusBar

Question

我正在创建一个应用程序,我想隐藏特定页面上的状态栏.在我的例子中,它是一个ContentPage.我找到了几个样本,其中info.plist用于隐藏它,但我只想要它用于特定页面,是否可能？使用NavigationPage.SetHasNavigationBar隐藏导航栏很容易,但状态栏似乎有点不同.

Answer 1

据我所知,Xamarin不通过Xamarin.Forms类提供此功能.您需要在每个特定于平台的项目中实现它.

但是,这应该相当容易,因为您可以使用DependencyService来处理它.

这是一个快速实施......

App.cs

public App()
{
    var layout = new StackLayout
    {
        VerticalOptions = LayoutOptions.Center,
        Children =
        {
            new Label
            {
                XAlign = TextAlignment.Center,
                Text = "Welcome to Xamarin Forms!"
            }
        }
    };

    var button = new Button
    {
        Text = "Click Me"
    };
    button.Clicked += (object sender, EventArgs e) => 
        {
            if (_isHidden)
            {
                // show
                DependencyService.Get<IStatusBar>().ShowStatusBar();
            }
            else
            {
                // hide
                DependencyService.Get<IStatusBar>().HideStatusBar();
            }

            _isHidden = !_isHidden;
        };

    layout.Children.Add(button);

    // The root page of your application
    MainPage = new ContentPage
    {
        Content = layout
    };
}

IStatusBar.cs

public interface IStatusBar
{
    void HideStatusBar();
    void ShowStatusBar();
}

AndroidImplementation

[assembly: Xamarin.Forms.Dependency(typeof(StatusBarImplementation))]
namespace MyXamarinApp.Droid
{
    public class StatusBarImplementation : IStatusBar
    {
        public StatusBarImplementation()
        {
        }

        WindowManagerFlags _originalFlags;

        #region IStatusBar implementation

        public void HideStatusBar()
        {
            var activity = (Activity)Forms.Context;
            var attrs = activity.Window.Attributes;
            _originalFlags = attrs.Flags;
            attrs.Flags |= Android.Views.WindowManagerFlags.Fullscreen;
            activity.Window.Attributes = attrs;
        }

        public void ShowStatusBar()
        {
            var activity = (Activity)Forms.Context;
            var attrs = activity.Window.Attributes;
            attrs.Flags = _originalFlags;
            activity.Window.Attributes = attrs;
        }

        #endregion
    }
}

iOSImplementation

[assembly: Xamarin.Forms.Dependency(typeof(StatusBarImplementation))]
namespace MyXamarinApp.iOS
{
    public class StatusBarImplementation : IStatusBar
    {
        public StatusBarImplementation()
        {
        }

        #region IStatusBar implementation

        public void HideStatusBar()
        {
            UIApplication.SharedApplication.StatusBarHidden = true;
        }

        public void ShowStatusBar()
        {
            UIApplication.SharedApplication.StatusBarHidden = false;
        }

        #endregion
    }
}

我们的想法是,当您需要隐藏状态栏时,可以调用DependencyService实现来隐藏状态栏ContentPage.您也可能需要在隐藏后再次显示它(不太确定).

注意:对于iOS,您需要更新Info.plist文件以允许应用程序更改状态栏可见性.