Xamarin Forms-如何在没有导航页面的情况下更改状态栏颜色

Question

我想在某些视图上更改状态栏的颜色。

我找到了此解决方案https://github.com/yuv4ik/XFDynamicStatusBarAppearance

但是它仅与NavigationPage一起使用。

我不需要从我的应用程序导航页中...

    public App()
    {
        InitializeComponent();

        MainPage = new MainPage();
    }

这是我的尝试...

    var statusBarStyleManager = DependencyService.Get<IStatusBarStyleManager>();

    MainCarousel.PositionChanged += (sender, e) =>
    {
        switch (e.CurrentPosition)
        {
            case 1:
                Device.BeginInvokeOnMainThread(() =>
                {
                    Xamarin.Forms.Application.Current.MainPage.SetValue(Xamarin.Forms.NavigationPage.BarBackgroundColorProperty, Color.DarkCyan);

                    //((Xamarin.Forms.NavigationPage)Xamarin.Forms.Application.Current.MainPage).BarBackgroundColor = Color.DarkCyan;
                    statusBarStyleManager.SetDarkTheme();
                });
                break;
            case 0:
            case 2:
                Device.BeginInvokeOnMainThread(() =>
                {
                    Xamarin.Forms.Application.Current.MainPage.SetValue(Xamarin.Forms.NavigationPage.BarBackgroundColorProperty, Color.LightGreen);
                    statusBarStyleManager.SetLightTheme();
                });
                break;
            default:
                break;
        }

    };

如何更改状态栏颜色？

Answer 1

您可以尝试在Android平台上的OnCreate方法中添加此代码：

 protected override void OnCreate(Bundle savedInstanceState)
    {
        TabLayoutResource = Resource.Layout.Tabbar;
        ToolbarResource = Resource.Layout.Toolbar;

        base.OnCreate(savedInstanceState);

        global::Xamarin.Forms.Forms.Init(this, savedInstanceState);

        LoadApplication(new App());
       Window.SetStatusBarColor(Android.Graphics.Color.Argb(255, 0, 0, 0)); //here

    }

[请注意，SetStatusBarColor仅在API级别21和更高版本中受支持。因此，我们应该在调用SetStatusBarColor之前进行检查。

if (Android.OS.Build.VERSION.SdkInt >= BuildVersionCodes.Lollipop)

  {
   Window.SetStatusBarColor(...);
  }

更新：

在PCL中创建界面：

public  interface IStatusBarColor
{
    void changestatuscolor(string color);
}

现在，Mainactivity实现此接口。

[assembly: Dependency(typeof(demo2.Droid.MainActivity))]
 namespace demo2.Droid
 {
[Activity(Label = "demo2", Icon = "@mipmap/icon", Theme = "@style/MainTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity,IStatusBarColor
{

    public static Context context;
    protected override void OnCreate(Bundle savedInstanceState)
    {
        TabLayoutResource = Resource.Layout.Tabbar;
        ToolbarResource = Resource.Layout.Toolbar;

        base.OnCreate(savedInstanceState);

        global::Xamarin.Forms.Forms.Init(this, savedInstanceState);

        LoadApplication(new App());

    }



    public void changestatuscolor(string color)
    {
        if (Build.VERSION.SdkInt >= BuildVersionCodes.Lollipop)
        {
            var c = MainActivity.context as FormsAppCompatActivity;
            c?.RunOnUiThread(() => c.Window.SetStatusBarColor(Android.Graphics.Color.ParseColor(color)));
        }

    }
    protected override void OnResume()
    {
        context = this;
        base.OnResume();
    }

}

}

在主页中，更改按钮单击事件中的状态栏颜色。

 private void Changecolor_Clicked(object sender, EventArgs e)
    {
        DependencyService.Get<IStatusBarColor>().changestatuscolor(Color.Red.ToHex());
    }