如何删除 iOS 上显示的标签栏上方的行

Question

Here's what I am trying to remove. I thought it was already removed in earlier iOS but now in 13.3 I think it's back again:

Here is the renderer code I was using before:

    protected override IShellItemRenderer CreateShellItemRenderer(ShellItem item)
    {
        var renderer = base.CreateShellItemRenderer(item);
        (renderer as ShellItemRenderer).TabBar.Translucent = false;
        (renderer as ShellItemRenderer).TabBar.ShadowImage = new UIImage(); // <<<<<<<
        (renderer as ShellItemRenderer).TabBar.BackgroundImage = new UIImage();
        UITabBar myTabBar = (renderer as ShellItemRenderer).TabBar;

        foreach (var barItem in myTabBar.Items)
        {
            barItem.ImageInsets = new UIEdgeInsets(5, 0, 0, 0);
        }
        return renderer;
    }

Answer 1

The overriden method CreateShellItemRenderer can not get Tabbar now , it will return null . Therefore code can not work .

You can override CreateTabBarAppearanceTracker to get Tabbar in iOS 13 .As follow :

[assembly: ExportRenderer(typeof(AppShellTab.AppShell), typeof(AppShellTab.iOS.MyShellRenderer))]
namespace AppShellTab.iOS
{
    public class MyShellRenderer : ShellRenderer
    {
        protected override IShellTabBarAppearanceTracker CreateTabBarAppearanceTracker()
        {
            return new MyOtherTabBarAppearanceTracker();
        }

        public class MyOtherTabBarAppearanceTracker : ShellTabBarAppearanceTracker, IShellTabBarAppearanceTracker
        {
            void IShellTabBarAppearanceTracker.SetAppearance(UITabBarController controller, ShellAppearance appearance)
            {
                base.SetAppearance(controller, appearance);
                var tabBar = controller.TabBar;
                tabBar.BackgroundImage = new UIImage();
                tabBar.ClipsToBounds = true;
                //tabBar.Translucent = false;
            }
        }
    }
}

The effect :

Answer 2

that's the Home Indicator

<ContentPage ...
             xmlns:ios="clr-namespace:Xamarin.Forms.PlatformConfiguration.iOSSpecific;assembly=Xamarin.Forms.Core"
             ios:Page.PrefersHomeIndicatorAutoHidden="true">
    ...
</ContentPage>