如何使用iOS渲染器在Xamarin Forms Shell应用程序的底部标签栏中添加背景图像？

Question

我知道如何在顶部标题区域执行此操作：

    protected override IShellSectionRenderer CreateShellSectionRenderer(ShellSection shellSection)
    {
        var renderer = base.CreateShellSectionRenderer(shellSection);
        if (renderer != null)
        {
            (renderer as ShellSectionRenderer).NavigationBar.SetBackgroundImage(UIImage.FromFile("LaunchIcon.png"), UIBarMetrics.Default);

        }
        return renderer;
    }

但不在底部导航标签区域中。

将感谢尝试自定义底部区域背景的任何人的任何建议。

Answer 1

在IOS ShellRenderer中 ，您可以覆盖IShellTabBarAppearanceTracker以将背景图像设置为TabBar。

protected override IShellTabBarAppearanceTracker CreateTabBarAppearanceTracker()
{
    return new MyOtherShellTabBarAppearanceTracker();
}

void IShellTabBarAppearanceTracker.SetAppearance(UITabBarController controller, ShellAppearance appearance)
    {
        base.SetAppearance(controller,appearance);
        var tabBar = controller.TabBar;
        UIImage image = UIImage.FromFile("TabBackground.png"); // tab bar background image
        tabBar.BackgroundImage = image;
        tabBar.ClipsToBounds = true;// if needed. If image is larger than the tab bar, the tab bar will expand to the image size. With this the image will be clipped to the tab bar size.
    }
}