Xamarin Shell tabbar color changes on iOS when there is content behind it-CodePudding

I have a Shell Tabbar with a custom renderer and a Collection view that goes behind it. Now when there is content in my Collection view that is behind the tabbar, the tabbar background color whitens.

before

What's more , there is a small suggestion to your code .

SetAppearance method calls while switching the Tabbar,so it keeps adding the view .

It is supposed to add the view only once ,it's better to change the logic .

Update

UIView myView = null;
public void SetAppearance(UITabBarController controller, ShellAppearance appearance)
{
    UITabBar myTabBar = controller.TabBar;
    UIColor tabBarColor = UIColor.White;  //to any color you want

    if (myTabBar != null)
    {
       if (myView != null) return;

       myView = new UIView(new CGRect(0, 0, myTabBar.Frame.Width, 2)) { BackgroundColor = Color.FromRgb(17, 17, 17).ToUIColor() };
               
       myTabBar.AddSubview(myView);

       myTabBar.BackgroundColor = tabBarColor;//change
       myTabBar.BarTintColor = tabBarColor;

       myTabBar.UnselectedItemTintColor = UIColor.White;

       if (myTabBar.Items != null)
       {
           foreach (UITabBarItem item in myTabBar.Items)
           {
               item.Title = null;
               item.ImageInsets = new UIEdgeInsets(10, 0, 0, 0);
           }
        }
    }
}

CodePudding user response：

I now solved it, the hint with the transparency was right it just wasn't the transparency of the color, my tabbar was somehow set to translucent

my working code:

UIView myView = null;
    public void SetAppearance(UITabBarController controller, ShellAppearance appearance)
    {
        UITabBar myTabBar = controller.TabBar;
        UIColor tabBarColor = ((Xamarin.Forms.Color)Xamarin.Forms.Application.Current.Resources["MyTabBarColor"]).ToUIColor();

        if (myTabBar != null)
        {
            myView = new UIView(new CGRect(0, 0, myTabBar.Frame.Width, 2)) { BackgroundColor = Color.FromRgb(17, 17, 17).ToUIColor() };
            myTabBar.AddSubview(myView);

            myTabBar.BackgroundColor = tabBarColor;
            myTabBar.BarTintColor = tabBarColor;
            myTabBar.Translucent = false;

            myTabBar.UnselectedItemTintColor = UIColor.White;

            if (myTabBar.Items != null)
            {
                foreach (UITabBarItem item in myTabBar.Items)
                {
                    item.Title = null;
                    item.ImageInsets = new UIEdgeInsets(10, 0, 0, 0);
                }
            }
        }
    }