can not set background color in .net ios?

Question

I created .net ios (not xamarin.ios and MAUI).

Window = new UIWindow(frame: UIScreen.MainScreen.Bounds);
var rootView = new MainController();
Window.RootViewController = rootView;
Window.MakeKeyAndVisible();

in MainController

View.BackgroundColor = UIColor.SystemMint;

but the color is:

Answer 1

Hello,

After testing, setting the BackgroundColor in both parts of the following code works as expected.

public class AppDelegate : UIApplicationDelegate
{
    public override UIWindow? Window
    {
        get;
        set;
    }
 
    public override bool FinishedLaunching(UIApplication application, NSDictionary launchOptions)
    {
        // create a new window instance based on the screen size
        Window = new UIWindow(UIScreen.MainScreen.Bounds);
        var rootView = new MainViewController();
		// Part 1
        rootView.View.BackgroundColor = UIColor.SystemMint;
        Window.RootViewController = rootView;
        Window.MakeKeyAndVisible();
 
        
 
        return true;
    }
}
public class MainViewController : UIViewController
{
    public override void ViewDidLoad()
    {
        View = new UIView
        {
 
        };
 
        //Or Part 2
        View.BackgroundColor = UIColor.SystemMint;
        base.ViewDidLoad();
 
        // Perform any additional setup after loading the view
    }
}

Best Regards,

Alec Liu.

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