iOS Thickness should be multiple to 2

Description

I discovered that, for example, to change the SafeArea in iOS, the values must be multiplied by 2. This is probably because of the retina.

But in large iPads there is a factor of 3x.

Maybe we should add some property that will depend on the system and we can multiply by it without worrying about compatibility?

https://developer.apple.com/documentation/uikit/uiscreen/1617836-scale

swift:

UIScreen.main.scale

cs:

UIKit.UIScreen.MainScreen.Scale

Steps to Reproduce

var scene = UIKit.UIApplication.SharedApplication.ConnectedScenes.ToArray<UIKit.UIWindowScene>().FirstOrDefault();
if (scene != null)
{
    var windowScene = (UIKit.UIWindowScene)scene;
    var safeArea = windowScene.Windows.FirstOrDefault()?.SafeAreaInsets;
    Padding =  new Thickness(
        -(safeArea.Value.Left * 2), //left
        Padding.Top, //safeArea.Value.Top, //-(safeArea.Value.Top * 2),// top, 
        -(safeArea.Value.Right * 2), //right
        -(safeArea.Value.Bottom * 2)); //bottom
}

Link to public reproduction project repository

no

Version with bug

7.0 (current)

Last version that worked well

Unknown/Other

Affected platforms

iOS

Affected platform versions

iOS

Did you find any workaround?

No response

Relevant log output

No response

[hartez]

also I found DeviceDisplay.Current.MainDisplayInfo.Density wich is scale. but for me it’s 3 with some reason.

Yes, if you are using a higher density display, the density will be higher: https://learn.microsoft.com/en-us/dotnet/api/microsoft.maui.devices.displayinfo.density?view=net-maui-7.0#remarks

But you really only need to know this if you are doing platform-specific work. For anything cross-platform, the density scaling is accounted for automatically. If you set the Padding for a Grid to 10, that value will be multiplied by the screen density for you by the layout engine; you don’t need to worry about it.

If you’re doing some sort of layout work in platform-specific code (e.g., in UISceneDelegate), and you need to account for the density yourself, then use DisplayInfo.Density.

[KSemenenko]

You multiplied by 2 and got the right size, I just think it would be nice to have some kind of constant for this.

because in case Apple releases new size screens, I’m afraid to imagine how many of these “multiply by 2” are in the production code. even in the maui code base there is such a thing.