Mac Catalyst does not support resizing or repositioning windows programmatically

Description

Setting a windows width/height or setting window X/Y does not actually update the window’s frame.

This appears to be a limitation in the Mac Catalyst approved APIs.

See also #4942

Steps to Reproduce

1. Set Window.Width = 400
2. Observe nothing happens

Version with bug

Unknown/Other (please specify)

Last version that worked well

Unknown/Other

Affected platforms

macOS

Affected platform versions

Mac Catalyst

Did you find any workaround?

There may be a potential workaround by setting the Min/Max coordinates and then reverting it. Not perfect, but seems to work OK.

Window.MinimumWidth = 700;
Window.MaximumWidth = 700;

Window.MinimumHeight = 500;
Window.MaximumHeight = 500;

// dispatcher is used to give the window time to actually resize
Dispatcher.Dispatch(() =>
{
	Window.MinimumWidth = 0;
	Window.MaximumWidth = double.PositiveInfinity;
	Window.MinimumHeight = 0;
	Window.MaximumHeight = double.PositiveInfinity;
});

Relevant log output

No response

[headintheclouds21]

With this Hanlder it works:

         Microsoft.Maui.Handlers.WindowHandler.Mapper.AppendToMapping(nameof(IWindow),
             (handler, view) =>
        {
#if MACCATALYST
                 var size = new CoreGraphics.CGSize(600, 400);
                 handler.PlatformView.WindowScene.SizeRestrictions.MinimumSize = size;
                 handler.PlatformView.WindowScene.SizeRestrictions.MaximumSize = size;
#endif
        });

I’m using .NET 7 and this is not working for me. I’ve placed it in the app.xaml.cs file with no luck. Has anyone had success with this?

[jinxinjuan]

Verified this issue with Visual Studio for Mac 17.6.2 (build 414). Can repro on macOS platform.