MyView | my custom control -

With regards to the image analysis resolution, the documentation of ImageAnalysis.Builder.setTargetResolution() states that:

The maximum available resolution that could be selected for an ImageAnalysis is limited to be under 1080p.

So setting a size of 2560x800 won't work as you expect. In return CameraX seems to be selecting the maximum ImageAnalysis resolution that has the same aspect ratio you requested (2560/800 = 1280/400).

The problem with the above code on first line. I mean declaring myView. Use private lazy var myView: UIView = { ... } instead of using private let myView: UIView = { ... } will resolve the problem.

I've faced this problem, so I think others might face the same. So I post this. Thanks.

Trying to change the view's height from inside draw() is probably a really bad idea.

First, as you've seen, changing the intrinsic content size does not trigger a redraw. Second, if it did, your code would go into an infinite recursion loop.

Take a look at this edit to your class:

As @Jason mentioned, since boxView belongs to MainPage it's better to handle it animation in MainPage's code-behind, for that you need to expose a public event handler of View1, subscribe to it in MainPage code-behind, and invoke it from view1 code-behind:

MainPage.xaml

Your question is a bit unclear. However, I guess you're trying to achieve that whenever the selected month changes, the array of selectable days gets updated.

While I don't exactly see your concrete issue, I see kind of a design issue, which may be the root cause of having issues.

In my opinion, such a logic should be implemented at the viewmodel level (in your case your MyView class), as it's not related to the view, but purely to the model. In other words, to handle changes of an observable data, you should not wire it through the view using things like change events, but directly handle the observable's notifications.

I would implement something like this in the MyView constructor.

You can map each entry in the map to a CategorySummary, then reduce to a MyResponse:

onAppear is called after MyView loads for the first time, and at that moment, answers is still empty. That's why your program crashes at ForEach(0..<4), because answers's doesn't have 4 elements yet.

I am not sure what is the point of your ItemDelegate, but from your description I think you need to do something like this:

You can't at the moment, even if there is a way it will be kind of hacky.

Instead, you can consider rendering a placeholder/skeleton first similar to this: Then, when the data is ready and verified, you replace the placeholder/skeleton with actual content.

As for error handling, you can do something like this: