[iOS] Handle focus changes for UIButton

[rmarinho]

Description of Change

Handle button focus changes for UIButton

code to test on maccatalyst, make sure all events fire when for example using tab key

<StackLayout>
        <Label Text="Does this can be focused?"/>
        <Entry Text="Focus Entry" Focused="EntryFocused" Unfocused="EntryUnfocused" />
        <Button Text="Focus Button" Focused="BtnFocused" Unfocused="BtnUnfocused"  />
        <Label Text="Seems to work" />
</StackLayout>

Issues Fixed

Fixes #6482

[rmarinho]

Tried to add Device tests but it didn't work ..

[Fact(DisplayName = "Focused event Fires")]
public async Task FocusFires()
{
            var button = new ButtonStub();

            var nativeButtonFocused = await GetValueAsync((IView)button,
            handler =>
            {    
                var mauiBtn = handler.PlatformView as Microsoft.Maui.Platform.MauiButton;
                mauiBtn.Focus(new FocusRequest(true));
                mauiBtn.BecomeFirstResponder();
                return handler.PlatformView.Focused;
            });

            Assert.True(nativeButtonFocused);
            Assert.True(button.IsFocused);
}

[mattleibow]

There is no buttondelegate or controlfocusdelegate?

[rmarinho]

@PureWeen we are stuck on this failing test because there's no way to remove the observer when setting the handler just to null.

[rmarinho]

So i guess this is blocked on:

• DisconnectHandler not being called on iOS
• Also the MemoryTests don't take in account a way to remove the subscription since they only set the handler to null

Ideas @PureWeen ?

[github-actions[bot]]

:warning: Your code has been reformatted. :warning:

[jsuarezruiz]

So i guess this is blocked on:

• DisconnectHandler not being called on iOS
• Also the MemoryTests don't take in account a way to remove the subscription since they only set the handler to null

Ideas @PureWeen ?

Is still blocked by this?, could I help in some way?

[ghost]

Hi @rmarinho. We have added the "s/pr-needs-author-input" label to this issue, which indicates that we have an open question/action for you before we can take further action. This PRwill be closed automatically in 14 days if we do not hear back from you by then - please feel free to re-open it if you come back to this PR after that time.

[ghost]

Hi @rmarinho. It seems you haven't touched this PR for the last two weeks. To avoid accumulating old PRs, we're marking it as stale. As a result, it will be closed if no further activity occurs within 4 days of this comment. You can learn more about our Issue Management Policies here.