Deprecate FluentUIHostingController in iOS 16

[huwilkes]

Platforms Impacted

• iOS
• macOS

Description of changes

There were some new APIs in iOS 16.4 that we could use instead of our neat swizzling, but it turns out we just don't need the whole class anymore.

Binary change

Total increase: 2,480 bytes
Total decrease: -2,160 bytes

File	Before	After	Delta
Total	30,487,960 bytes	30,488,280 bytes	⚠️ 320 bytes

Full breakdown

File	Before	After	Delta
ControlHostingView.o	61,712 bytes	63,600 bytes	⚠️ 1,888 bytes
__.SYMDEF	4,604,016 bytes	4,604,512 bytes	⚠️ 496 bytes
PeoplePicker.o	291,784 bytes	291,880 bytes	⚠️ 96 bytes
SearchBar.o	418,824 bytes	418,776 bytes	🎉 -48 bytes
ActivityIndicatorCell.o	80,424 bytes	80,368 bytes	🎉 -56 bytes
MSFCardNudge.o	41,016 bytes	40,912 bytes	🎉 -104 bytes
MSFNotification.o	143,600 bytes	143,488 bytes	🎉 -112 bytes
MSFAvatar.o	29,176 bytes	29,064 bytes	🎉 -112 bytes
MSFPersonaButtonCarousel.o	35,720 bytes	35,608 bytes	🎉 -112 bytes
MSFActivityIndicator.o	31,800 bytes	31,688 bytes	🎉 -112 bytes
MSFAvatarGroup.o	29,680 bytes	29,560 bytes	🎉 -120 bytes
MSFHeadsUpDisplay.o	35,056 bytes	34,928 bytes	🎉 -128 bytes
MSFPersonaButton.o	29,504 bytes	29,344 bytes	🎉 -160 bytes
MSFIndeterminateProgressBar.o	29,880 bytes	29,712 bytes	🎉 -168 bytes
FocusRingView.o	783,656 bytes	782,728 bytes	🎉 -928 bytes

Verification

Tested on iOS 14.5, 15.0, 16.0, and 16.2
Made sure not to regress the fixes added in

• Fixing side effect of UIHostingView sizzling workaround to disabled safeAreaInsets. #745
• Fixing: UIHostingController does not automatically resize to hug subviews in iOS 15.0 #759

Visual Verification

Before	After

Pull request checklist

This PR has considered:

• Light and Dark appearances
• iOS supported versions (all major versions greater than or equal current target deployment version)
• VoiceOver and Keyboard Accessibility
• Internationalization and Right to Left layouts
• Different resolutions (1x, 2x, 3x)
• Size classes and window sizes (iPhone vs iPad, notched devices, multitasking, different window sizes, etc)
• iPad Pointer interaction
• SwiftUI consumption (validation or new demo scenarios needed)
• Objective-C exposure (provide it only if needed)

Microsoft Reviewers: Open in CodeFlow

[huwilkes]

Looks like the nav bar in 15 regressed, investigating alternative fix

[huwilkes]

Looks like the nav bar in 15 regressed, investigating alternative fix

Went with deprecation, and using just UIHostingController in iOS 16. Once we drop iOS 14 and 15, we should be able to just delete the file again.