Optimize SwiftUIWrapperView #320
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bryankeller
commented
Nov 9, 2024
| public override var isHidden: Bool { | ||
| didSet { | ||
| if isHidden { | ||
| hostingController.rootView = AnyView(EmptyView()) |
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not ideal, but way faster than the previous strategy of giving every view an ID
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We could also add an API in the future to opt-out of this behavior if someone doesn't need onAppear or onDisappear callbacks in their views, which would get them back ~20% CPU usage when scrolling fast 🤯
bryankeller
commented
Nov 9, 2024
| fileprivate var contentAndID: ContentAndID { | ||
| didSet { | ||
| hostingController.rootView = .init(content: contentAndID.content, id: contentAndID.id) | ||
| hostingController.rootView = AnyView(contentAndID.content) |
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I profiled and there was no perf hit from switching to AnyView
This was referenced Nov 10, 2024
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Details
This PR significantly reduces CPU use for people using SwiftUI views for their calendar items by making 2 optimizations:
UIHostingControlleras a child view controller, and just work with its hosting view directlyonAppearandonDisappearcallbacks - instead, set a hidden view's to just display anEmptyViewTogether, these changes reduce CPU use by 35-40% when scrolling fast.
Related Issue
#299
Motivation and Context
Performance improvements.
How Has This Been Tested
Example app
Types of changes
Checklist