Created
September 15, 2020 06:18
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Reading size changes
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| struct SizePreferenceKey: PreferenceKey { | |
| static var defaultValue: CGSize = .zero | |
| static func reduce(value: inout CGSize, nextValue: () -> CGSize) {} | |
| } | |
| extension View { | |
| func readSize(onChange: @escaping (CGSize) -> Void) -> some View { | |
| background( | |
| GeometryReader { geometryProxy in | |
| Color.clear | |
| .preference(key: SizePreferenceKey.self, value: geometryProxy.size) | |
| } | |
| ) | |
| .onPreferenceChange(SizePreferenceKey.self, perform: onChange) | |
| } | |
| } |
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