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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,42 @@ | ||
| import SwiftUI | ||
|
|
||
| @available(iOS 13.0, macOS 10.15, watchOS 6.0, tvOS 13.0, *) | ||
| public extension View { | ||
| func readSize( | ||
| onChange: @escaping (CGSize) -> Void | ||
| ) -> some View { | ||
| readFrame(in: .local) { onChange($0.size) } | ||
| } | ||
|
|
||
| func readFrame( | ||
| in coordinateSpace: CoordinateSpace, | ||
| onChange: @escaping (CGRect) -> Void | ||
| ) -> some View { | ||
| background( | ||
| GeometryReader { geometryProxy in | ||
| Color.clear | ||
| .preference(key: FramePreferenceKey.self, value: geometryProxy.frame(in: coordinateSpace)) | ||
| } | ||
| ) | ||
| .onPreferenceChange(FramePreferenceKey.self, perform: onChange) | ||
| } | ||
| } | ||
|
|
||
| private struct FramePreferenceKey: PreferenceKey { | ||
| static var defaultValue: CGRect = .zero | ||
| static func reduce(value: inout CGRect, nextValue: () -> CGRect) { } | ||
| } | ||
|
|
||
| @available(iOS 13.0, macOS 10.15, watchOS 6.0, tvOS 13.0, *) | ||
| #Preview { | ||
| Text("Hello, World!") | ||
| .readSize { | ||
| print("Size:", $0) | ||
| } | ||
| .readFrame(in: .local) { | ||
| print("Local frame:", $0) | ||
| } | ||
| .readFrame(in: .global) { | ||
| print("Global frame:", $0) | ||
| } | ||
| } |