34 lines
860 B
Swift
34 lines
860 B
Swift
//
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// Copyright 2021-2024 New Vector Ltd.
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//
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// SPDX-License-Identifier: AGPL-3.0-only
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// Please see LICENSE in the repository root for full details.
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//
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import Foundation
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import SwiftUI
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/// Used to calculate the frame of a view.
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///
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/// Useful in situations as with `ZStack` where you might want to layout views using alignment guides.
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/// ```
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/// @State private var frame: CGRect = CGRect.zero
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/// ...
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/// SomeView()
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/// .background(ViewFrameReader(frame: $frame))
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/// ```
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struct ViewFrameReader: View {
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@Binding var frame: CGRect
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var body: some View {
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GeometryReader { geometry in
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Color.clear
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.preference(key: FramePreferenceKey.self,
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value: geometry.frame(in: .local))
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}
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.onPreferenceChange(FramePreferenceKey.self) {
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frame = $0
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}
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}
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}
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