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42 lines
1.3 KiB
Swift
42 lines
1.3 KiB
Swift
//
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// Copyright 2021 New Vector Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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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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