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Add FramePreferenceKey for use in ViewFrameReader.
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3 changed files with 35 additions and 5 deletions
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//
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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 SwiftUI
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/// A SwiftUI `PreferenceKey` for `CGRect` values such as a view's frame.
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@available(iOS 14.0, *)
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struct FramePreferenceKey: PreferenceKey {
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static var defaultValue: CGRect = .zero
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static func reduce(value: inout CGRect, nextValue: () -> CGRect) {
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value = nextValue()
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}
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}
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@ -31,11 +31,13 @@ struct ViewFrameReader: View {
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@Binding var frame: CGRect
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var body: some View {
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GeometryReader { geo -> Color in
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DispatchQueue.main.async {
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frame = geo.frame(in: .local)
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}
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return .clear
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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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1
changelog.d/4974.change
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1
changelog.d/4974.change
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SwiftUI: Add FramePreferenceKey for use in ViewFrameReader.
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