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SwiftUI anchorPreference .leading misbehaving?
I'm trying to use .anchorPreference's .leading source, but I'm seeing some unexpected behavior for right-to-left layout. Given the following playground I would expect the blue color's .leading anchor to always be in the middle of the view, but for right-to-left layout it's at 0.0. That's the behavior I'd expect from a .left anchor rather than a .leading anchor. Am I misunderstanding something? import PlaygroundSupport import SwiftUI struct AnchorPreferenceKey: PreferenceKey { static let defaultValue: Anchor<CGPoint>? = nil static func reduce(value: inout Anchor<CGPoint>?, nextValue: () -> Anchor<CGPoint>?) { fatalError() // There can be only one } } struct ContentView: View { @Environment(\.layoutDirection) var layoutDirection var body: some View { HStack(spacing: 0) { Color.green Color.blue.anchorPreference(key: AnchorPreferenceKey.self, value: .leading) { $0 } } .overlayPreferenceValue(AnchorPreferenceKey.self) { anchor in GeometryReader { proxy in Color.clear.onAppear { print(layoutDirection, "Blue Leading", proxy[anchor!].x) // leftToRight Blue Leading 150.0 // rightToLeft Blue Leading 0.0 } } } } } PlaygroundPage.current.setLiveView( VStack { ContentView() .overlay(Text("Left to Right")) .environment(\.layoutDirection, .leftToRight) ContentView() .overlay(Text("Right to Left")) .environment(\.layoutDirection, .rightToLeft) } .frame(width: 300, height: 100) )
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Mar ’22