taler-ios

iOS apps for GNU Taler (wallet)
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View+DeviceRotation.swift (2629B)

      1 /* MIT License
      2  * Copyright (c) 2021 Paul Hudson
      3  * https://www.hackingwithswift.com/quick-start/swiftui/how-to-detect-device-rotation
      4  *
      5  * Permission is hereby granted, free of charge, to any person obtaining a copy
      6  * of this software and associated documentation files (the "Software"), to deal
      7  * in the Software without restriction, including without limitation the rights
      8  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
      9  * copies of the Software, and to permit persons to whom the Software is
     10  * furnished to do so, subject to the following conditions:
     11  *
     12  * The above copyright notice and this permission notice shall be included in all
     13  * copies or substantial portions of the Software.
     14  *
     15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
     18  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
     21  * SOFTWARE.
     22  */
     23 /**
     24  * @author Marc Stibane
     25  */
     26 
     27 import SwiftUI
     28 
     29 // Custom view modifier to track rotation and call our action
     30 struct DeviceRotationViewModifier: ViewModifier {
     31     let action: (UIDeviceOrientation) -> Void
     32 
     33     func body(content: Content) -> some View {
     34         content
     35             .onAppear()     // SwiftUI bug: view modifiers do not work with onReceive() unless you first add onAppear()
     36             .onReceive(NotificationCenter.default.publisher(for: UIDevice.orientationDidChangeNotification)) { _ in
     37                 action(UIDevice.current.orientation)
     38             }
     39     }
     40 }
     41 
     42 // A View wrapper to make the modifier easier to use
     43 extension View {
     44     func onRotate(perform action: @escaping (UIDeviceOrientation) -> Void) -> some View {
     45         self.modifier(DeviceRotationViewModifier(action: action))
     46     }
     47 }
     48 
     49 // Use like this:
     50 //
     51 //struct ContentView: View {
     52 //    @State private var orientation = UIDeviceOrientation.unknown
     53 //
     54 //    var body: some View {
     55 //        Group {
     56 //            if orientation.isPortrait {
     57 //                Text("Portrait")
     58 //            } else if orientation.isLandscape {
     59 //                Text("Landscape")
     60 //            } else if orientation.isFlat {
     61 //                Text("Flat")
     62 //            } else {
     63 //                Text("Unknown")
     64 //            }
     65 //        }
     66 //        .onRotate { newOrientation in
     67 //            orientation = newOrientation
     68 //        }
     69 //    }
     70 //}