How to detect device rotation in SwiftUI and re-draw view components?
I have a @State variable initialized to the value of UIScreen.main.bounds.width when the first appears. But this value doesn't change when the device orientation changes. I need to redraw all components when the user changes the device orientation.
@dfd provided two good options, I am adding a third one, which is the one I use.
In my case I subclass UIHostingController, and in function viewWillTransition, I post a custom notification.
Then, in my environment model I listen for such notification which can be then used in any view.
struct ContentView: View {
@EnvironmentObject var model: Model
var body: some View {
Group {
if model.landscape {
Text("LANDSCAPE")
} else {
Text("PORTRAIT")
}
}
}
}
In SceneDelegate.swift:
window.rootViewController = MyUIHostingController(rootView: ContentView().environmentObject(Model(isLandscape: windowScene.interfaceOrientation.isLandscape)))
My UIHostingController subclass:
extension Notification.Name {
static let my_onViewWillTransition = Notification.Name("MainUIHostingController_viewWillTransition")
}
class MyUIHostingController<Content> : UIHostingController<Content> where Content : View {
override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
NotificationCenter.default.post(name: .my_onViewWillTransition, object: nil, userInfo: ["size": size])
super.viewWillTransition(to: size, with: coordinator)
}
}
And my model:
class Model: ObservableObject {
@Published var landscape: Bool = false
init(isLandscape: Bool) {
self.landscape = isLandscape // Initial value
NotificationCenter.default.addObserver(self, selector: #selector(onViewWillTransition(notification:)), name: .my_onViewWillTransition, object: nil)
}
@objc func onViewWillTransition(notification: Notification) {
guard let size = notification.userInfo?["size"] as? CGSize else { return }
landscape = size.width > size.height
}
}
There is an easier solution that the one provided by @kontiki, with no need for notifications or integration with UIKit.
In SceneDelegate.swift:
func windowScene(_ windowScene: UIWindowScene, didUpdate previousCoordinateSpace: UICoordinateSpace, interfaceOrientation previousInterfaceOrientation: UIInterfaceOrientation, traitCollection previousTraitCollection: UITraitCollection) {
model.environment.toggle()
}
In Model.swift:
final class Model: ObservableObject {
let objectWillChange = ObservableObjectPublisher()
var environment: Bool = false { willSet { objectWillChange.send() } }
}
The net effect is that the views that depend on the @EnvironmentObject model will be redrawn each time the environment changes, be it rotation, changes in size, etc.
If someone is also interested in the initial device orientation. I did it as follows:
Device.swift
import Combine
final class Device: ObservableObject {
@Published var isLandscape: Bool = false
}
SceneDelegate.swift
class SceneDelegate: UIResponder, UIWindowSceneDelegate {
var window: UIWindow?
// created instance
let device = Device() // changed here
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
// ...
// added the instance as environment object here
let contentView = ContentView().environment(\.managedObjectContext, context).environmentObject(device)
if let windowScene = scene as? UIWindowScene {
// read the initial device orientation here
device.isLandscape = (windowScene.interfaceOrientation.isLandscape == true)
// ...
}
}
// added this function to register when the device is rotated
func windowScene(_ windowScene: UIWindowScene, didUpdate previousCoordinateSpace: UICoordinateSpace, interfaceOrientation previousInterfaceOrientation: UIInterfaceOrientation, traitCollection previousTraitCollection: UITraitCollection) {
device.isLandscape.toggle()
}
// ...
}
I think easy repainting is possible with addition of
@Environment(\.verticalSizeClass) var sizeClass
to View struct.
I have such example:
struct MainView: View {
@EnvironmentObject var model: HamburgerMenuModel
@Environment(\.verticalSizeClass) var sizeClass
var body: some View {
let tabBarHeight = UITabBarController().tabBar.frame.height
return ZStack {
HamburgerTabView()
HamburgerExtraView()
.padding(.bottom, tabBarHeight)
}
}
}
As you can see I need to recalculate tabBarHeight to apply correct bottom padding on Extra View, and addition of this property seems to correctly trigger repainting.
With just one line of code!
I tried some of the previous answers, but had a few problems. One of the solutions would work 95% of the time but would screw up the layout every now and again. Other solutions didn't seem to be in tune with SwiftUI's way of doing things. So I came up with my own solution. You might notice that it combines features of several previous suggestions.
// Device.swift
import Combine
import UIKit
final public class Device: ObservableObject {
@Published public var isLandscape: Bool = false
public init() {}
}
// SceneDelegate.swift
import SwiftUI
class SceneDelegate: UIResponder, UIWindowSceneDelegate {
var window: UIWindow?
var device = Device()
func scene(_ scene: UIScene,
willConnectTo session: UISceneSession,
options connectionOptions: UIScene.ConnectionOptions) {
let contentView = ContentView()
.environmentObject(device)
if let windowScene = scene as? UIWindowScene {
// standard template generated code
// Yada Yada Yada
let size = windowScene.screen.bounds.size
device.isLandscape = size.width > size.height
}
}
// more standard template generated code
// Yada Yada Yada
func windowScene(_ windowScene: UIWindowScene,
didUpdate previousCoordinateSpace: UICoordinateSpace,
interfaceOrientation previousInterfaceOrientation: UIInterfaceOrientation,
traitCollection previousTraitCollection: UITraitCollection) {
let size = windowScene.screen.bounds.size
device.isLandscape = size.width > size.height
}
// the rest of the file
// ContentView.swift
import SwiftUI
struct ContentView: View {
@EnvironmentObject var device : Device
var body: some View {
VStack {
if self.device.isLandscape {
// Do something
} else {
// Do something else
}
}
}
}
