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SwiftUI - prevent auto dismiss the sheet by drag down
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// | |
// Created by https://quickplan.app on 2020/11/8. | |
// | |
import SwiftUI | |
/// Control if allow to dismiss the sheet by the user actions | |
/// - Drag down on the sheet on iPhone and iPad | |
/// - Tap outside the sheet on iPad | |
/// No impact to dismiss programatically (by calling "presentationMode.wrappedValue.dismiss()") | |
/// ----------------- | |
/// Tested on iOS 14.2 with Xcode 12.2 RC | |
/// This solution may NOT work in the furture. | |
/// ----------------- | |
struct MbModalHackView: UIViewControllerRepresentable { | |
var dismissable: () -> Bool = { false } | |
func makeUIViewController(context: UIViewControllerRepresentableContext<MbModalHackView>) -> UIViewController { | |
MbModalViewController(dismissable: self.dismissable) | |
} | |
func updateUIViewController(_ uiViewController: UIViewController, context: Context) { | |
} | |
} | |
extension MbModalHackView { | |
private final class MbModalViewController: UIViewController, UIAdaptivePresentationControllerDelegate { | |
let dismissable: () -> Bool | |
init(dismissable: @escaping () -> Bool) { | |
self.dismissable = dismissable | |
super.init(nibName: nil, bundle: nil) | |
} | |
required init?(coder: NSCoder) { | |
fatalError("init(coder:) has not been implemented") | |
} | |
override func didMove(toParent parent: UIViewController?) { | |
super.didMove(toParent: parent) | |
setup() | |
} | |
func presentationControllerShouldDismiss(_ presentationController: UIPresentationController) -> Bool { | |
dismissable() | |
} | |
// set delegate to the presentation of the root parent | |
private func setup() { | |
guard let rootPresentationViewController = self.rootParent.presentationController, rootPresentationViewController.delegate == nil else { return } | |
rootPresentationViewController.delegate = self | |
} | |
} | |
} | |
extension UIViewController { | |
fileprivate var rootParent: UIViewController { | |
if let parent = self.parent { | |
return parent.rootParent | |
} | |
else { | |
return self | |
} | |
} | |
} | |
/// make the call the SwiftUI style: | |
/// view.allowAutDismiss(...) | |
extension View { | |
/// Control if allow to dismiss the sheet by the user actions | |
public func allowAutoDismiss(_ dismissable: @escaping () -> Bool) -> some View { | |
self | |
.background(MbModalHackView(dismissable: dismissable)) | |
} | |
/// Control if allow to dismiss the sheet by the user actions | |
public func allowAutoDismiss(_ dismissable: Bool) -> some View { | |
self | |
.background(MbModalHackView(dismissable: { dismissable })) | |
} | |
} | |
/// Example: | |
struct ContentView: View { | |
@State private var presenting = false | |
var body: some View { | |
VStack { | |
Button { | |
presenting = true | |
} label: { | |
Text("Present") | |
} | |
} | |
.sheet(isPresented: $presenting) { | |
ModalContent() | |
.allowAutoDismiss { false } | |
// or | |
// .allowAutoDismiss(false) | |
} | |
} | |
} | |
struct ModalContent: View { | |
@Environment(\.presentationMode) private var presentationMode | |
var body: some View { | |
VStack { | |
Text("Hello") | |
.padding() | |
Button { | |
presentationMode.wrappedValue.dismiss() | |
} label: { | |
Text("Dismiss") | |
} | |
} | |
} | |
} | |
struct ContentView_Previews: PreviewProvider { | |
static var previews: some View { | |
ContentView() | |
} | |
} |
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