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...a helper view that makes it easier to embed UIHostingControllers in a parent view. Pass a parent controller into the initalizer, along with the UIHostingController. It will add the UIHostingController to the parent controller, and remove the UIHostingController from the parent controller when the UIView is deinitialized. This should make it easier for us to embed SwiftUI views in the block editor. Part of epic #214.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| // | ||
| // UIHostingView.swift | ||
| // Subconscious (iOS) | ||
| // | ||
| // Created by Gordon Brander on 11/2/23. | ||
| // | ||
|
|
||
| import Foundation | ||
| import SwiftUI | ||
| import UIKit | ||
|
|
||
| // See here for another approach https://github.com/SwiftUIX/SwiftUIX/blob/master/Sources/Intermodular/Helpers/UIKit/UIHostingView.swift | ||
|
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| // Get a view for a UIHostingController | ||
| // Assigns the UIHostingController to a parent controller | ||
| class UIHostingView<Content: View>: UIView { | ||
| /// A reference to the hosting controller for this UIHostingView. | ||
| /// We use this to remove hostingController from the parent controller | ||
| /// on deinit. | ||
| private var hostingController: UIHostingController<Content> | ||
|
|
||
| init( | ||
| frame: CGRect = .zero, | ||
| parent: UIViewController?, | ||
| hostingController: UIHostingController<Content> | ||
| ) { | ||
| self.hostingController = hostingController | ||
| super.init(frame: frame) | ||
|
|
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| // Add hosting controller to parent controller | ||
| if let parent = parent { | ||
| parent.addChild(hostingController) | ||
| } | ||
|
|
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| // Add hosting controler view to this view | ||
| self.addSubview(hostingController.view) | ||
|
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| // Set hosting controller view constraints to match this view's | ||
| // constraints. | ||
| hostingController.view.translatesAutoresizingMaskIntoConstraints = false | ||
| NSLayoutConstraint.activate([ | ||
| hostingController.view.leadingAnchor.constraint( | ||
| equalTo: self.leadingAnchor | ||
| ), | ||
| hostingController.view.trailingAnchor.constraint( | ||
| equalTo: self.trailingAnchor | ||
| ), | ||
| hostingController.view.topAnchor.constraint( | ||
| equalTo: self.topAnchor | ||
| ), | ||
| hostingController.view.bottomAnchor.constraint( | ||
| equalTo: self.bottomAnchor | ||
| ) | ||
| ]) | ||
|
|
||
| // Notify hosting controller it moved to parent | ||
| // See https://developer.apple.com/documentation/uikit/view_controllers/creating_a_custom_container_view_controller | ||
| hostingController.didMove(toParent: parent) | ||
| } | ||
|
|
||
| convenience init( | ||
| frame: CGRect = .zero, | ||
| parent: UIViewController?, | ||
| view: Content | ||
| ) { | ||
| self.init( | ||
| parent: parent, | ||
| hostingController: UIHostingController(rootView: view) | ||
| ) | ||
| } | ||
|
|
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| required init?(coder: NSCoder) { | ||
| fatalError("init(coder:) has not been implemented") | ||
| } | ||
|
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| deinit { | ||
| guard hostingController.parent != nil else { | ||
| return | ||
| } | ||
| hostingController.willMove(toParent: nil) | ||
| hostingController.view.removeFromSuperview() | ||
| hostingController.removeFromParent() | ||
| } | ||
| } | ||
|
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| struct UIHostingView_Previews: PreviewProvider { | ||
| static var previews: some View { | ||
| UIViewPreviewRepresentable { | ||
| UIHostingView( | ||
| parent: nil, | ||
| view: Text("Hello from SwiftUI") | ||
| ) | ||
| } | ||
| } | ||
| } |
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