67 lines
2.5 KiB
Swift
67 lines
2.5 KiB
Swift
#if canImport(AppKit)
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import SwiftUI
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import AppKit
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/// Introspection NSView that is inserted alongside the target view.
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public class IntrospectionNSView: NSView {
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required init() {
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super.init(frame: .zero)
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isHidden = true
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}
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public override func hitTest(_ point: NSPoint) -> NSView? {
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return nil
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}
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@available(*, unavailable)
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required init?(coder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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}
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/// Introspection View that is injected into the UIKit hierarchy alongside the target view.
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/// After `updateNSView` is called, it calls `selector` to find the target view, then `customize` when the target view is found.
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public struct AppKitIntrospectionView<TargetViewType: NSView>: NSViewRepresentable {
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/// Method that introspects the view hierarchy to find the target view.
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/// First argument is the introspection view itself, which is contained in a view host alongside the target view.
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let selector: (IntrospectionNSView) -> TargetViewType?
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/// User-provided customization method for the target view.
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let customize: (TargetViewType) -> Void
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public init(
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selector: @escaping (IntrospectionNSView) -> TargetViewType?,
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customize: @escaping (TargetViewType) -> Void
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) {
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self.selector = selector
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self.customize = customize
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}
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public func makeNSView(context: NSViewRepresentableContext<AppKitIntrospectionView>) -> IntrospectionNSView {
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let view = IntrospectionNSView()
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view.setAccessibilityLabel("IntrospectionNSView<\(TargetViewType.self)>")
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return view
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}
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/// When `updateNSView` is called after creating the Introspection view, it is not yet in the AppKit hierarchy.
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/// At this point, `introspectionView.superview.superview` is nil and we can't access the target AppKit view.
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/// To workaround this, we wait until the runloop is done inserting the introspection view in the hierarchy, then run the selector.
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/// Finding the target view fails silently if the selector yield no result. This happens when `updateNSView`
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/// gets called when the introspection view gets removed from the hierarchy.
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public func updateNSView(
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_ nsView: IntrospectionNSView,
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context: NSViewRepresentableContext<AppKitIntrospectionView>
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) {
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DispatchQueue.main.async {
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guard let targetView = self.selector(nsView) else {
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return
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}
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self.customize(targetView)
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}
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}
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}
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#endif
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