Stefan Lange-Hegermann
695d2ccd75
QLPreviewController only renders its share, print and open-in actions when it is inside a navigation controller, so diagram and report previews were dead ends. Wrap it in one, add an explicit Done button and assert both in a UI test.
68 lines
2.2 KiB
Swift
68 lines
2.2 KiB
Swift
//
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// QuickLookPreview.swift
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// Cable
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//
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import QuickLook
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import SwiftUI
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import UIKit
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/// Presents a single exported file (PDF or PNG) in Quick Look so the user can
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/// inspect it before sharing.
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///
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/// SwiftUI's `quickLookPreview(_:)` modifier is macOS-only, so iOS wraps
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/// `QLPreviewController` directly. The controller only shows its action
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/// buttons — share, print, open in another app — when it sits inside a
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/// navigation controller, so it is wrapped in one and gets an explicit Done
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/// button to close the sheet.
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struct QuickLookPreview: UIViewControllerRepresentable {
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let url: URL
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var onDone: () -> Void
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func makeUIViewController(context: Context) -> UINavigationController {
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let preview = QLPreviewController()
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preview.dataSource = context.coordinator
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preview.navigationItem.leftBarButtonItem = UIBarButtonItem(
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barButtonSystemItem: .done,
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target: context.coordinator,
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action: #selector(Coordinator.done)
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)
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preview.navigationItem.leftBarButtonItem?.accessibilityIdentifier = "quick-look-done-button"
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return UINavigationController(rootViewController: preview)
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}
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func updateUIViewController(_ controller: UINavigationController, context: Context) {
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context.coordinator.onDone = onDone
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guard context.coordinator.url != url as NSURL else { return }
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context.coordinator.url = url as NSURL
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(controller.viewControllers.first as? QLPreviewController)?.reloadData()
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}
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func makeCoordinator() -> Coordinator {
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Coordinator(url: url as NSURL, onDone: onDone)
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}
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// MARK: - Coordinator
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final class Coordinator: NSObject, QLPreviewControllerDataSource {
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var url: NSURL
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var onDone: () -> Void
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init(url: NSURL, onDone: @escaping () -> Void) {
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self.url = url
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self.onDone = onDone
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}
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func numberOfPreviewItems(in controller: QLPreviewController) -> Int { 1 }
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func previewController(_ controller: QLPreviewController, previewItemAt index: Int) -> QLPreviewItem {
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url
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}
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@objc func done() {
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onDone()
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}
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}
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}
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