问题
NSOpenPanel is not available on platform "UIKit for Mac": https://developer.apple.com/documentation/appkit/nsopenpanel
If Apple doesn't provide a built-in way, I guess someone will create a library based on SwiftUI and FileManager that shows the dialog to select files.
回答1:
Here's a solution to select a file for macOS with Catalyst & UIKit
In your swiftUI view :
Button("Choose file") {
let picker = DocumentPickerViewController(
supportedTypes: ["log"],
onPick: { url in
print("url : \(url)")
},
onDismiss: {
print("dismiss")
}
)
UIApplication.shared.windows.first?.rootViewController?.present(picker, animated: true)
}
The DocumentPickerViewController class :
class DocumentPickerViewController: UIDocumentPickerViewController {
private let onDismiss: () -> Void
private let onPick: (URL) -> ()
init(supportedTypes: [String], onPick: @escaping (URL) -> Void, onDismiss: @escaping () -> Void) {
self.onDismiss = onDismiss
self.onPick = onPick
super.init(documentTypes: supportedTypes, in: .open)
allowsMultipleSelection = false
delegate = self
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
extension DocumentPickerViewController: UIDocumentPickerDelegate {
func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentsAt urls: [URL]) {
onPick(urls.first!)
}
func documentPickerWasCancelled(_ controller: UIDocumentPickerViewController) {
onDismiss()
}
}
回答2:
Both UIDocumentPickerViewController
and UIDocumentBrowserViewController
work in Catalyst. Use them exactly as you would on iOS and they will “magically” appear as standard Mac open/save dialogs.
Nice example here if you need it: https://appventure.me/guides/catalyst/how/open_save_export_import.html
来源:https://stackoverflow.com/questions/56645819/how-to-open-file-dialog-with-swiftui-on-platform-uikit-for-mac