Opening Finder using Mac Catalyst - swift

Question

I'm trying to open the finder using Mac Catalyst and get images.
At first, I tried the below code, but Xcode says 'NSOpenPanel' is unavailable in Mac Catalyst .
private func selectFile() {
NSOpenPanel.openImage { (result) in
if case let .success(image) = result {
self.image = image
}
}
}
So I tried this solution, this time Compile was successful, but when I click the button to open finder I got this error message: Thread 1: EXC_BREAKPOINT (code=EXC_I386_BPT, subcode=0x0)
My Final Code is below
import SwiftUI
struct ContentView: View {
var body: some View {
VStack{
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)
}
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
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()
}
}
How can I solve this issue?

Answer 1

In my macCatalyst app, I use a UIViewControllerRepresentable to show a UIDocumentPickerViewController
#Binding to your main view so you can reference that data from the selected file
struct DocumentImportViewController: UIViewControllerRepresentable {
#Binding var imgData:Data! //This doesn't need to be a "Data"
func makeCoordinator() -> Coordinator {
return Coordinator(self)
}
func makeUIViewController(context: UIViewControllerRepresentableContext<DocumentImportViewController>) -> UIDocumentPickerViewController {
let vc = UIDocumentPickerViewController(forOpeningContentTypes: [.image], asCopy: true)
vc.delegate = context.coordinator
return vc
}
func updateUIViewController(_ uiViewController: UIDocumentPickerViewController, context: UIViewControllerRepresentableContext<DocumentImportViewController>) {
}
}
Coordinator for delegates
extension DocumentImportViewController{
class Coordinator: NSObject, UIDocumentPickerDelegate {
var parent: DocumentImportViewController
init(_ parent: DocumentImportViewController) {
self.parent = parent
}
func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentsAt urls: [URL]) {
parent.imgData = //get image from url
}
}}