add file picker (hopefully fixes esign?)

Pocket Poster/Views/FilePicker/FilePickerUIRepresentable.swift

@@ -0,0 +1,77 @@
+//
+//  FilePickerUIRepresentable.swift
+//  Pocket Poster
+//
+//  Created by lemin on 6/1/25.
+//
+
+
+//  FilePicker Package
+//
+//  MIT License
+//
+//  Copyright (c) 2021 Mark Renaud
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in all
+//  copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+//  SOFTWARE.
+
+import SwiftUI
+import UniformTypeIdentifiers
+
+public struct FilePickerUIRepresentable: UIViewControllerRepresentable {
+    public typealias UIViewControllerType = UIDocumentPickerViewController
+    public typealias PickedURLsCompletionHandler = (_ urls: [URL]) -> Void
+    
+    @Environment(\.presentationMode) var presentationMode
+    
+    public let types: [UTType]
+    public let allowMultiple: Bool
+    public let pickedCompletionHandler: PickedURLsCompletionHandler
+    
+    public init(types: [UTType], allowMultiple: Bool, onPicked completionHandler: @escaping PickedURLsCompletionHandler) {
+        self.types = types
+        self.allowMultiple = allowMultiple
+        self.pickedCompletionHandler = completionHandler
+    }
+    
+    public func makeCoordinator() -> Coordinator {
+        Coordinator(parent: self)
+    }
+    
+    public func makeUIViewController(context: Context) -> UIDocumentPickerViewController {
+        let picker = UIDocumentPickerViewController(forOpeningContentTypes: types, asCopy: true)
+        picker.delegate = context.coordinator
+        picker.allowsMultipleSelection = allowMultiple
+        return picker
+    }
+    
+    public func updateUIViewController(_ controller: UIDocumentPickerViewController, context: Context) {}
+    
+    public class Coordinator: NSObject, UIDocumentPickerDelegate {
+        var parent: FilePickerUIRepresentable
+        
+        init(parent: FilePickerUIRepresentable) {
+            self.parent = parent
+        }
+        
+        public func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentsAt urls: [URL]) {
+            parent.pickedCompletionHandler(urls)
+            parent.presentationMode.wrappedValue.dismiss()
+        }
+    }
+}