add file picker (hopefully fixes esign?)

Pocket Poster/Views/FilePicker/FilePicker.swift

@@ -0,0 +1,72 @@
+//
+//  FilePicker.swift
+//  Pocket Poster
+//
+//  Created by lemin on 6/1/25.
+//
+
+
+//  FilePicker.swift
+//
+//  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 FilePicker<LabelView: View>: View {
+    public typealias PickedURLsCompletionHandler = (_ urls: [URL]) -> Void
+    public typealias LabelViewContent = () -> LabelView
+    
+    @State private var isPresented: Bool = false
+    
+    public let types: [UTType]
+    public let allowMultiple: Bool
+    public let pickedCompletionHandler: PickedURLsCompletionHandler
+    public let labelViewContent: LabelViewContent
+    
+    public init(types: [UTType], allowMultiple: Bool, onPicked completionHandler: @escaping PickedURLsCompletionHandler, @ViewBuilder label labelViewContent: @escaping LabelViewContent) {
+        self.types = types
+        self.allowMultiple = allowMultiple
+        self.pickedCompletionHandler = completionHandler
+        self.labelViewContent = labelViewContent
+    }
+
+    public init(types: [UTType], allowMultiple: Bool, title: String, onPicked completionHandler: @escaping PickedURLsCompletionHandler) where LabelView == Text {
+        self.init(types: types, allowMultiple: allowMultiple, onPicked: completionHandler) { Text(title) }
+    }
+    
+    public var body: some View {
+        Button(
+            action: {
+                if !isPresented { isPresented = true }
+            },
+            label: {
+                labelViewContent()
+            }
+        )
+        .disabled(isPresented)
+        .sheet(isPresented: $isPresented) {
+            FilePickerUIRepresentable(types: types, allowMultiple: allowMultiple, onPicked: pickedCompletionHandler)
+        }
+    }
+}