Reorganize AltStore project into UIKit and SwiftUI folders

AltStore/SwiftUI/View Extensions/UIView Representables/DocumentPicker.swift

@@ -0,0 +1,52 @@
+//
+//  DocumentPicker.swift
+//  SideStore
+//
+//  Created by Fabian Thies on 20.12.22.
+//  Copyright © 2022 SideStore. All rights reserved.
+//
+
+import UIKit
+import SwiftUI
+
+struct DocumentPicker: UIViewControllerRepresentable {
+    internal class Coordinator: NSObject {
+        var parent: DocumentPicker
+        
+        init(_ parent: DocumentPicker) {
+            self.parent = parent
+        }
+    }
+    
+    @Binding var selectedUrl: URL?
+    let supportedTypes: [String]
+    
+    func makeCoordinator() -> Coordinator {
+        Coordinator(self)
+    }
+    
+    func makeUIViewController(context: Context) -> some UIViewController {
+        
+        let documentPickerViewController = UIDocumentPickerViewController(documentTypes: supportedTypes, in: .import)
+        documentPickerViewController.delegate = context.coordinator
+        return documentPickerViewController
+    }
+    
+    func updateUIViewController(_ uiViewController: UIViewControllerType, context: Context) {}
+}
+
+extension DocumentPicker.Coordinator: UIDocumentPickerDelegate {
+    
+    func documentPickerWasCancelled(_ controller: UIDocumentPickerViewController) {
+        self.parent.selectedUrl = nil
+    }
+    
+    func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentsAt urls: [URL]) {
+        
+        guard let firstURL = urls.first else {
+            return
+        }
+        
+        self.parent.selectedUrl = firstURL
+    }
+}