首页新增打开文件入口

Note/ViewController.swift

@@ -6,6 +6,7 @@
 //
 
 import UIKit
+import UniformTypeIdentifiers
 
 class ViewController: UIViewController {
 
@@ -21,7 +22,8 @@ class ViewController: UIViewController {
         [
             MenuItem(icon: "note.text", iconColor: .systemYellow, title: "打开备忘录"),
             MenuItem(icon: "doc.text", iconColor: .systemBlue, title: "格式化日志"),
-            MenuItem(icon: "text.alignleft", iconColor: .systemGreen, title: "格式化笔记")
+            MenuItem(icon: "text.alignleft", iconColor: .systemGreen, title: "格式化笔记"),
+            MenuItem(icon: "folder", iconColor: .systemOrange, title: "打开文件")
         ]
     ]
 
@@ -94,6 +96,8 @@ extension ViewController: UITableViewDelegate {
         case "格式化笔记":
             let viewController = FormatNoteViewController()
             navigationController?.pushViewController(viewController, animated: true)
+        case "打开文件":
+            openFiles()
         default:
             break
         }
@@ -104,4 +108,37 @@ extension ViewController: UITableViewDelegate {
         guard UIApplication.shared.canOpenURL(url) else { return }
         UIApplication.shared.open(url, options: [:], completionHandler: nil)
     }
+
+    private func openFiles() {
+        let documentPicker = UIDocumentPickerViewController(forOpeningContentTypes: [.item], asCopy: true)
+        documentPicker.delegate = self
+        documentPicker.allowsMultipleSelection = false
+        present(documentPicker, animated: true)
+    }
+}
+
+extension ViewController: UIDocumentPickerDelegate {
+
+    func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentsAt urls: [URL]) {
+        guard let url = urls.first else { return }
+        let fileName = url.lastPathComponent
+
+        var message: String?
+        if let data = try? Data(contentsOf: url),
+           let text = String(data: data, encoding: .utf8),
+           !text.isEmpty {
+            message = text
+        } else {
+            let attributes = try? FileManager.default.attributesOfItem(atPath: url.path)
+            let size = attributes?[.size] as? Int64 ?? 0
+            message = "无法以文本预览\n大小: \(size) 字节"
+        }
+
+        let alert = UIAlertController(title: fileName, message: message, preferredStyle: .alert)
+        alert.addAction(UIAlertAction(title: "确定", style: .default))
+        present(alert, animated: true)
+    }
+
+    func documentPickerWasCancelled(_ controller: UIDocumentPickerViewController) {
+    }
 }