NSOpenPanel - 一切都弃用了吗？

import UIKit
import MobileCoreServices

class ViewController: UIViewController, UIDocumentPickerDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()
        
        let documentPicker = UIDocumentPickerViewController(documentTypes: [kUTTypeText as String], in: .import)
        documentPicker.delegate = self
        present(documentPicker, animated: true, completion: nil)
    }
    
    func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentsAt urls: [URL]) {
        // 用户选择了文件，处理文件
    }
    
    func documentPickerWasCancelled(_ controller: UIDocumentPickerViewController) {
        // 用户取消了选择，处理取消事件
    }
}