DocumentPickerDelegate更新到Swift 3后不起作用

Question

我试图放置一个documentpicker从iCloud获取文件，但实际上我的应用程序打开了documentMenu以导入文件（iCloud，dropbox），当我选择iCloud时，我介绍用我的文件记录选择器。当我将文件委派给DocumentPicker（_ ...）[documentpicker.delegate = self.delegate]函数永远不会被调用，因为我的类不符合协议

import UIKit
class ImportKeyViewController: UIViewController{
    @IBOutlet weak var openWithLabel: UILabel!
    @IBOutlet weak var transparentBackgroundView: UIView!
    @IBOutlet weak var iCloudButton: UIButton!
    @IBOutlet weak var iTunesButton: UIButton!
    weak var delegate : UIDocumentPickerDelegate?
    func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentAt url: URL){
        print("Entre a documentPicker")
    }
    func documentPickerWasCancelled(_ controller: UIDocumentPickerViewController) {
       print("Sali a documentPicker")
    }
    override func viewDidLoad() {
        super.viewDidLoad()
        print("llegue")
        setUpUI()
    }
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        UIView.animate(withDuration: 0.1, animations: {
            self.transparentBackgroundView.backgroundColor = UIColor(red: 220/255, green: 220/255, blue: 220/255, alpha: 0.7)
        })
    }
    override func viewWillDisappear(_ animated: Bool) {
        UIView.animate(withDuration: 0.1, animations: {
            self.transparentBackgroundView.backgroundColor = UIColor.clear
        })
    }
    @IBAction func closeButtonAction(_ sender: UIButton) {
        let documentPicker = UIDocumentPickerViewController (documentTypes: ["public.text","public.content"], in: .import)
        documentPicker.delegate? = self.delegate!
        self.present(documentPicker, animated:true, completion: nil)
    }
}

我对uidocumentpickerdelegate的强制性和可选方法，但它无法正常工作，如您在下面的图片中所看到的那样

这是我的第一个iOS应用程序，希望您能帮助我。

Answer 1

您应该添加didPickDocumentAt:委托方法的新语法，看起来好像已经更改了。

- 编辑

您的ImportKeyViewController应继承UIDocumentPickerDelegate。做到这一点的好方法是创建一个扩展，这样很容易就可以明显地委托方法，而您的方法是什么。

喜欢：

extension ImportKeyViewController: UIDocumentPickerDelegate {
    func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentAt url: URL){
        print("Entre a documentPicker")
    }
    func documentPickerWasCancelled(_ controller: UIDocumentPickerViewController) {
       print("Sali a documentPicker")
    }
}