Swift - ImagePicker不执行委托

Question

我只想在iPhone相机的ImageView中显示一个图像。这是项目的第一步，但不起作用.

这里是我的代码:

import UIKit
import MobileCoreServices

class ViewController: UIViewController,UIImagePickerControllerDelegate, UINavigationControllerDelegate {

    @IBOutlet weak var imageView: UIImageView!
    @IBOutlet weak var scanButton: UIButton!
    @IBOutlet weak var textfield: UITextField!

     let imagePicker = UIImagePickerController()


    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        self.imagePicker.modalPresentationStyle = UIModalPresentationStyle.currentContext
        self.imagePicker.delegate = self
        self.imagePicker.mediaTypes = [kUTTypeImage as String]
        self.imagePicker.sourceType = .camera
        self.imagePicker.allowsEditing = true;


    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    //MARK: - Actions

    @IBAction func scanAction(_ sender: UIButton) {

        print("----- scanAction -----");

        self.present(self.imagePicker, animated: true, completion: nil)
    }


    //MARK: - UIImagePickerControllerDelegate

    private func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {

        print("----- didFinishPickingMediaWithInfo -----");

        var image:UIImage!;
        if let  pickedImage = info[UIImagePickerControllerEditedImage] as? UIImage {
            image = pickedImage;
        }
        else {
            image = info[UIImagePickerControllerOriginalImage] as! UIImage;
        }

        self.imageView.image = image;


        dismiss(animated: true, completion: nil)
    }

    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
        print("----- imagePickerControllerDidCancel -----");

        dismiss(animated: true, completion: nil)
    }

}

我看到了动作按钮的打印，但是我从来没有看到下面的那个：

print("----- didFinishPickingMediaWithInfo -----");

我以前已经做过这样的imagePicker了，所以我不明白为什么它不能工作。

有人能帮帮我吗？

Answer 1

在Swift 3中，信息的类型被更改为[String : Any]，而不是[String : AnyObject]，而且您还没有添加_作为第一个参数标签，所以请像下面这样更改您的方法。

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    print("----- imagePickerControllerDidCancel -----");
}