ios – UIImagePickerController委托不叫Swift 3

从表面上看,我认为这必须是一个代表问题,但在要求代表后,正确的一个被退回.

我创建了一个ImagePicker类来处理所有UIImagePickerController的东西.在需要调用委托方法之前,每件事都有效.在我选择照片后,imagePicker会解散,但是didFinishPickingMediaWithInfo方法永远不会被调用.请帮忙！谢谢：)

func selectPhoto() {
    imagePicker.delegate = self //Delegate gets set here

    let photoAsk = UIAlertController.init( //Ask user if they want to take picture or choose one
        title: "Edit Profile Picture",message: nil,preferredStyle: .alert)
    let cameraAction = UIAlertAction.init(
        title: "Take Photo",style: .default) { (UIAlertAction) in
            if (UIImagePickerController.isSourceTypeAvailable(.camera)) {
                self.imagePicker.sourceType = .camera
                UIApplication.topViewController()!.present(self.imagePicker,animated: true,completion:nil)
            } else {
                print("Cannot access camera in simulator.")
                return
            }
    }
    let photoLibraryAction = UIAlertAction.init(
        title: "Photo Library",style: .default) { (UIAlertAction) in
            self.imagePicker.sourceType = .photoLibrary
            UIApplication.topViewController()!.present(self.imagePicker,completion:nil)
            print("UIImagePickerDelegate: \(self.imagePicker.delegate.debugDescription)") // <--THIS PRINTS OUT "AppName.ImagePicker: 0x145d7bdf0>",and the class name is ImagePicker
    }
    let cancelAction = UIAlertAction.init(
        title: "Cancel",style: .cancel) { (UIAlertAction) in return }

    photoAsk.addAction(cameraAction)
    photoAsk.addAction(photoLibraryAction)
    photoAsk.addAction(cancelAction)

    imagePicker.mediaTypes = [kUTTypeImage as String]

    UIApplication.topViewController()?.present(photoAsk,completion: nil)
    }
}

永远不会被称为：

func imagePickerController(_ picker: UIImagePickerController,didFinishPickingMediaWithInfo info: [String : Any]) {
    print("Image picked.") //NEVER PRINTS
}

解决方法

细节

Xcode 9.2,Swift 4

解

extension BaseViewController: UIImagePickerControllerDelegate,UINavigationControllerDelegate {

    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
        dismiss(animated: true,completion: nil)
    }

    func imagePickerController(_ picker: UIImagePickerController,didFinishPickingMediaWithInfo info: [String : Any]) {
        NSLog("\(info)")
        let image = info[UIImagePickerControllerOriginalImage] as? UIImage
        imagePickerController(picker,pickedImage: image)
    }

    @objc func imagePickerController(_ picker: UIImagePickerController,pickedImage: UIImage?) {
    }
}

完整样本

BaseViewController.swift

import UIKit

class BaseViewController: UIViewController {

    let imagePicker = UIImagePickerController()

    override func viewDidLoad() {
        super.viewDidLoad()
        imagePicker.delegate = self
    }
}
extension BaseViewController: UIImagePickerControllerDelegate,pickedImage: UIImage?) {
    }
}

ViewController.swift

import UIKit

class ViewController: BaseViewController {

    weak var imageView: UIImageView?

    override func viewDidLoad() {
        super.viewDidLoad()
        let stackView = UIStackView(frame: .zero)
        stackView.axis = .vertical
        stackView.translatesAutoresizingMaskIntoConstraints = false
        view.addSubview(stackView)
        stackView.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
        stackView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true

        let imageView = UIImageView()
        imageView.contentMode = .scaleAspectFit
        imageView.translatesAutoresizingMaskIntoConstraints = false
        stackView.addArrangedSubview(imageView)
        imageView.widthAnchor.constraint(equalToConstant: 200).isActive = true
        imageView.heightAnchor.constraint(equalToConstant: 200).isActive = true
        self.imageView = imageView

        let button = UIButton(frame: .zero)
        button.setTitle("Button",for: .normal)
        button.setTitleColor(.blue,for: .normal)
        button.addTarget(self,action: #selector(showImages),for: .touchUpInside)
        stackView.addArrangedSubview(button)
    }

    @IBAction func showImages(_ sender: AnyObject) {
        imagePicker.allowsEditing = false
        imagePicker.sourceType = .photoLibrary

        present(imagePicker,completion: nil)
    }

    override func imagePickerController(_ picker: UIImagePickerController,pickedImage: UIImage?) {
        if let image = pickedImage {
            imageView?.image = image
            dismiss(animated: true,completion: nil)
        }
    }
}

ios – UIImagePickerController委托不叫Swift 3

解决方法

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