ios - 捕获两个图像并将其显示到两个 UIImageView

Question

我计划拍摄两张个人资料照片，两张照片在同一个 View Controller 上都有自己单独的按钮和 ImageView 。

为此，我使用 Swift 版本 4。

class ViewController: UIViewController, UINavigationControllerDelegate, UIImagePickerControllerDelegate {

  @IBOutlet weak var profileA: UIImageView!
  @IBOutlet weak var profileB: UIImageView!

  var profileAPicker: UIImagePickerController!
  var profileBPicker: UIImagePickerController!

  func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {

    profileAPicker.dismiss(animated: true, completion: nil)
    profileA.image = info[.originalImage] as? UIImage

    profileBPicker.dismiss(animated: true, completion: nil)
    profileB.image = info[.originalImage] as? UIImage
  }

  @IBAction func takeProfileA(_ sender: Any) {

    profileAPicker = UIImagePickerController()
    profileAPicker.delegate = self
    profileAPicker.sourceType = .camera

    present(profileAPicker, animated: true , completion: nil)
  }

  @IBAction func takeProfileB(_ sender: Any) {

    profileBPicker = UIImagePickerController()
    profileBPicker.delegate = self
    profileBPicker.sourceType = .camera

    present(profileBPicker, animated: true , completion: nil)
  }

}

当我为 profileA 拍照时它可以工作，但当我为 profileB 拍照时它就停止了。

Answer 1

你的方法是不正确的。您的代码对两个隐式解包的选项调用 dismiss ，而不考虑属性是否已设置。

您不需要任何图像选择器属性。只需跟踪要更新的 ImageView 即可。

class ViewController: UIViewController, UINavigationControllerDelegate, UIImagePickerControllerDelegate {
  @IBOutlet weak var profileA: UIImageView!
  @IBOutlet weak var profileB: UIImageView!

  var currentImageView: UIImageView?

  func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
    picker.dismiss(animated: true, completion: nil)

    currentImageView?.image = info[.originalImage] as? UIImage
  }

  @IBAction func takeProfileA(_ sender: Any) {
    let picker = UIImagePickerController()
    picker.delegate = self
    picker.sourceType = .camera
    currentImageView = profileA

    present(picker, animated: true , completion: nil)
  }

  @IBAction func takeProfileB(_ sender: Any) {
    let picker = UIImagePickerController()
    picker.delegate = self
    picker.sourceType = .camera
    currentImageView = profileB

    present(picker, animated: true , completion: nil)
  }

}