UIImagePickerController 与 LongPressGesture 崩溃

Question

今天我意识到当我将 UIImagePickerController 与按钮一起使用时，它工作正常。但是，当我想通过 LongPressGesture 呈现它时，应用程序会在运行时崩溃。为什么会这样？

行动：

@IBAction func ppLongPressed(_ sender: UILongPressGestureRecognizer) {
    imagePicker.delegate = self
    imagePicker.sourceType = .photoLibrary
    present(imagePicker, animated: true, completion: nil)
}

代表：

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    if let image = info[UIImagePickerControllerOriginalImage] as? UIImage {
        self.profileImage.image = image

    }
    dismiss(animated: true, completion: nil)
}

Answer 1

长手势有状态

@IBAction func ppLongPressed(_ sender: UILongPressGestureRecognizer) {
    if sender.state != .began { return }
    imagePicker.delegate = self
    imagePicker.sourceType = .photoLibrary
    present(imagePicker, animated: true, completion: nil)
}