UIImagePickerController与LongPressGesture一起崩溃

Question

今天，我意识到当我将UIImagePickerController与一个按钮一起使用时，它可以正常工作。但是，当我想通过LongPressGesture呈现它时，该应用程序在运行时崩溃。为什么这样？

操作：

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

委托：

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

长手势具有状态

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