func imagePickerController（_ picker：UIImagePickerController，didFinishPickingMediaWithInfo info：[String：Any]）segfault

Question

我正试图拍一张照片，我稍后会发送给一个宁静的服务。调试我发现当它退出imagePickerController函数时会产生段错误。

代码如下：

 extension ViewController{
        func imagePickerControllerDidCancel(_ picker: 
    UIImagePickerController) {
        picker.dismiss(animated: true)
    }
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any])  {
        let selectedImage: UIImage? = info[UIImagePickerControllerEditedImage] as? UIImage

        let originalImage: UIImage? = info[UIImagePickerControllerOriginalImage] as? UIImage
      let imageData:Data = UIImagePNGRepresentation(originalImage!)!
          let imageStr = imageData.base64EncodedData()
          if let smallShoeImage = UIImageJPEGRepresentation(originalImage!, 0.1) {
        print ("smallShoeImage = ", smallShoeImage)
        SendImagetoML(shoeImage: originalImage!)
        picker.dismiss(animated: true, completion: nil)
    }


}//imagePickerController

func popoverPresentationControllerDidDismissPopover(_ popoverPresentationController: UIPopoverPresentationController) {
    view.alpha = 1.0
}
} //extension

如果我注释掉了imagePickerController中的所有内容，它仍然会生成一个段错误。

这是段错误： https://imgur.com/gallery/UO3ll

当您离开imagePickerControllerDelegate函数时会发生段错误，但它似乎捕获了图像，我可以在以后使用它，但我认为不应该发生段错误。

我的班级定义如下：

class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate, LoginButtonDelegate{
  var picker = UIImagePickerController()

据我所知，一切都很正常但是当我离开imagePickerController时我得到了segFault所以我一定错过了什么。我还测试过：

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

但是这是Swift早期版本的委托，如果我使用它，它永远不会被调用。带有XCode 9.1的iOS 11（iOS 11所需的版本必须升级）。

任何提示都非常感谢。