问Swift 4中的UIImagePickerController内存泄漏Xcode 9

EN

@IBAction func showImagePickerForPhotoPicker(_ sender: UIBarButtonItem) {
    showImagePicker(sourceType: UIImagePickerControllerSourceType.photoLibrary, button: sender)
}

fileprivate func showImagePicker(sourceType: UIImagePickerControllerSourceType, button: UIBarButtonItem) {
    // If the image contains multiple frames, stop animating.
    if (imageView?.isAnimating)! {
        imageView?.stopAnimating()
    }
    if capturedImages.count > 0 {
        capturedImages.removeAll()
    }

    imagePickerController.sourceType = sourceType
    imagePickerController.modalPresentationStyle =
        (sourceType == UIImagePickerControllerSourceType.camera) ?
            UIModalPresentationStyle.fullScreen : UIModalPresentationStyle.popover

    let presentationController = imagePickerController.popoverPresentationController
    presentationController?.barButtonItem = button   // Display popover from the UIBarButtonItem as an anchor.
    presentationController?.permittedArrowDirections = UIPopoverArrowDirection.any

    if sourceType == UIImagePickerControllerSourceType.camera {
        // The user wants to use the camera interface. Set up our custom overlay view for the camera.
        imagePickerController.showsCameraControls = false

        // Apply our overlay view containing the toolar to take pictures in various ways.
        overlayView?.frame = (imagePickerController.cameraOverlayView?.frame)!
        imagePickerController.cameraOverlayView = overlayView
    }

    present(imagePickerController, animated: true, completion: {
        // Done presenting.
    })
}

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    let image = info[UIImagePickerControllerOriginalImage]
    capturedImages.append(image as! UIImage)

    if !cameraTimer.isValid {
        // Timer is done firing so Finish up until the user stops the timer from taking photos.
        finishAndUpdate()
    } else {
        dismiss(animated: true, completion: nil)
    }
}

func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
    dismiss(animated: true, completion: {
        // Done cancel dismiss of image picker.
    })
}

fileprivate func finishAndUpdate() {
    dismiss(animated: true, completion: { [weak self] in
        guard let `self` = self else {
            return
        }

        if `self`.capturedImages.count > 0 {
            if self.capturedImages.count == 1 {
                // Camera took a single picture.
                `self`.imageView?.image = `self`.capturedImages[0]
            } else {
                // Camera took multiple pictures; use the list of images for animation.
                `self`.imageView?.animationImages = `self`.capturedImages
                `self`.imageView?.animationDuration = 5    // Show each captured photo for 5 seconds.
                `self`.imageView?.animationRepeatCount = 0   // Animate forever (show all photos).
                `self`.imageView?.startAnimating()
            }

            // To be ready to start again, clear the captured images array.
            `self`.capturedImages.removeAll()
        }
    })
}