应用重新启动时，照片会丢失并取消固定

Question

我正在使用Parse pinInBackground功能来保存稍后将与解析同步的信息，但该信息的一部分是已拍摄的照片，但是当我在信息同步之前重新启动应用时解析，图像丢失。 应用程序重新启动后，如何不丢失图片。 我必须在本地保存吗？如果是这样，在哪里以及如何？ 提前感谢您，如果需要我的任何代码，请告诉我。

//Here I pin the picture in the background
@IBAction func cameraButton(sender: AnyObject) {
    imagePicker = UIImagePickerController()
    imagePicker.delegate = self
    imagePicker.sourceType = .Camera
    presentViewController(imagePicker, animated:true, completion: nil)
}

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {

    let pickedImage:UIImage = info[UIImagePickerControllerOriginalImage] as! UIImage
    let imageData = UIImageJPEGRepresentation(pickedImage, 0.5)
    let imageFile:PFFile = PFFile(data: imageData)


    locationLogs["photo"] = imageFile
    locationLogs.pinInBackgroundWithBlock{ (success: Bool, error: NSError?) -> Void in

        if (success) {
            self.locationManager.stopUpdatingLocation()
        }else{
            println("error= \(error)")
        }
    }
    imagePicker.dismissViewControllerAnimated(true, completion: nil)
}

//Query it 
func queryAll() {
    let query = PFQuery(className:"LocationLogs")

    query.fromLocalDatastore()
    query.findObjectsInBackgroundWithBlock( { (NSArray results, NSError error) in
        if error == nil && results != nil {
            println("array = \(results)" )
            self.tableData = results!
            self.loggedItemsTableView.reloadData()
        }else{
            println("An error has occured= \(error)")
        }
    })
}

//Save and unpin it 
 @IBAction func syncAllButton(sender: AnyObject) {

    PFObject.saveAllInBackground(self.tableData as [AnyObject], block: { (success: Bool, error: NSError?) -> Void in
        if (success) {

            PFObject.unpinAllInBackground(self.tableData as [AnyObject])

            println("Pinned Data has successfully been saved")


        }else{
            println("error= \(error?.localizedDescription)")
        }
    })
}