i am using AWSLocal content upload method to upload file,
i need to cancel uploading from another screen here is the uploading function :
private func uploadLocalContent(localContent: AWSLocalContent) { localContent.uploadWithPinOnCompletion(false, progressBlock: {[weak self](content: AWSLocalContent?, progress: NSProgress?) -> Void in guard let strongSelf = self else { return } dispatch_async(dispatch_get_main_queue()) { // Update the upload UI if it is a new upload and the table is not yet updated if(strongSelf.tableView.numberOfRowsInSection(0) == 0 || strongSelf.tableView.numberOfRowsInSection(0) < strongSelf.manager.uploadingContents.count) { strongSelf.updateUploadUI() } else { for uploadContent in strongSelf.manager.uploadingContents { if uploadContent.key == content?.key { let index = strongSelf.manager.uploadingContents.indexOf(uploadContent)! let indexPath = NSIndexPath(forRow: index, inSection: 0) strongSelf.tableView.reloadRowsAtIndexPaths([indexPath], withRowAnimation: .None) } } } } }, completionHandler: {[weak self](content: AWSContent?, error: NSError?) -> Void in guard let strongSelf = self else { return } strongSelf.updateUploadUI() if let error = error { print("Failed to upload an object. \(error)") strongSelf.showSimpleAlertWithTitle("Error", message: "Failed to upload an object.", cancelButtonTitle: "OK") } else { strongSelf.refreshContents() } }) updateUploadUI() } 
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