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As hacky as this is, I found that briefly suspending and resuming the download task gets progress events firing again. I do this in response to UIApplicationDidBecomeActiveNotification. I'm not sure if all the thread dispatching is necessary but it gets the job done. [self.sharedBackgroundSession getAllTasksWithCompletionHandler:^(NSArray<__kindof NSURLSessionTask *> * _Nonnull tasks) {
for (NSURLSessionTask *sessionTask in tasks)
{
if (sessionTask.state == NSURLSessionTaskStateRunning)
{
dispatch_async(dispatch_get_main_queue(), ^{
[sessionTask suspend];
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
[sessionTask resume];
});
});
}
}
}];Tested on physical devices running iOS 12.4.6 and 13.4.