I added to my app On-Demand Resources and posted to app store. Part of my users has trouble, a block completionHandler called when the resources have finished downloading doesn't occurs. It doesn't deppend on disc space. In most cases it works right.
Once I have the same truoble, I reset my iPhone content, reinstll app, and trouble is left.
- (void) viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
NSSet *tags = [NSSet setWithObjects: self.exerciseId, nil];
resourceRequest = [[NSBundleResourceRequest alloc] initWithTags:tags];
[resourceRequest conditionallyBeginAccessingResourcesWithCompletionHandler:
^(BOOL resourcesAvailable)
{
if (resourcesAvailable) {
dispatch_async(dispatch_get_main_queue(), ^{
[self setupMoviePlayerVideoWithName:_exerciseId];
});
}
else {
[self tryToGetODR];
}
}];
}
-(void) tryToGetODR{
resourceRequest.loadingPriority = NSBundleResourceRequestLoadingPriorityUrgent;
[resourceRequest beginAccessingResourcesWithCompletionHandler: ^(NSError * __nullable error){
dispatch_async(dispatch_get_main_queue(), ^{
if (error) {
return;
}
[self.videoImageView setHidden:true];
[self.activityIndikator setHidden:true];
[self.downloadProgressLabel setHidden:true];
[self setupMoviePlayerVideoWithName:_exerciseId];
});
}];
}
Anybody faced with similar?
The sporadic nature of the problem is immediately suggestive of a threading issue. And indeed, you have one. Change:
else {
[self tryToGetODR];
}
to:
else {
dispatch_async(dispatch_get_main_queue(), ^{
[self tryToGetODR];
});
}
Otherwise (among other bad things) you are trying to access resourceRequest and launch the non-conditional access on a background thread. This means you don't give the first request (the conditional request) a chance to complete.