Btukfyl

I'm creating a custom view that will be responsible for displaying some text.

BOOL DisplayBiggerString(Item *feedItem, CGFloat contentWidth) {

  StyledString *const tryBiggerString = [feedItem buildBiggerString:[feedItem myStyle]];

  CoreTextView *testTextView = [[CoreTextView alloc] initWithFrame:CGRectMake(0, 0, contentWidth, 0)];

  [testTextView setStyledString:tryBiggerString];

  return testTextView.numberOfLines > 1;

}

It seems that it's crashing on the line:

CoreTextView *testTextView = [[CoreTextView alloc] initWithFrame:CGRectMake(0, 0, contentWidth, 0)];

I'm not sure why it's causing a crashing for that view. The function inside just creates a new view like so:

if (self = [super initWithFrame:CGRectMake(0, 0, width, 1)])

I personally haven't been able to repro this as I can only respond to crash reports I've gotten. I checked the contentWidth and it's just getting the collectionView's width:

CGRectGetWidth(self.collectionView.bounds)

and this is done outside of a dispatch_async call which sizes the string when coming from cache:

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
MakeTextCacheWarmup(newObjects, self.dataSource.feedSectionControllerComponents.itemConfiguration, width, width);

Is there some way to pass some width that would cause this to crash? I've tested all float values and they have seemed fine so far. Or is it a problem to create a view inside of the async block? I never add the view but merely use it to decide the number of lines of text

libobjc.A.dylib objc_msgSend

1CoreFoundation -[__NSSetM addObject:]

2UIKitCore UIViewDidSetNeedsDisplay

3UIKitCore -[UIView _createLayerWithFrame:]

4UIKitCore UIViewCommonInitWithFrame

5UIKitCore -[UIView initWithFrame:]

6MyApp __cmp_gen_92064(MYUserSession+MYMediaUploadManager.m:13)

7+MyApp DisplayBiggerString(MYConsumptionHelpers.m:12)

8+MyApp +[MYFeedItemTextCell buildStyledStringWithFeedItem:feedItemRow:pageCellState:configuration:contentWidth:textWidth:combinedContextOptions:userSession:](MYFeedItemTextCell.m:403)

9+MyApp __cmp_gen_8c7c(MYMainAppViewController.m:174)

10+MyApp MakeTextCacheWarmup(MakeTextCacheWarmup.m:47)

11+MyApp __81-[MYMainFeedViewController feedNetworkSource:didFinishLoadingObjects:withConfig:]_block_invoke.818

I figured out the issue with @bbum's help. The problem was with creating an instance of UIView on a non-main thread. This results in a race condition which ultimately crashes the app.