hi,
I got an crash in my App(only iOS11 and below), accidental appearance. Has no clue why this comes from, and how to avoid?
In my viewcontroller BBANovelWiseToNAReaderVC , implemention of UIScrollViewDelegate
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
.....
[self.collectionView layoutAttributesForItemAtIndexPath:bottomIndexPath]; // here crash!
....
}
Crash stacks:
Thread 0 Crashed: Queue: com.apple.main-thread 0
UIKit -[UICollectionViewData layoutAttributesForItemAtIndexPath:] (in UIKit) + 244 1
UIKit -[UICollectionView layoutAttributesForItemAtIndexPath:] (in UIKit) + 60 2
BaiduBoxApp -[BBANovelWiseToNAReaderVC scrollViewDidScroll:] (in BaiduBoxApp) (BBANovelWiseToNAReaderVC.m:0) 3
UIKit -[UIScrollView(UIScrollViewInternal) _notifyDidScroll] (in UIKit) + 76 4
UIKit -[UIScrollView setContentOffset:] (in UIKit) + 460 5
UIKit -[UIScrollViewScrollAnimation setProgress:] (in UIKit) + 308 6
UIKit -[UIAnimator(Static) _advanceAnimationsOfType:withTimestamp:] (in UIKit) + 280 7
QuartzCore CA::Display::DisplayLinkItem::dispatch() (in QuartzCore) + 40 8
QuartzCore CA::Display::DisplayLink::dispatch_items(unsigned long long, unsigned long long, unsigned long long) (in QuartzCore) + 424 9 IOKit IODispatchCalloutFromCFMessage (in IOKit) + 372 10
CoreFoundation __CFMachPortPerform (in CoreFoundation) + 180 11
CoreFoundation _CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ (in CoreFoundation) + 56 12 CoreFoundation __CFRunLoopDoSource1 (in CoreFoundation) + 436 13
CoreFoundation __CFRunLoopRun (in CoreFoundation) + 1800 14
CoreFoundation CFRunLoopRunSpecific (in CoreFoundation) + 384 15
GraphicsServices GSEventRunModal (in GraphicsServices) + 180 16
UIKit UIApplicationMain (in UIKit) + 204 17
BaiduBoxApp main (in BaiduBoxApp) (main.m:24) 18 ??? 0x00000001816f28b8 0x0 + 0