UIScrollView internal consistency crash - ios

Question

I'm struggling with this intermittent crash issue on my UITableView which has UICollectionViews.
I have a navigation controller whose root view controller has:
UITableView with 3 sections
Each section has one row
Each row has a UICollectionView
The top row of UITableView (which is a collection view) is made to scroll automatically based on NSTimer.
The crash occurs when I push into the navigation controller and pop out back and forth. It happens when I do pushing and popping 3-4 times
The trace:
Thread 0 Crashed:
0 libobjc.A.dylib 0x38f74626 objc_msgSend + 6
1 UIKit 0x312a6740 -[UIScrollView(UIScrollViewInternal) _notifyDidScroll] + 60
2 UIKit 0x31020798 -[UIScrollView setContentOffset:] + 600
3 UIKit 0x312a76b6 -[UIScrollView(UIScrollViewInternal) _adjustContentOffsetIfNecessary] + 1394
4 UIKit 0x310d33d2 -[UIScrollView(UIScrollViewInternal) _stopScrollingNotify:pin:tramplingDragFlags:] + 414
5 UIKit 0x310d322a -[UIScrollView(UIScrollViewInternal) _stopScrollingNotify:pin:] + 26
6 UIKit 0x310d31e2 -[UIScrollView removeFromSuperview] + 26
7 UIKit 0x31001952 -[UIView dealloc] + 374
8 CoreFoundation 0x2e700140 CFRelease + 556
9 CoreFoundation 0x2e70b668 -[__NSArrayM dealloc] + 156
10 libobjc.A.dylib 0x38f79b66 objc_object::sidetable_release(bool) + 170
11 libobjc.A.dylib 0x38f7a0ce (anonymous namespace)::AutoreleasePoolPage::pop(void*) + 354
12 CoreFoundation 0x2e70347c _CFAutoreleasePoolPop + 12
13 CoreFoundation 0x2e798f0e __CFRunLoopRun + 1310
14 CoreFoundation 0x2e703724 CFRunLoopRunSpecific + 520
15 CoreFoundation 0x2e703506 CFRunLoopRunInMode + 102
16 GraphicsServices 0x336726ce GSEventRunModal + 134
17 UIKit 0x3106486c UIApplicationMain + 1132
18 BoatSenzeDev 0x00110648 main (main.m:16)
19 libdyld.dylib 0x39468ab4 start + 0

Answer 1

I think there's a bug somewhere on iOS 8 regarding the timing of UITableViewController (or plain UIViewController containing a UITableView) dealloc when dealing with transition animations. Somehow the view controller is already deallocated, but the table view is still trying to send messages to its delegate.
As a workaround, you can implement the dealloc method on the UITableViewController like this:
- (void)dealloc
{
self.tableView.delegate = nil;
self.tableView.dataSource = nil;
}