UICollectionView crash when inserting items quickly

Originator:adam
Number:rdar://12877037 Date Originated:13-Dec-2012 05:27 PM
Status:Duplicate/14332392 Resolved:
Product:iPhone SDK Product Version:6.0
Classification:Crash/Hang/Data Loss Reproducible:Always
 
WIth a UICollectionView using the stock UICollectionViewFlowLayout, calling insertItemsAtIndexPaths: too quickly can cause a crash.  Code that inserts a new item using insertItemsAtIndexPaths: into the UICollectionView every 0.05 seconds can cause a crash.

Steps to Reproduce:
1) Create a project. Set up a view controller with a UICollectionView and a UICollectionViewFlowLayout.
2) In viewDidAppear:, start inserting items into the collection view every 0.05 seconds. It is best to do this using dispatch_after.
1) Run the project on either the iOS 6.0 or 6.1 iPad simulator.
2) If the app doesn't crash within a few seconds, rerun the app.  About 60% of the time the app will crash with the error: 
*** Assertion failure in -[UICollectionViewData indexPathForItemAtGlobalIndex:], /SourceCache/UIKit_Sim/UIKit-2380.14/UICollectionViewData.m:442
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'request for index path for global index 1610612735 when there are only 1 items in the collection view'
*** First throw call stack:
(0x1c9b012 0x10cde7e 0x1c9ae78 0xb63f35 0x544ce0 0x52a0cb 0x523336 0x525b35 0x52308b 0x526aa5 0x526b69 0x2cb7 0x49fe53f 0x4a10014 0x4a007d5 0x1c41af5 0x1c40f44 0x1c40e1b 0x1bf57e3 0x1bf5668 0x1453c 0x242d 0x2355 0x1)
libc++abi.dylib: terminate called throwing an exception


Expected Results:
The app shouldn't crash when inserting items into the UICollectionView very quickly.

Actual Results:
The app crashes with the error in the Steps to Reproduce section.

Regression:
N/A

Comments

Still happens on iOS 7, but the exception has changed

Under iOS 7, the crash still happens however the error message has changed.

The error message is: 2013-06-12 14:50:59.962 BANANA[20656:c07] * Assertion failure in -[UICollectionViewCell addUpdateAnimation], /SourceCache/UIKitSim/UIKit-2776.18/UICollectionViewCell.m:146 2013-06-12 14:51:03.075 BANANA[20656:c07] * Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'too many update animations on one view - limit is 15 in flight at a time (<UICollectionViewCell: 0x8a47f70; frame = (0 0; 50 50); animations = { opacity=; }; layer = >)' * First throw call stack: (0x2230028 0x13fa902 0x222fea8 0xdccb05 0x603ce1 0x5f9fa9 0x849a4 0x84c00 0x5f9a1c 0x5f5bb8 0x5fad04 0x5fade8 0x5f2a 0x56c8c32 0x56dd5a9 0x56cbb48 0x2294dce 0x21d5f59 0x21d559f 0x21d53eb 0x218d404 0x218d22b 0x24b6b 0x532d 0x5969725) libc++abi.dylib: terminating with uncaught exception of type NSException (lldb)

By adam at Sept. 29, 2013, 2:22 p.m. (reply...)

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