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[SR-8745] indexPathForItem(at point: CGPoint) terminating due to internal misuse of -[__NSArrayM insertObject:atIndex:] #51254

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swift-ci opened this issue Sep 14, 2018 · 2 comments
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[SR-8745] indexPathForItem(at point: CGPoint) terminating due to internal misuse of -[__NSArrayM insertObject:atIndex:] #51254

swift-ci opened this issue Sep 14, 2018 · 2 comments
Labels
bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. standard library Area: Standard library umbrella

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@swift-ci
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Previous ID SR-8745
Radar None
Original Reporter twof (JIRA User)
Type Bug
Status Resolved
Resolution Invalid
Environment

Stable XCode and Swift

Additional Detail from JIRA
Votes 0
Component/s Standard Library
Labels Bug
Assignee None
Priority Medium

md5: 2a81948ba8c55df88834cbeae92e0e60

Issue Description:

I'm not sure if this is the correct place to be reporting bugs with UIKit, but let me know if I should move it elsewhere.

This bug triggers 100% of the time with my codebase in its current state, but it was working fine previously. I'm not going to be able to share the full project because it's proprietary, and I doubt I'll be able to create a simple repro, but I'm using this library:
https://github.com/mmick66/KDDragAndDropCollectionView

and the problem line is 62 of KDDragAndDropCollectionView.swift

In case you don't want to go looking through it:

// MARK : KDDraggable
public func canDragAtPoint(_ point : CGPoint) -> Bool {
    if let dataSource = self.dataSource as? KDDragAndDropCollectionViewDataSource,
    let indexPathOfPoint = self.indexPathForItem(at: point) { // Errors out on this one
        return dataSource.collectionView(self, cellIsDraggableAtIndexPath: indexPathOfPoint)
    }

    return false
}

But even if you execute

self.indexPathForItem(at: point)

on its own within that method you hit the same error.

The issue is also not the point. For example, if I hard code (0, 0) and pass that instead, I get the same error.

Console output:

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSArrayM insertObject:atIndex:]: object cannot be nil'
*** First throw call stack:
(
    0   CoreFoundation                      0x00000001146a21e6 __exceptionPreprocess + 294
    1   libobjc.A.dylib                     0x0000000113188031 objc_exception_throw + 48
    2   CoreFoundation                      0x00000001146e20bc _CFThrowFormattedException + 194
    3   CoreFoundation                      0x00000001145d12a9 -[__NSArrayM insertObject:atIndex:] + 1273
    4   UIKit                               0x000000011113f7c9 -[UICollectionViewFlowLayout layoutAttributesForElementsInRect:] + 473
    5   UIKit                               0x0000000111169b3b __45-[UICollectionViewData validateLayoutInRect:]_block_invoke + 237
    6   UIKit                               0x0000000111168e60 -[UICollectionViewData validateLayoutInRect:] + 1343
    7   UIKit                               0x000000011116be80 -[UICollectionViewData layoutAttributesForElementsInRect:] + 348
    8   UIKit                               0x0000000111104b80 -[UICollectionView _indexPathForItemAtPoint:] + 213
    9   UIKit                               0x0000000111104a32 -[UICollectionView indexPathForItemAtPoint:] + 23
    10  KDDragAndDropCollectionViews        0x000000010e5858fc _T028KDDragAndDropCollectionViews0abcD4ViewC14canDragAtPointSbSC7CGPointVF + 140
    11  KDDragAndDropCollectionViews        0x000000010e58d2e5 _T028KDDragAndDropCollectionViews0abcD4ViewCAA11KDDraggableA2aDP14canDragAtPointSbSC7CGPointVFTW + 37
    12  KDDragAndDropCollectionViews        0x000000010e58fb3e _T028KDDragAndDropCollectionViews0abC7ManagerC17gestureRecognizerSbSo09UIGestureH0C_So7UITouchC13shouldReceivetF + 878
    13  KDDragAndDropCollectionViews        0x000000010e590871 _T028KDDragAndDropCollectionViews0abC7ManagerC17gestureRecognizerSbSo09UIGestureH0C_So7UITouchC13shouldReceivetFTo + 81
    14  UIKit                               0x0000000110c2f899 -[UIGestureRecognizer _delegateShouldReceiveTouch:] + 129
    15  UIKit                               0x0000000110c2f793 -[UIGestureRecognizer _shouldReceiveTouch:recognizerView:touchView:] + 716
    16  UIKit                               0x0000000111226e69 __56-[UITouchesEvent _addGestureRecognizersForView:toTouch:]_block_invoke + 333
    17  UIKit                               0x0000000111226a2a _UIEventEnumerateGesturesForView + 467
    18  UIKit                               0x0000000111226cec -[UITouchesEvent _addGestureRecognizersForView:toTouch:] + 131
    19  UIKit                               0x000000011122747c -[UITouchesEvent _addTouch:forDelayedDelivery:] + 1333
    20  UIKit                               0x0000000110f8ad64 _AddTouchToEventAndDetermineIfNeedsCancel + 197
    21  UIKit                               0x0000000110f8ade2 ____updateTouchesWithDigitizerEventAndDetermineIfShouldSend_block_invoke.107 + 61
    22  CoreFoundation                      0x0000000114761c5f ____NSDictionaryEnumerate_block_invoke.13 + 31
    23  CoreFoundation                      0x00000001145e7450 CFBasicHashApply + 128
    24  CoreFoundation                      0x000000011462621f __NSDictionaryEnumerate + 207
    25  UIKit                               0x0000000110f8735d __updateTouchesWithDigitizerEventAndDetermineIfShouldSend + 1455
    26  UIKit                               0x0000000110f8bf75 __dispatchPreprocessedEventFromEventQueue + 946
    27  UIKit                               0x0000000110f8f2c4 __handleEventQueueInternal + 5949
    28  CoreFoundation                      0x0000000114644bb1 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
    29  CoreFoundation                      0x00000001146294af __CFRunLoopDoSources0 + 271
    30  CoreFoundation                      0x0000000114628a6f __CFRunLoopRun + 1263
    31  CoreFoundation                      0x000000011462830b CFRunLoopRunSpecific + 635
    32  GraphicsServices                    0x00000001176b5a73 GSEventRunModal + 62
    33  UIKit                               0x0000000110630057 UIApplicationMain + 159
    34  Redbooth                            0x00000001095298f7 main + 55
    35  libdyld.dylib                       0x0000000115c7a955 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException

Googled around and couldn't find anyone with similar problems with {code:swift}indexPathForItem(at🙂
@belkadan
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Yeah, sorry, bugs with UIKit should still go to https://bugreport.apple.com, since they're not something we can fix in the Swift Open Source project.

@swift-ci
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Comment by Alex Reilly (JIRA)

Sorry about that. Thanks!

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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@belkadan @swift-ci