EXC_BAD_ACCESS tapping uisearchbar three times - ios

Question

I am trying to implement a search bar in a UICollectionView as a UICollectionViewReusableView
This way I am not using a UISearchController but I am changing the datasource of the collectionview
In my custom layout I am adding the searchbar this way:
override func prepareLayout() {
super.prepareLayout()
var searchBarAttributes = UICollectionViewLayoutAttributes(forSupplementaryViewOfKind: TeacherSearchbarIdentifier, withIndexPath: NSIndexPath(forItem: 0, inSection: 0))
searchBarAttributes.frame = CGRectMake(0, 0, collectionViewContentSize().width, 44)
searchBarAttributes.zIndex = 100
miscAttributes.append(searchBarAttributes)
}
override func layoutAttributesForElementsInRect(rect: CGRect) -> [AnyObject]? {
var attributes = [UICollectionViewLayoutAttributes]()
for (idx, attr) in enumerate(miscAttributes) {
if CGRectIntersection(rect, attr.frame) != CGRectNull {
attributes.append(attr)
}
}
return attributes
}
I am setting the delegate like this:
func collectionView(collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, atIndexPath indexPath: NSIndexPath) -> UICollectionReusableView {
var view = collectionView.dequeueReusableSupplementaryViewOfKind(kind, withReuseIdentifier: kind, forIndexPath: indexPath) as! UICollectionReusableView
if kind == TeacherSearchbarIdentifier {
controller.searchBar = (view as! TeacherSearchView).searchBar
return view
}
}
The variable controller is the UICollectionViewController which implements the UISearchBarDelegate Protocol
The delegate is set in didSet of the searchBar variable. These are my delegates:
override func scrollViewDidScroll(scrollView: UIScrollView) {
self.view.endEditing(true)
}
func searchBarShouldBeginEditing(searchBar: UISearchBar) -> Bool {
searchBar.setShowsCancelButton(true, animated: true)
return true
}
func searchBarShouldEndEditing(searchBar: UISearchBar) -> Bool {
searchBar.setShowsCancelButton(false, animated: true)
searchBar.resignFirstResponder()
return true
}
func searchBarCancelButtonClicked(searchBar: UISearchBar) {
searchBar.setShowsCancelButton(false, animated: true)
searchBar.resignFirstResponder()
}
Now my problem!
When I am tapping on the search bar, the keyboard appears. If I press the cancel button or scroll, it dissappears. Just as I want it to. This also works a second time.
BUT!
If I do this a third time, I get a EXC_BAD_ACCESS:
I tried turning on Enabling Zombie Objects, but no information was provided.
I also tried profiling for Zombie Objects, it just crashes without any noticeable information.
Please help me on how I can resolve this error, or give me further debugging instructions.
EDIT 1:
Here is the output from bt all in the lldb debugger:
* thread #1: tid = 0x228fc, 0x000000019502fbd0 libobjc.A.dylib`objc_msgSend + 16, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x1cda8beb8)
frame #0: 0x000000019502fbd0 libobjc.A.dylib`objc_msgSend + 16
frame #1: 0x000000018328b2f4 CoreFoundation`-[__NSDictionaryM objectForKey:] + 84
frame #2: 0x00000001884a21b8 UIKit`-[UICollectionView _visibleViewDictForElementCategory:elementKind:] + 96
frame #3: 0x0000000187ff6644 UIKit`-[UICollectionView _indexPathForView:ofType:] + 160
frame #4: 0x000000018849c3dc UIKit`-[UICollectionView _setIsAncestorOfFirstResponder:] + 792
frame #5: 0x0000000187ed9418 UIKit`+[UIView(Internal) _setIsResponderAncestorOfFirstResponder:startingAtFirstResponder:] + 164
frame #6: 0x0000000187ed925c UIKit`-[UIResponder(Static) _setFirstResponder:] + 56
frame #7: 0x0000000187ed925c UIKit`-[UIResponder(Static) _setFirstResponder:] + 56
frame #8: 0x0000000187ed925c UIKit`-[UIResponder(Static) _setFirstResponder:] + 56
frame #9: 0x0000000187ed925c UIKit`-[UIResponder(Static) _setFirstResponder:] + 56
frame #10: 0x0000000187ed925c UIKit`-[UIResponder(Static) _setFirstResponder:] + 56
frame #11: 0x0000000187ed925c UIKit`-[UIResponder(Static) _setFirstResponder:] + 56
frame #12: 0x0000000187ed925c UIKit`-[UIResponder(Static) _setFirstResponder:] + 56
frame #13: 0x0000000187ed925c UIKit`-[UIResponder(Static) _setFirstResponder:] + 56
frame #14: 0x0000000187ed925c UIKit`-[UIResponder(Static) _setFirstResponder:] + 56
frame #15: 0x0000000187ed925c UIKit`-[UIResponder(Static) _setFirstResponder:] + 56
frame #16: 0x0000000187ed925c UIKit`-[UIResponder(Static) _setFirstResponder:] + 56
frame #17: 0x0000000187f1b194 UIKit`-[UITextField _becomeFirstResponder] + 60
frame #18: 0x000000018800f300 UIKit`-[UISearchBarTextField _becomeFirstResponder] + 108
frame #19: 0x0000000187e9ad28 UIKit`-[UIResponder becomeFirstResponder] + 392
frame #20: 0x0000000187e9b0ac UIKit`-[UIView(Hierarchy) becomeFirstResponder] + 124
frame #21: 0x0000000187f19de4 UIKit`-[UITextField becomeFirstResponder] + 68
frame #22: 0x0000000187fc9fc4 UIKit`-[UITextInteractionAssistant(UITextInteractionAssistant_Internal) setFirstResponderIfNecessary] + 200
frame #23: 0x0000000187fc962c UIKit`-[UITextInteractionAssistant(UITextInteractionAssistant_Internal) oneFingerTap:] + 1736
frame #24: 0x0000000187faf070 UIKit`_UIGestureRecognizerSendActions + 276
frame #25: 0x0000000187e486b4 UIKit`-[UIGestureRecognizer _updateGestureWithEvent:buttonEvent:] + 580
frame #26: 0x00000001882b938c UIKit`___UIGestureRecognizerUpdate_block_invoke662 + 60
frame #27: 0x0000000187e0c418 UIKit`_UIGestureRecognizerRemoveObjectsFromArrayAndApplyBlocks + 292
frame #28: 0x0000000187e0a7c4 UIKit`_UIGestureRecognizerUpdate + 2504
frame #29: 0x0000000187e4682c UIKit`-[UIWindow _sendGesturesForEvent:] + 1044
frame #30: 0x0000000187e45ee4 UIKit`-[UIWindow sendEvent:] + 660
frame #31: 0x0000000187e19120 UIKit`-[UIApplication sendEvent:] + 264
frame #32: 0x00000001880ba2b8 UIKit`_UIApplicationHandleEventFromQueueEvent + 15424
frame #33: 0x0000000187e17634 UIKit`_UIApplicationHandleEventQueue + 1716
frame #34: 0x0000000183358240 CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 24
frame #35: 0x00000001833574e4 CoreFoundation`__CFRunLoopDoSources0 + 264
frame #36: 0x0000000183355594 CoreFoundation`__CFRunLoopRun + 712
frame #37: 0x00000001832812d4 CoreFoundation`CFRunLoopRunSpecific + 396
frame #38: 0x000000018ccdf6fc GraphicsServices`GSEventRunModal + 168
frame #39: 0x0000000187e7ef40 UIKit`UIApplicationMain + 1488
* frame #40: 0x00000001000f0798 My-Project`main + 164 at AppDelegate.swift:14
frame #41: 0x00000001956c6a08 libdyld.dylib`start + 4
thread #2: tid = 0x22939, 0x00000001957c4c24 libsystem_kernel.dylib`kevent64 + 8, queue = 'com.apple.libdispatch-manager'
frame #0: 0x00000001957c4c24 libsystem_kernel.dylib`kevent64 + 8
frame #1: 0x000000010083a588 libdispatch.dylib`_dispatch_mgr_invoke + 276
frame #2: 0x000000010082b09c libdispatch.dylib`_dispatch_mgr_thread + 52
thread #8: tid = 0x229d9, 0x00000001957dfc78 libsystem_kernel.dylib`__workq_kernreturn + 8
frame #0: 0x00000001957dfc78 libsystem_kernel.dylib`__workq_kernreturn + 8
frame #1: 0x00000001958792dc libsystem_pthread.dylib`_pthread_wqthread + 992
thread #7: tid = 0x229da, 0x00000001957dfc78 libsystem_kernel.dylib`__workq_kernreturn + 8
frame #0: 0x00000001957dfc78 libsystem_kernel.dylib`__workq_kernreturn + 8
frame #1: 0x00000001958792dc libsystem_pthread.dylib`_pthread_wqthread + 992
thread #9: tid = 0x229df, 0x00000001957dfc78 libsystem_kernel.dylib`__workq_kernreturn + 8
frame #0: 0x00000001957dfc78 libsystem_kernel.dylib`__workq_kernreturn + 8
frame #1: 0x00000001958792dc libsystem_pthread.dylib`_pthread_wqthread + 992
thread #10: tid = 0x229e1, 0x00000001957dfc78 libsystem_kernel.dylib`__workq_kernreturn + 8
frame #0: 0x00000001957dfc78 libsystem_kernel.dylib`__workq_kernreturn + 8
frame #1: 0x00000001958792dc libsystem_pthread.dylib`_pthread_wqthread + 992
thread #11: tid = 0x229e2, 0x00000001957dfc78 libsystem_kernel.dylib`__workq_kernreturn + 8
frame #0: 0x00000001957dfc78 libsystem_kernel.dylib`__workq_kernreturn + 8
frame #1: 0x00000001958792dc libsystem_pthread.dylib`_pthread_wqthread + 992
thread #12: tid = 0x229e3, 0x00000001957c4e0c libsystem_kernel.dylib`mach_msg_trap + 8, name = 'com.apple.NSURLConnectionLoader'
frame #0: 0x00000001957c4e0c libsystem_kernel.dylib`mach_msg_trap + 8
frame #1: 0x00000001957c4c88 libsystem_kernel.dylib`mach_msg + 72
frame #2: 0x0000000183357724 CoreFoundation`__CFRunLoopServiceMachPort + 200
frame #3: 0x0000000183355678 CoreFoundation`__CFRunLoopRun + 940
frame #4: 0x00000001832812d4 CoreFoundation`CFRunLoopRunSpecific + 396
frame #5: 0x0000000182d5e594 CFNetwork`+[NSURLConnection(Loader) _resourceLoadLoop:] + 440
frame #6: 0x00000001842a1db8 Foundation`__NSThread__main__ + 1072
frame #7: 0x000000019587bdc8 libsystem_pthread.dylib`_pthread_body + 164
frame #8: 0x000000019587bd24 libsystem_pthread.dylib`_pthread_start + 160
thread #13: tid = 0x229e6, 0x00000001957df498 libsystem_kernel.dylib`__select + 8, name = 'com.apple.CFSocket.private'
frame #0: 0x00000001957df498 libsystem_kernel.dylib`__select + 8
frame #1: 0x000000018335d128 CoreFoundation`__CFSocketManager + 672
frame #2: 0x000000019587bdc8 libsystem_pthread.dylib`_pthread_body + 164
frame #3: 0x000000019587bd24 libsystem_pthread.dylib`_pthread_start + 160
EDIT 2:
I created a standalone project which produces this error. Just run the project and tap/cancel the searchbar a few times.
Download Project
Video:
Bugreport: rdar://problem/21673802

Answer 1

I came up with a workaround for this in iOS 8. I discovered that the crash only occurred if the kind string of my supplementary view was a Swift string. There was no crash when I used an Objective-C string bridged to Swift. I tried the obvious idea of creating a NSString explicitly in Swift and even tried creating a CFString in Swift and bridging that. However, neither of those efforts were successful.
To easily verify this, try changing TeacherSearchbarIdentifier to an Objective-C string from UIKit like UICollectionElementKindSectionHeader.
A more rigorous workaround would involve creating Objective-C strings for your use case and exposing those to Swift. As an example:
// MyElementKinds.h
#import Foundation;
FOUNDATION_EXPORT NSString *const TeacherSearchbarIdentifier;
// MyElementKinds.m
#import "MyElementKinds.h"
NSString *const TeacherSearchbarIdentifier = #"TeacherSearchbarIdentifier";

Answer 2

I committed a bug report to apple, and they said this:
Apple Developer Relations
Thanks for the update. Upgrading is the solution then.
We are closing this bug report.
If you have questions regarding the resolution of this issue, please
update your bug report with that information.
Please be sure to regularly check new Apple releases for any updates
that might affect this issue.
Basically they don't care about this issue right now because of their upcoming release of iOS 9
I asked what the correct way is to keep compatibility to iOS 8 and the bug report is still open. Let's wait and see!