I get the following crash in my iOS 9 app simply by adding a CALayer to the
current view controller's self.view.layer and then dismissing the current view
controller. Simplified code:
@property (strong,nonatomic) CALayer *layer;
. . .
_layer = [[CALayer alloc] init];
[_layer setDelegate: self];
[self.view.layer addSublayer:_layer];
Upon dismissing the VC:
[self dismissViewControllerAnimated:YES completion:nil];
The following exception occurs:
(lldb) bt
* thread #1: tid = 0x121bd, 0x22c2c68a libobjc.A.dylib`objc_retain + 10, queue
= 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1,
address=0xb0000010)
frame #0: 0x22c2c68a libobjc.A.dylib`objc_retain + 10
frame #1: 0x27a2a22a UIKit`-[UIView(Hierarchy) subviews] + 330
frame #2: 0x27b3e1ea UIKit`discardEngineRecursive + 118
frame #3: 0x27a2fd06 UIKit`-[UIView dealloc] + 630
frame #4: 0x2336cd98 CoreFoundation`-[__NSDictionaryM dealloc] + 132
frame #5: 0x22c2cf8a libobjc.A.dylib`objc_object::sidetable_release(bool) +
150
frame #6: 0x22c2d3cc libobjc.A.dylib`(anonymous
namespace)::AutoreleasePoolPage::pop(void*) + 388
frame #7: 0x23363f30 CoreFoundation`_CFAutoreleasePoolPop + 16
frame #8: 0x23415c56 CoreFoundation`__CFRunLoopRun + 1598
frame #9: 0x233641c8 CoreFoundation`CFRunLoopRunSpecific + 516
frame #10: 0x23363fbc CoreFoundation`CFRunLoopRunInMode + 108
frame #11: 0x24980af8 GraphicsServices`GSEventRunModal + 160
frame #12: 0x27a9c434 UIKit`UIApplicationMain + 144
* frame #13: 0x001b655e ProteinFold`main(argc=1, argv=0x0043bbc8) + 122 at
main.m:14
If I remove the CALayer first before the
-dismissViewControllerAnimated:completion:, it doesn't crash:
[layer removeFromSuperlayer];
Why do I need to explicitly remove my added CALayer before dismissing the VC?
Note: If I declare layer as weak, the crash does not occur, but neither does
the layer display onscreen.
-Carl
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