AutoCoding causes crash when using Core Animation

[turovyv]

Hi

In the app I'm developing I use Core Animation to animate a view's layer position like this:

CAKeyframeAnimation *pathAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
pathAnimation.fillMode = kCAFillModeForwards;
pathAnimation.removedOnCompletion = NO;
pathAnimation.repeatCount = 0;
pathAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
pathAnimation.duration = duration;

UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:CGPointMake(self.bounds.size.width / 2, self.bounds.size.height)
                                                     radius:kArcRadius
                                                 startAngle:DEGREES_TO_RADIANS(-165)
                                                   endAngle:DEGREES_TO_RADIANS(-15)
                                                  clockwise:YES];
pathAnimation.path = CGPathCreateCopy(path.CGPath);

[self.timerLabel.layer addAnimation:pathAnimation forKey:kArcAnimationKey];

After adding AutoCoding, the app crashes with EXC_BAD_ACCESS. Here is the stack trace:

#0  0x2f193d2e in CG::Path::apply(void*, void (*)(void*, CGPathElementType, CGPoint const*)) const ()
#1  0x2f193d22 in CGPathApply ()
#2  0x31551e10 in CA::Render::Path::new_path(CGPath const*, bool) ()
#3  0x3153266a in -[CAKeyframeAnimation _setCARenderAnimation:layer:] ()
#4  0x31532566 in -[CAKeyframeAnimation _copyRenderAnimationForLayer:] ()
#5  0x31510b4a in CA::Layer::commit_animations(CA::Transaction*, double (*)(CA::Layer*, double, void*), void (*)(CA::Layer*, CA::Render::Animation*, void*), void (*)(CA::Layer*, void**, void*), void*) ()
#6  0x3150c33a in CA::Context::commit_layer(CA::Layer*, unsigned int, unsigned int, void*) ()
#7  0x3150931a in CA::Layer::commit_if_needed(CA::Transaction*, void (*)(CA::Layer*, unsigned int, unsigned int, void*), void*) ()
#8  0x315092b8 in CA::Layer::commit_if_needed(CA::Transaction*, void (*)(CA::Layer*, unsigned int, unsigned int, void*), void*) ()
#9  0x315092b8 in CA::Layer::commit_if_needed(CA::Transaction*, void (*)(CA::Layer*, unsigned int, unsigned int, void*), void*) ()
#10 0x315092b8 in CA::Layer::commit_if_needed(CA::Transaction*, void (*)(CA::Layer*, unsigned int, unsigned int, void*), void*) ()
#11 0x315092b8 in CA::Layer::commit_if_needed(CA::Transaction*, void (*)(CA::Layer*, unsigned int, unsigned int, void*), void*) ()
#12 0x315092b8 in CA::Layer::commit_if_needed(CA::Transaction*, void (*)(CA::Layer*, unsigned int, unsigned int, void*), void*) ()
#13 0x315092b8 in CA::Layer::commit_if_needed(CA::Transaction*, void (*)(CA::Layer*, unsigned int, unsigned int, void*), void*) ()
#14 0x315092b8 in CA::Layer::commit_if_needed(CA::Transaction*, void (*)(CA::Layer*, unsigned int, unsigned int, void*), void*) ()
#15 0x315092b8 in CA::Layer::commit_if_needed(CA::Transaction*, void (*)(CA::Layer*, unsigned int, unsigned int, void*), void*) ()
#16 0x315092b8 in CA::Layer::commit_if_needed(CA::Transaction*, void (*)(CA::Layer*, unsigned int, unsigned int, void*), void*) ()
#17 0x31507634 in CA::Context::commit_transaction(CA::Transaction*) ()
#18 0x3150710e in CA::Transaction::commit() ()
#19 0x31500e3c in CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*) ()
#20 0x2f0dd1d4 in __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ ()
#21 0x2f0dab78 in __CFRunLoopDoObservers ()
#22 0x2f0daeba in __CFRunLoopRun ()
#23 0x2f045ce6 in CFRunLoopRunSpecific ()
#24 0x2f045aca in CFRunLoopRunInMode ()
#25 0x33d13282 in GSEventRunModal ()
#26 0x318e7a40 in UIApplicationMain ()

I guess methods defined in the category on NSObject somehow interfere with internal logic of CA classes.

[nicklockwood]

Hmm, I'm guessing that this is something to do with the NSCopying logic. I had issues with this and CoreData previously.

[juanchoc21]

I'm experiencing exactly the same issue (took me a while to figure it out).

[nicklockwood]

I've removed built-in NSCopying support. It's easy to add yourself if needed.