我有一些代码来动画UIView：在沿着路径制作动画时将其缩小.
它崩溃了下面的错误(可重现：总是)：
CoreGraphics`CG::Path::apply(void*, void (*)(void*, CGPathElementType, CGPoint const*)) const:
0x1055c06: pushl %ebp
0x1055c07: movl %esp, %ebp
0x1055c09: subl $24, %esp
0x1055c0c: movl 8(%ebp), %eax
0x1055c0f: movl (%eax), %ecx
0x1055c11: movl (%ecx), %eax
0x1055c13: movl 16(%ebp), %edx
0x1055c16: movl %edx, 8(%esp)
0x1055c1a: movl 12(%ebp), %edx
0x1055c1d: movl %edx, 4(%esp)
0x1055c21: movl %ecx, (%esp)
0x1055c24: calll *64(%eax)
0x1055c27: addl $24, %esp
0x1055c2a: popl %ebp
0x1055c2b: ret
我认为它来自下面的方法(pathAnimationWithStartPoint :),好像我没有添加它返回的CAKeyframeAnimation,即只是：
[group setAnimations:@[ zoomAnimation ]];
代替
[group setAnimations:@[ zoomAnimation, pathAnimation ]];
它运行没有崩溃.
- (CAKeyframeAnimation *) pathAnimationWithStartPoint:(CGPoint) startPoint {
CGPoint endPoint = self.showApplicationTourButton.center;
CGFloat xDistanceBetweenStartAndEndPoints = abs(startPoint.x - endPoint.x);
CGFloat yOfHighestPointOfCurvePath = endPoint.y - 250;
CGPoint controlPoint1 = CGPointMake(startPoint.x + 1.0f / 3.0f * xDistanceBetweenStartAndEndPoints, yOfHighestPointOfCurvePath);
CGPoint controlPoint2 = CGPointMake(startPoint.x + 2.0f / 3.0f * xDistanceBetweenStartAndEndPoints, yOfHighestPointOfCurvePath);
CGMutablePathRef curvedPath = CGPathCreateMutable();
CGPathMoveToPoint(curvedPath, NULL, startPoint.x, startPoint.y);
CGPathAddCurveToPoint(curvedPath, NULL, controlPoint1.x, controlPoint1.y, controlPoint2.x, controlPoint2.y, endPoint.x, endPoint.y);
CAKeyframeAnimation *pathAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
pathAnimation.path = curvedPath;
CGPathRelease(curvedPath);
pathAnimation.calculationMode = kCAAnimationPaced;
pathAnimation.fillMode = kCAFillModeForwards;
pathAnimation.removedOnCompletion = NO;
return pathAnimation;
}
回溯：
* thread #1: tid = 0x1a03, 0x01055c11 CoreGraphics`CG::Path::apply(void*, void (*)(void*, CGPathElementType, CGPoint const*)) const + 11, stop reason = EXC_BAD_ACCESS (code=2, address=0x0)
frame #0: 0x01055c11 CoreGraphics`CG::Path::apply(void*, void (*)(void*, CGPathElementType, CGPoint const*)) const + 11
frame #1: 0x00f5d090 CoreGraphics`CGPathApply + 64
frame #2: 0x01838c68 QuartzCore`CA::Render::Path::new_path(CGPath const*, bool) + 158
frame #3: 0x018c3493 QuartzCore`-[CAKeyframeAnimation _setCARenderAnimation:layer:] + 176
frame #4: 0x018c3b2c QuartzCore`-[CAKeyframeAnimation _copyRenderAnimationForLayer:] + 68
frame #5: 0x018c6f12 QuartzCore`-[CAAnimationGroup _copyRenderAnimationForLayer:] + 241
frame #6: 0x018df547 QuartzCore`CA::Layer::commit_animations(CA::Transaction*, double (*)(CA::Layer*, double, void*), void (*)(CA::Layer*, CA::Render::Animation*, void*), void (*)(CA::Layer*, void**, void*), void*) + 641
frame #7: 0x01855520 QuartzCore`CA::Context::commit_layer(CA::Layer*, unsigned int, unsigned int, void*) + 94
frame #8: 0x018d87fa QuartzCore`CA::Layer::commit_if_needed(CA::Transaction*, void (*)(CA::Layer*, unsigned int, unsigned int, void*), void*) + 330
frame #9: 0x018d877e QuartzCore`CA::Layer::commit_if_needed(CA::Transaction*, void (*)(CA::Layer*, unsigned int, unsigned int, void*), void*) + 206
frame #10: 0x01856667 QuartzCore`CA::Context::commit_transaction(CA::Transaction*) + 1775
frame #11: 0x01857227 QuartzCore`CA::Transaction::commit() + 395
frame #12: 0x018f9b17 QuartzCore`+[CATransaction commit] + 52
frame #13: 0x000399bf MyApp`-[HomeViewController catchTourScrollViewScreenshotViewAndAnimateItToButton](self=0x0b4e5210, _cmd=0x006f381a) + 1903 at HomeViewController.m:197
frame #14: 0x0391f663 libobjc.A.dylib`-[NSObject performSelector:] + 62
frame #15: 0x0003c383 MyApp`-[NSObject(self=0x0b4e5210, _cmd=0x006ef5ad, selector=0x006f381a) performSelectorIfRespondsToIt:] + 243 at NSObject+PerformSelectorIfRespondsToIt.m:22
frame #16: 0x00042506 MyApp`__44-[TourViewController closeTourWithAnimation]_block_invoke268(.block_descriptor=0x0b6985a0, finished='\x01') + 86 at TourViewController.m:419
frame #17: 0x01af0df6 UIKit`-[UIViewAnimationBlockDelegate _didEndBlockAnimation:finished:context:] + 223
frame #18: 0x01ae3d66 UIKit`-[UIViewAnimationState sendDelegateAnimationDidStop:finished:] + 237
frame #19: 0x01ae3f04 UIKit`-[UIViewAnimationState animationDidStop:finished:] + 68
frame #20: 0x12b6ff28 UIKit`-[UIViewAnimationStateAccessibility(SafeCategory) animationDidStop:finished:] + 66
frame #21: 0x018df7d8 QuartzCore`CA::Layer::run_animation_callbacks(void*) + 284
frame #22: 0x03a90014 libdispatch.dylib`_dispatch_client_callout + 14
frame #23: 0x03a807d5 libdispatch.dylib`_dispatch_main_queue_callback_4CF + 296
frame #24: 0x03f3eaf5 CoreFoundation`__CFRunLoopRun + 1925
frame #25: 0x03f3df44 CoreFoundation`CFRunLoopRunSpecific + 276
frame #26: 0x03f3de1b CoreFoundation`CFRunLoopRunInMode + 123
frame #27: 0x044c67e3 GraphicsServices`GSEventRunModal + 88
frame #28: 0x044c6668 GraphicsServices`GSEventRun + 104
frame #29: 0x01aa5ffc UIKit`UIApplicationMain + 1211
frame #30: 0x0000285d MyApp`main(argc=1, argv=0xbffff3f4) + 141 at main.m:16
frame #31: 0x00002785 MyApp`start + 53
* thread #1: tid = 0x1a03, 0x01055c11 CoreGraphics`CG::Path::apply(void*, void (*)(void*, CGPathElementType, CGPoint const*)) const + 11, stop reason = EXC_BAD_ACCESS (code=2, address=0x0)
frame #0: 0x01055c11 CoreGraphics`CG::Path::apply(void*, void (*)(void*, CGPathElementType, CGPoint const*)) const + 11
frame #1: 0x00f5d090 CoreGraphics`CGPathApply + 64
frame #2: 0x01838c68 QuartzCore`CA::Render::Path::new_path(CGPath const*, bool) + 158
frame #3: 0x018c3493 QuartzCore`-[CAKeyframeAnimation _setCARenderAnimation:layer:] + 176
frame #4: 0x018c3b2c QuartzCore`-[CAKeyframeAnimation _copyRenderAnimationForLayer:] + 68
frame #5: 0x018c6f12 QuartzCore`-[CAAnimationGroup _copyRenderAnimationForLayer:] + 241
frame #6: 0x018df547 QuartzCore`CA::Layer::commit_animations(CA::Transaction*, double (*)(CA::Layer*, double, void*), void (*)(CA::Layer*, CA::Render::Animation*, void*), void (*)(CA::Layer*, void**, void*), void*) + 641
frame #7: 0x01855520 QuartzCore`CA::Context::commit_layer(CA::Layer*, unsigned int, unsigned int, void*) + 94
frame #8: 0x018d87fa QuartzCore`CA::Layer::commit_if_needed(CA::Transaction*, void (*)(CA::Layer*, unsigned int, unsigned int, void*), void*) + 330
frame #9: 0x018d877e QuartzCore`CA::Layer::commit_if_needed(CA::Transaction*, void (*)(CA::Layer*, unsigned int, unsigned int, void*), void*) + 206
frame #10: 0x01856667 QuartzCore`CA::Context::commit_transaction(CA::Transaction*) + 1775
frame #11: 0x01857227 QuartzCore`CA::Transaction::commit() + 395
frame #12: 0x018f9b17 QuartzCore`+[CATransaction commit] + 52
frame #13: 0x000399bf MyApp`-[HomeViewController catchTourScrollViewScreenshotViewAndAnimateItToButton](self=0x0b4e5210, _cmd=0x006f381a) + 1903 at HomeViewController.m:197
frame #14: 0x0391f663 libobjc.A.dylib`-[NSObject performSelector:] + 62
frame #15: 0x0003c383 MyApp`-[NSObject(self=0x0b4e5210, _cmd=0x006ef5ad, selector=0x006f381a) performSelectorIfRespondsToIt:] + 243 at NSObject+PerformSelectorIfRespondsToIt.m:22
frame #16: 0x00042506 MyApp`__44-[TourViewController closeTourWithAnimation]_block_invoke268(.block_descriptor=0x0b6985a0, finished='\x01') + 86 at TourViewController.m:419
frame #17: 0x01af0df6 UIKit`-[UIViewAnimationBlockDelegate _didEndBlockAnimation:finished:context:] + 223
frame #18: 0x01ae3d66 UIKit`-[UIViewAnimationState sendDelegateAnimationDidStop:finished:] + 237
frame #19: 0x01ae3f04 UIKit`-[UIViewAnimationState animationDidStop:finished:] + 68
frame #20: 0x12b6ff28 UIKit`-[UIViewAnimationStateAccessibility(SafeCategory) animationDidStop:finished:] + 66
frame #21: 0x018df7d8 QuartzCore`CA::Layer::run_animation_callbacks(void*) + 284
frame #22: 0x03a90014 libdispatch.dylib`_dispatch_client_callout + 14
frame #23: 0x03a807d5 libdispatch.dylib`_dispatch_main_queue_callback_4CF + 296
frame #24: 0x03f3eaf5 CoreFoundation`__CFRunLoopRun + 1925
frame #25: 0x03f3df44 CoreFoundation`CFRunLoopRunSpecific + 276
frame #26: 0x03f3de1b CoreFoundation`CFRunLoopRunInMode + 123
frame #27: 0x044c67e3 GraphicsServices`GSEventRunModal + 88
frame #28: 0x044c6668 GraphicsServices`GSEventRun + 104
frame #29: 0x01aa5ffc UIKit`UIApplicationMain + 1211
frame #30: 0x0000285d MyApp`main(argc=1, argv=0xbffff3f4) + 141 at main.m:16
frame #31: 0x00002785 MyApp`start + 53
打开NSZombie不会提供任何更有用的调试信息.
在升级到Xcode 4.6.3(4H1503)之前,使用相同的代码.需要注意的是：在模拟器中,动画有时会被暂停,点击它会恢复它.这个奇怪的神器是一个错误的迹象,但我还不知道.
我错过了什么？
如果这是一个已知的错误,是否有任何解决方法？
一些研究指出：
A similar question has been asked on SO,但接受的答案只是通过将路径动画更改为线性翻译来“修复”问题.
我的问题似乎也非常类似于这里的博客文章：http://www.blogosfera.co.uk/2013/08/exc_bad_access-while-using-coreanimation/
最佳答案 这真的不是什么答案,而是更多的尝试给你一个工具来找到更多的线索.希望有一个比我更有线索的人会参与其中.
>打开malloc堆栈日志记录.
>重现崩溃.
>检查寄存器;如果$r0或$r1看起来像堆分配,那么获取所述地址的malloc历史记录.
如果任何一个上的最后一个事件都是FREE,那么数据缓冲区(或对象)将被过早释放. (有关获取malloc历史的信息,请参阅http://lldb.llvm.org/lldb-gdb.html).
现在,即使确认这是一个过早的释放,这可能实际上对你没那么大帮助.它会告诉你,如果是这样,那就是竞争条件.不幸的是,修复它是不可能的,但可能是一种解决方法.如果你可以弄清楚你控制的对象可能已经分配了过早的free()d缓冲区,那么你应该能够保持对所述对象的强引用,直到动画完全完成.
并提出错误,请附上崩溃的二进制文件.
另外,打开malloc涂鸦.这将确保在释放后立即删除释放的内存,这应该尽快使崩溃发生.
