UIView をアニメーション化するコードがいくつかあります。パスに沿ってアニメーション化しながらズームダウンします。
以下のエラーでクラッシュします (再現可能: 常に):
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
それによって返された CAKeyframeAnimation を追加しないかのように、 以下のメソッド ( ) から来ていると思います。pathAnimationWithStartPoint:
[group setAnimations:@[ zoomAnimation ]];
それ以外の
[group setAnimations:@[ zoomAnimation, pathAnimation ]];
クラッシュすることなく実行されます。
- (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;
}
バックトレース:
* 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
NSZombie をオンにしても、これ以上有用なデバッグ情報は得られません。
Xcode 4.6.3 (4H1503) にアップグレードする前は、同じコードが機能していました。注意: シミュレーターでは、アニメーションが一時停止し、クリックすると再開することがありました。この奇妙なアーティファクトは、何かがおかしいという兆候でしたが、私はまだ知りませんでした.
私は何か見落としてますか?
これが既知のバグである場合、回避策はありますか?
いくつかの調査メモ:同様の質問が SOで尋ねられましたが、受け入れられた回答は、パス アニメーションを線形変換に変更することで問題を「修正」するだけです。
私の問題は、ここのブログ投稿にも非常に似ているようです: http://www.blogosfera.co.uk/2013/08/exc_bad_access-while-using-coreanimation/