SpriteKit SKEmitterNode TARGETNODE incidente EXC_BAD_ACCESS

Question

Il contesto

Un SKEmitterNode è stato creato da un file sks, e ha aggiunto come un bambino di qualche sprite. targetNode dell'emettitore è impostato su un altro nodo nella scena.

func launch() { 

    let emitterPath = NSBundle.mainBundle().pathForResource(
     "trailblaze", ofType: "sks" 
    )! 
    let emitter = NSKeyedUnarchiver.unarchiveObjectWithFile(emitterPath) as SKEmitterNode 
    emitter.targetNode = (sprite.scene as GameScene).canvas 
    sprite.addChild(emitter)   
} 

The Crash

L'arresto avviene solo su dispositivi a 64 bit, ed ecco un registro:

* thread #1: tid = 0xd3127, 0x000000018a6d1194 SpriteKit`std::__1::__tree_iterator<SKCSprite*, std::__1::__tree_node<SKCSprite*, void*>*, long> std::__1::__tree<SKCSprite*, std::__1::less<SKCSprite*>, std::__1::allocator<SKCSprite*> >::find<SKCSprite*>(SKCSprite* const&) + 16, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0xbaddae9f5299becd) 
    frame #0: 0x000000018a6d1194 SpriteKit`std::__1::__tree_iterator<SKCSprite*, std::__1::__tree_node<SKCSprite*, void*>*, long> std::__1::__tree<SKCSprite*, std::__1::less<SKCSprite*>, std::__1::allocator<SKCSprite*> >::find<SKCSprite*>(SKCSprite* const&) + 16 
    frame #1: 0x000000018a6d1150 SpriteKit`unsigned long std::__1::__tree<SKCSprite*, std::__1::less<SKCSprite*>, std::__1::allocator<SKCSprite*> >::__erase_unique<SKCSprite*>(SKCSprite* const&) + 20 
    frame #2: 0x000000018a6cc900 SpriteKit`SKCSprite::removeSubsprite(SKCSprite*) + 48 
    frame #3: 0x000000018a6d32e4 SpriteKit`SKCEmitterSprite::~SKCEmitterSprite() + 80 
    frame #4: 0x000000018a6d2ef4 SpriteKit`SKCEmitterSprite::~SKCEmitterSprite() + 12 
    frame #5: 0x000000018a6b2068 SpriteKit`-[SKNode dealloc] + 48 
    frame #6: 0x0000000185f55228 CoreFoundation`CFRelease + 524 
    frame #7: 0x0000000185f617e8 CoreFoundation`-[__NSArrayM dealloc] + 152 
    frame #8: 0x000000018a6b21f4 SpriteKit`-[SKNode .cxx_destruct] + 216 
    frame #9: 0x0000000196a8eb1c libobjc.A.dylib`object_cxxDestructFromClass(objc_object*, objc_class*) + 148 
    frame #10: 0x0000000196a9bf38 libobjc.A.dylib`objc_destructInstance + 92 
    frame #11: 0x0000000196a9bf90 libobjc.A.dylib`object_dispose + 28 
    frame #12: 0x000000018ab60d64 UIKit`-[UIResponder dealloc] + 116 
    frame #13: 0x000000018a6b208c SpriteKit`-[SKNode dealloc] + 84 
    frame #14: 0x0000000185f55228 CoreFoundation`CFRelease + 524 
    frame #15: 0x0000000185f617e8 CoreFoundation`-[__NSArrayM dealloc] + 152 
    frame #16: 0x000000018a6b21f4 SpriteKit`-[SKNode .cxx_destruct] + 216 
    frame #17: 0x0000000196a8eb1c libobjc.A.dylib`object_cxxDestructFromClass(objc_object*, objc_class*) + 148 
    frame #18: 0x0000000196a9bf38 libobjc.A.dylib`objc_destructInstance + 92 
    frame #19: 0x0000000196a9bf90 libobjc.A.dylib`object_dispose + 28 
    frame #20: 0x000000018ab60d64 UIKit`-[UIResponder dealloc] + 116 
    frame #21: 0x000000018a6b208c SpriteKit`-[SKNode dealloc] + 84 
    frame #22: 0x0000000185f55228 CoreFoundation`CFRelease + 524 
    frame #23: 0x0000000185f5d308 CoreFoundation`-[__NSArrayI dealloc] + 88 
    frame #24: 0x0000000196aa9724 libobjc.A.dylib`(anonymous namespace)::AutoreleasePoolPage::pop(void*) + 564 
    frame #25: 0x0000000185f58e44 CoreFoundation`_CFAutoreleasePoolPop + 28 
    frame #26: 0x000000018a81c844 UIKit`_wrapRunLoopWithAutoreleasePoolHandler + 76 
    frame #27: 0x000000018602ea50 CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 32 
    frame #28: 0x000000018602b9dc CoreFoundation`__CFRunLoopDoObservers + 360 
    frame #29: 0x000000018602bdbc CoreFoundation`__CFRunLoopRun + 836 
    frame #30: 0x0000000185f590a4 CoreFoundation`CFRunLoopRunSpecific + 396 
    frame #31: 0x000000018f0bf5a4 GraphicsServices`GSEventRunModal + 168 
    frame #32: 0x000000018a88e3c0 UIKit`UIApplicationMain + 1488 
    * frame #33: 0x0000000100060d58 game-leader`top_level_code + 76 at AppDelegate.swift:12 
    frame #34: 0x0000000100060d98 game-name`main + 48 at AppDelegate.swift:0 
    frame #35: 0x00000001970fea08 libdyld.dylib`start + 4 

Answer 1

L'incidente sembra essere sicuramente un bug provenienti da SpriteKit, come ho risolto con successo ripristinando il nodo di destinazione:

deinit { 
    println("Ball dealloced") 
    // bug on 64-bit devices 
    particleEmitter?.targetNode = nil 
} 

func launch() { 

    let emitterPath = NSBundle.mainBundle().pathForResource(
     "trailblaze", ofType: "sks" 
    )! 
    let emitter = NSKeyedUnarchiver.unarchiveObjectWithFile(emitterPath) as SKEmitterNode 
    emitter.targetNode = (sprite.scene as GameScene).canvas 
    sprite.addChild(emitter) 

    particleEmitter = emitter 
}