ios - 多次调用函数时程序崩溃

我有一个将SKSpriteNode从一个点移动到另一个点的功能。一次调用它就可以正常工作。但是当我多次调用它时，整个程序崩溃了。

    func play()
    {
        self.moveNode()
        self.moveNode()
    }

    func moveNode()
    {
        let player = SKSpriteNode(imagenamed: "player.png")
        player.position = CGPointMake(500.0, 500.0)
        self.addChild(player)
        let fire = SKAction.moveTo(CGPointMake(100.0, 100.0), duration: 0.25)
        player.runAction(fire)
    }

这些是崩溃日志，（我不知道如何阅读它们，所以我发布了所有内容，我像5-6次一样运行了它）：

2015-06-15 20:55:49.616 The Game[2099:42388] * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Attemped to add a SKNode which already has a parent: name:'(null)' texture:[ 'player.png' (640 x 480)] position:{500, 500} size:{64, 48} rotation:0.00' * First throw call stack: (
0 CoreFoundation 0x0000000101bc6a75 exceptionPreprocess + 165
1 libobjc.A.dylib 0x00000001038d4bb7 objc_exception_throw + 45
2 CoreFoundation 0x0000000101bc69ad +[NSException raise:format:] + 205
3 SpriteKit 0x00000001024881a6 -[SKNode addChild:] + 111
4 The Game 0x00000001019d2156 _TFC13The_Game6Level111createNodefS0_FT_T_ + 678
5 The Game 0x00000001019d21fb _TFC13The_Game6Level110moveNodefS0_FT_T_ + 59
6 The Game 0x00000001019d0bc9 _TFC13The_Game6Level16updatefS0_FSdT_ + 73
7 The Game 0x00000001019d0c08 _TToFC13The_Game6Level16updatefS0_FSdT_ + 40
8 SpriteKit 0x000000010247bb68 -[SKView(Private) _update:] + 1106
9 SpriteKit 0x00000001024792d9 -[SKView renderCallback:shouldBlock:] + 837
10 SpriteKit 0x0000000102476391 __29-[SKView setUpRenderCallback]_block_invoke + 56
11 SpriteKit 0x00000001024a2df4 -[SKDisplayLink _callbackForNextFrame:] + 256
12 QuartzCore 0x000000010652a5c7 _ZN2CA7Display15DisplayLinkItem8dispatchEv + 37
13 QuartzCore 0x000000010652a48f _ZN2CA7Display11DisplayLink14dispatch_itemsEyyy + 315
14 CoreFoundation 0x0000000101b2e6c4 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION + 20
15 CoreFoundation 0x0000000101b2e285 __CFRunLoopDoTimer + 1045
16 CoreFoundation 0x0000000101af159d __CFRunLoopRun + 1901
17 CoreFoundation 0x0000000101af0bc6 CFRunLoopRunSpecific + 470
18 GraphicsServices 0x0000000108fc6a58 GSEventRunModal + 161
19 UIKit 0x000000010260f580 UIApplicationMain + 1282
20 The Game 0x00000001019d872e top_level_code + 78
21 The Game 0x00000001019d876a main + 42
22 libdyld.dylib 0x00000001040c2145 start + 1 ) libc++abi.dylib: terminating with uncaught exception of type NSException (lldb)

最佳答案

通过这种方式使用动画来使用动画确实是一个坏主意。这是一种使用顺序和重复动作包装基本命令来完成相同操作的方法：

let move = SKAction.moveTo(CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame)), duration: 0)
let fire = SKAction.moveTo(CGPointMake(100.0, 100.0), duration: 0.25)
let wait = SKAction.waitForDuration(0.5)

let sequence = SKAction.sequence([move, fire, wait])
let repeated = SKAction.repeatAction(sequence, count:2)

player.runAction(repeated)

关于ios - 多次调用函数时程序崩溃，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/30858484/