使用生成函数动画图像

Question

我正在尝试将5帧的动画合并到我现有的spwn中的spawn函数中。目前，一只乌鸦从右向左移动屏幕，我想为此设置动画，但无论我尝试什么，我都会继续生成线程1错误。

通过注释掉某些代码，我可以在屏幕上静止位置动画鸟或者从右向左移动鸟但不动画（注释掉spawn func）。

我知道下面的代码不适用于它当前的形式，但它是我正在使用的所有内容，希望有人可以帮助我。

以下是我试图插在一起的所有代码......

谢谢，

//did move to view

var crowTexture1 = SKTexture(imageNamed: "crow1")
crowTexture1.filteringMode = SKTextureFilteringMode.Nearest
var crowTexture2 = SKTexture(imageNamed: "crow2")
crowTexture2.filteringMode = SKTextureFilteringMode.Nearest
var crowTexture3 = SKTexture(imageNamed: "crow3")
crowTexture3.filteringMode = SKTextureFilteringMode.Nearest
var crowTexture4 = SKTexture(imageNamed: "crow4")
crowTexture4.filteringMode = SKTextureFilteringMode.Nearest
var crowTexture5 = SKTexture(imageNamed: "crow5")
crowTexture5.filteringMode = SKTextureFilteringMode.Nearest


    var animFly = SKAction.animateWithTextures([crowTexture1, crowTexture2, crowTexture3, crowTexture4, crowTexture5], timePerFrame: 0.1)
    var fly = SKAction.repeatActionForever(animFly)

    var distanceToMoveBird = CGFloat(self.frame.size.width + 2 * crowTexture1.size().width);
    var moveBirds = SKAction.moveByX(-distanceToMoveBird, y:0, duration:NSTimeInterval(0.0040 * distanceToMoveBird));
    var removeBirds = SKAction.removeFromParent();
    moveAndRemoveBirds = SKAction.sequence([moveBirds, removeBirds,]);

    var spawnBirds = SKAction.runBlock({() in self.spawnBird()})
    var delayBirds = SKAction.waitForDuration(NSTimeInterval(4.0))
    var spawnThenDelayBirds = SKAction.sequence([spawnBirds, delayBirds])
    var spawnThenDelayForeverBirds = SKAction.repeatActionForever(spawnThenDelayBirds)
    self.runAction(spawnThenDelayForeverBirds)

//spawning function

func spawnBird() {


    var bird = SKSpriteNode()
    bird.position = CGPointMake( self.frame.size.width + crowTexture1.size().width * 2, 0 );
    var height = UInt32( self.frame.size.height / 1 )
    var height_max = UInt32( 500 )
    var height_min = UInt32( 500 ) //300
    var y = arc4random_uniform(height_max - height_min + 1) + height_min;
    var bird1 = SKSpriteNode(texture: crowTexture1)



    bird1.position = CGPointMake(0.0, CGFloat(y))
    bird1.physicsBody = SKPhysicsBody(rectangleOfSize: bird1.size)
    bird1.physicsBody?.dynamic = false
    bird1.physicsBody?.categoryBitMask = crowCategory
    bird1.physicsBody?.collisionBitMask = catCategory | scoreCategory
    bird1.physicsBody?.contactTestBitMask = 0
    bird.addChild(bird1)

    bird.runAction(moveAndRemoveBirds)

    birds.addChild(bird)

}