Question

我只想在'didSimulatePhysics（）'中编码，让鲨鱼在到达屏幕末尾时向相反的方向前进。但是当我尝试在'didSimulatePhysics（）'中使用它时，我无法让Swift找到鲨鱼

GameElementsClass：

import SpriteKit

 extension GameScene {

    func createSharkAtPosition (position:CGPoint, ofType type:SharkType) -> SharkNode {

        let node = SharkNode()
        let position = CGPoint(x: position.x * scaleFactor, y: position.y)
        node.position = position
        node.name = "SHARKNODE"
        node.sharkType = type
        var sprite:SKSpriteNode


        sprite = SKSpriteNode(imageNamed: "shark1")

        node.addChild(sprite)

        node.physicsBody = SKPhysicsBody(rectangleOfSize: sprite.size)
        node.physicsBody?.dynamic = true
        node.physicsBody?.affectedByGravity = false
        node.physicsBody?.velocity.dx = CGFloat(-60)

        node.physicsBody?.categoryBitMask = CollisionBitMask.Shark
        node.physicsBody?.collisionBitMask = 0


        return node
    }
}

GameSceneClass：

func sharkMaker() {
    let randomXPos = arc4random_uniform(170) + 10
    let yPosition = CGRectGetMidY(self.frame) + 200 * CGFloat(counter)
    counter += 1
    let shark = createSharkAtPosition(CGPoint(x: CGFloat(randomXPos), y:    yPosition - 180), ofType: SharkType.normalShark)
    foreground.addChild(shark)

}


 override func didSimulatePhysics() {

    if node.position.x < -10 {
        node.xScale =  -1
        node.physicsBody?.velocity.dx = CGFloat(50)
    }else if (node.position.x > self.size.width + 10) {
        node.xScale = 1
        node.physicsBody?.velocity.dx = CGFloat(-50)
    }

Answer 1

shark变量是sharkMaker的本地变量，我想你的代码不能编译，或者？要么使用属性来存储鲨鱼，要么将它命名为shark.name="Sharky" and then use让shark = childNodeByName（＆＃34; Sharky＆＃34;）`在层次结构的某处找到它。

请参阅另一个类中的对象

1 个答案: