如何在swift中爲SKShapeNode創建動畫？

Question

我試圖給SKShapeNode設置動畫，讓它放入並水平來回移動。我如何用SKShapeNode做到這一點？我一直無法找到關於此的任何信息。

Answer 1

您可以使用SKAction moveBy。你可以創建一個動作向右移動和左移你只需要扭轉的第一個動作：

override func didMoveToView(view: SKView) { 
    /* Setup your scene here */ 

    let sprite = SKSpriteNode(imageNamed:"Spaceship") 
    sprite.xScale = 0.5 
    sprite.yScale = 0.5 
    sprite.position = CGPointMake(view.scene!.frame.midX - view.bounds.midX - sprite.frame.width, view.scene!.frame.midY) 

    let moveRightAction = SKAction.moveBy(CGVector(dx: view.bounds.midX + (3 * sprite.frame.width), dy: 0), duration: 2.0) 
    let moveLefttAction = moveRightAction.reversedAction() 
    let backAndForthSequence = SKAction.sequence([moveRightAction,moveLefttAction]) 

    sprite.runAction(SKAction.repeatActionForever(backAndForthSequence)) 

    self.addChild(sprite) 
}