ios – 如何在SWIFT中使用SpriteKit脉冲精灵

我试图在SK / SWIFT中“脉冲”一个精灵.我尝试使用For循环和.setScale是粗略的,但它们没有工作(没有错误 – 只是没有动画).我觉得使用SKActions可能会更优雅.

在使用下面的帮助后,这是我目前的实施.但是,它出现了编译错误;

Expected member name or constructor call after type name &
Consecutive statement on a line must be separated by a ;

这是我正在使用的代码：

SKAction *pulseUp = [SKAction.scaleTo(3.0, duration: 3.0)]
SKAction *pulseDown = [SKAction.scaleTo(1.0, duration: 3.0)]
SKAction *pulse = [SKAction.sequence(pulseUp, pulseDown)]
SKAction *repeat = [SKAction repeatActionForever:pulse]]
[self.playButton runAction: repeat]

任何帮助将不胜感激.

在带有Swift的xCode版本8.3.3中,

let pulseUp = SKAction.scale(to: 3.0, duration: 1.0)
    let pulseDown = SKAction.scale(to: 0.5, duration: 1.0)
    let pulse = SKAction.sequence([pulseUp, pulseDown])
    let repeatPulse = SKAction.repeatForever(pulse)
    self.playButton.run(repeatPulse)