ios - 你如何让 Swift 等待 SKAction 被执行？

Question

我有以下 Swift 代码，但是，当我在 Xcode Simulator 中运行它时，它会直接跳到“我不相信我们以前见过面”。如何让 Swift 等待“Welcome”先被执行？

import SpriteKit
import GameplayKit

class GameScene: SKScene {

override func didMove(to view: SKView) {

    // Get label node from scene and store it for use later

    let animateList = SKAction.sequence([SKAction.fadeIn(withDuration: 1.0), SKAction.wait(forDuration: 2.0), SKAction.fadeOut(withDuration: 1.0)])

    let startScreen = SKLabelNode(fontNamed: "Helvetica Neue UltraLight")
    startScreen.text = "Welcome"
    startScreen.fontSize = 100.0
    startScreen.fontColor = SKColor.white
    startScreen.position = CGPoint(x: self.frame.midX, y: self.frame.midY)
    self.addChild(startScreen)
    startScreen.alpha = 0.0

    startScreen.run(animateList)

    startScreen.text = "I don't belive we have met before"

    startScreen.run(animateList)



    }


}

Answer 1

不要调用 startScreen.run()，而是调用 startScreen.run(_:completion) 并在 SKAction< 之后执行您想执行的操作s 已在完成处理程序中运行。查看documentation .

startScreen.run(animateList, completion: {
    self.startScreen.text = "I don't belive we have met before"
    self.startScreen.run(animateList)
})