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＆＃34;我不相信我们之前遇到过＃34;。我如何让Swift等待＃34;欢迎＆＃34;先执行？

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

调用startScreen.run()而不是调用startScreen.run(_:completion)，并在完成处理程序内运行SKAction之后执行您想要执行的操作。请参阅documentation。

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

Answer 2

你可以使用一个等待你想要执行的计时器，如下所示：

 _ = Timer.scheduledTimer(withTimeInterval: 1.0, repeats: false) { _ in
   // do whatever you want after 1 second.
    }

你如何让Swift等待执行SKAction？

2 个答案: