如何在 swift 中执行一个函数 5 秒

Question

我正在创建一个游戏，此功能用作缩小精灵的电源。我希望这个函数执行 5 秒，并将这个 5 秒计时器附加到标签上作为倒计时。函数结束后，return精灵恢复到原来的大小。

函数只是通过设置比例来缩小节点。

func shrinkShip() { spaceShip.scale(to: CGSize(width: 60, height: 40)) }

Answer 1

您可以像这样为视图设置动画：

UIView.animate(withDuration: 5, animations: {
        self.spaceShip.scale(to: CGSize(width: 60, height: 40))
},
completion: { _ in
    UIView.animate(withDuration: 2) {
        self.spaceShip.transform = .identity // Reset your view
    }
})

Answer 2

你可以试试这样的

UIView.animate(withDuration: 5, animations: {
        self.spaceShip.transform = CGAffineTransform(scaleX: 60, y: 40)
},
completion: { _ in
    UIView.animate(withDuration: 2) {
        self.spaceShip.transform = .identity // Reset your view
    }
})

Answer 3

坚持使用 SpriteKit 我会做以下事情

func shrinkShip(duration: Double) { 

    let originalSize = spaceShip.size

    spaceShip.scale(to: CGSize(width: 60, height: 40)) 

    for x in 0..<Int(duration) {

        //increment the timer every 1 second for the duration
        self.run(SKAction.wait(forDuration: 1 * Double(x))) {
            self.timerLabel.text = String(Int(duration) - x)
        }
    }
    self.run(SKAction.wait(forDuration: duration)) {
        //return the spaceship to full size
        self.spaceShip.scale(to: originalSize) 
        //hide the timer
        self.timerLabel.text = ""
        self.timerLabel.isHidden = true
    }
}

如何在 swift 中执行一个函数 5 秒

How to execute a function for 5 seconds in swift

swift

algorithm

sprite-kit

skspritenode