xcode - swift 和 spritekit 中的倒计时

Question

我正在尝试对我的应用程序进行倒计时。我正在使用 SKLabelNode。这是我的代码:

class PlayScene: SKScene {
    var startCount = true
    var setTime = 0
    var myTime = 0
    var printTime = SKLabelNode(fontNamed: "arial")
    override func didMoveToView(view: SKView!) {
        self.backgroundColor = UIColor(hex: 0xD64541)
        self.printTime.text = NSString(format: "%i", self.myTime)
        self.addChild(self.printTime)
    }
    override func update(currentTime: NSTimeInterval) {
        if self.startCount == true {
            self.setTime = Int(currentTime)
            self.startCount = false
        }
        self.myTime = Int(currentTime) - self.setTime
        }
  }

我编译它没有问题，但它在执行时崩溃了......我认为这是我对字符串的转换......

谢谢

Answer 1

希望对您有所帮助。你几乎拥有它

class PlayScene: SKScene {

var startCount = true
var setTime = 0
var myTime = 0
var printTime = SKLabelNode(fontNamed: "arial")

override func didMoveToView(view: SKView) {
    self.backgroundColor = UIColor.orangeColor()

    //self.printTime.text = NSString(format: "%i", self.myTime)//you need the position
    self.printTime.position = CGPointMake(self.size.width * 0.5, self.size.height * 0.5)
    self.addChild(self.printTime)
}
override func update(currentTime: NSTimeInterval) {
    if self.startCount == true {
        self.setTime = Int(currentTime)
        self.startCount = false
    }
    self.myTime = Int(currentTime) - self.setTime
     self.printTime.text = ("format:\(self.myTime)")//put your label in update so it shows each second.
}