如何在swift中每秒执行一次函数？ [英] How can I make a function execute every second in swift?

问题描述

我想在我正在制作的游戏中添加一个得分到我的场景顶部。分数将根据您的持续时间而定，并且每秒都会增加。感谢您的帮助！

I want to add a score to the top of my scene in the game I am working on. The score is going to based on how long you last, and will increase every second. Thanks for the help in advance!

import SpriteKit

class easyScene: SKScene {
let scrollBarEasyBottom = SKSpriteNode(imageNamed: "scrollBarEasyBottom")
let scrollBarEasyTop = SKSpriteNode(imageNamed: "scrollBarEasyTop")
let ball = SKSpriteNode(imageNamed: "ball")
var origSBEBpositionX = CGFloat(0)
var origSBETpositionX = CGFloat(0)
var maxSBEBX = CGFloat(0)
var SBEBSpeed = 5
var maxSBETX = CGFloat(0)
var SBETSpeed = 5
var score = 0
var timer: NSTimer?

var scoreText = SKLabelNode(fontNamed: "Kailasa")

 override func didMoveToView(view: SKView) {
    println("Easy Scene is the location")
    self.backgroundColor = UIColor.blackColor()
    self.scrollBarEasyBottom.position = CGPoint(x:0, y:270)
    self.addChild(self.scrollBarEasyBottom)
    self.scrollBarEasyBottom.yScale = 0.2
    self.origSBEBpositionX = self.scrollBarEasyBottom.position.x
    // end scrollBarEasyBottom
    self.scrollBarEasyTop.position = CGPoint(x:20, y:400)
    self.addChild(self.scrollBarEasyTop)
    self.scrollBarEasyTop.yScale = 0.2
    self.origSBETpositionX = self.scrollBarEasyTop.position.x
    // end scrollBarEasyTop
    self.ball.position = CGPoint(x:40, y:293)
    self.addChild(self.ball)
    self.ball.yScale = 0.17
    self.ball.xScale = 0.17
    // end ball
    self.maxSBEBX = self.scrollBarEasyBottom.size.width - self.frame.size.width
    self.maxSBEBX *= -1
    self.maxSBETX = self.scrollBarEasyTop.size.width - self.frame.size.width
    self.maxSBETX *= -1
    //
    self.scoreText.text = "0"
    self.scoreText.fontSize = 60
    self.scoreText.position = CGPoint(x: CGRectGetMidX(self.frame), y: 500)
    self.scoreText.text = String(self.score)
    self.addChild(self.scoreText)
    timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("scoreIncrease") , userInfo: nil, repeats: true)
    func scoreIncrease (){
        score++
        println(score)
    }


}
override func update(currentTime: NSTimeInterval){
    if self.scrollBarEasyBottom.position.x <= maxSBEBX + 1200 {
        self.scrollBarEasyBottom.position.x = self.origSBEBpositionX
    }
    if self.scrollBarEasyTop.position.x <= maxSBETX + 1200 {
        self.scrollBarEasyTop.position.x = self.origSBETpositionX
    }

    scrollBarEasyBottom.position.x -= CGFloat(self.SBEBSpeed)
    scrollBarEasyTop.position.x -= CGFloat(self.SBETSpeed)
    // moving bars
    var degreeRotation = CDouble(self.SBEBSpeed) * M_PI / 180
    self.ball.zRotation -= CGFloat(degreeRotation)
    //rotate ball


    }


    }

运行此代码后，我总能得到无法识别的选择器发送到实例错误。

After running this code, I always get an "unrecognized selector sent to instance error".

推荐答案

你可以使用这样的一个：

You can use one like this:

var timer = NSTimer()

override func viewDidLoad() {
    scheduledTimerWithTimeInterval()
}

func scheduledTimerWithTimeInterval(){
    // Scheduling timer to Call the function "updateCounting" with the interval of 1 seconds
    timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("updateCounting"), userInfo: nil, repeats: true)
}

func updateCounting(){
    NSLog("counting..")
}

---

Swift 3：

var timer = Timer()

override func viewDidLoad() {               // Use for the app's interface
    scheduledTimerWithTimeInterval()
}

override func didMove(to view: SKView) {    // As part of a game
    scheduledTimerWithTimeInterval()
}

func scheduledTimerWithTimeInterval(){
    // Scheduling timer to Call the function "updateCounting" with the interval of 1 seconds
    timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(self.updateCounting), userInfo: nil, repeats: true)
}

@objc func updateCounting(){
    NSLog("counting..")
}

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