SpriteKit-创建一个计时器

Question

SpriteKit-创建一个计时器如何创建一个计时器，它每隔两秒钟就会在我的屏幕上的HUD上增加一个分数？这是我对HUD的代码：    @implementation MyScene{     int counter;     BOOL updateLabel;     SKLabelNode *counterLabel;}-(id)initWithSize:(CGSize)size{     if (self = [super initWithSize:size])     {         counter = 0;         updateLabel = false;         counterLabel = [SKLabelNode labelNodeWithFontNamed:@"Chalkduster"];         counterLabel.name = @"myCounterLabel";         counterLabel.text = @"0";         counterLabel.fontSize = 20;         counterLabel.fontColor = [SKColor yellowColor];         counterLabel.horizontalAlignmentMode = SKLabelHorizontalAlignmentModeCenter;         counterLabel.verticalAlignmentMode = SKLabelVerticalAlignmentModeBottom;         counterLabel.position = CGPointMake(50,50); // change x,y to location you want         counterLabel.zPosition = 900;         [self addChild: counterLabel];     }}

Answer 1

在SWIFT中可用：

var timescore = Int()  var actionwait = SKAction.waitForDuration(0.5)
            var timesecond = Int()
            var actionrun = SKAction.runBlock({
                    timescore++
                    timesecond++
                    if timesecond == 60 {timesecond = 0}
                    scoreLabel.text = "Score Time: \(timescore/60):\(timesecond)"
                })
            scoreLabel.runAction(SKAction.repeatActionForever(SKAction.sequence([actionwait,actionrun])))

Answer 2

我已经做了上面的快速例子，并为时钟增加了前导零点。

    func updateClock() {
    var leadingZero = ""
    var leadingZeroMin = ""
    var timeMin = Int()
    var actionwait = SKAction.waitForDuration(1.0)
    var timesecond = Int()
    var actionrun = SKAction.runBlock({
        timeMin++
        timesecond++
        if timesecond == 60 {timesecond = 0}
        if timeMin  / 60 <= 9 { leadingZeroMin = "0" } else { leadingZeroMin = "" }
        if timesecond <= 9 { leadingZero = "0" } else { leadingZero = "" }

        self.flyTimeText.text = "Flight Time [ \(leadingZeroMin)\(timeMin/60) : \(leadingZero)\(timesecond) ]"
    })
    self.flyTimeText.runAction(SKAction.repeatActionForever(SKAction.sequence([actionwait,actionrun])))}