Question

美好的一天！我想用SKLabel制作一个计时器，以毫秒为单位计算时间。但我这样做的时间只有这样：

SKLabelNode *countDown = [SKLabelNode labelNodeWithFontNamed:@"Chalkduster"];
countDown.position = CGPointMake(10, -20);
countDown.horizontalAlignmentMode = SKLabelHorizontalAlignmentModeLeft;
countDown.fontSize = 20;
[bonus_10 addChild: countDown];
// Initialize the countdown variable
__block float countDownInt = i;
// Define the actions
SKAction *updateLabel = [SKAction runBlock:^{
    countDown.text = [NSString stringWithFormat:@"%f", countDownInt];
    countDownInt = countDownInt-0.1;
}];
// Create a combined action
SKAction *updateLabelAndWait = [SKAction sequence:@[updateLabel, wait]];
// Run action "seconds" number of times and then set the label to indicate
// the countdown has ended
[self runAction:[SKAction repeatAction] completion:^{
    countDown.text = @"Time's Up";
}];

有没有机会在几毫秒内做定时器？谢谢！

Answer 1

如果您可以跳过几毫秒的显示，我会使用更新方法。

这样的事情：

equal_range

Answer 2

如果您将秒数放在此处作为小数（如来自更新），则会将其格式化为

分：秒：十分之一秒

func timeString(seconds : CGFloat) -> String {

    // 90 seconds = 1.5
    let minutesFloat = seconds / 60

    // 1.5 = 1
    let minutes = floor(minutesFloat)

    // (1.5 - 1) * 60 = 30.01
    let secondsFloat = (minutesFloat - minutes) * 60

    // 30.01 = 30
    let secs = floor(secondsFloat)

    // (30.01 - 30) * 100 = 1.0
    let secsDec = floor((secondsFloat - secs) * 100)

    return String(format: "%02d:%02d:%02d", Int(minutes), Int(secs), Int(secsDec))
}

Sprite kit倒计时SKLabel

2 个答案: