Question

我是编程的新手所以请帮忙。我正在尝试设置间隔以在整个游戏中创建各种Sprite节点（使用更新功能）。但是，每个Sprite节点都需要以不同的间隔生成。我有一堆“if”语句，它似乎导致我的帧速率下降并导致应用程序滞后。有人可以告诉我如何解决这个问题吗？如果可能的话，请向我解释为什么要这样做，这样我才能更好地理解编码过程。谢谢！

var timeBetweenBirds: Int!
var timeBetweenBadBirds: Int!
var timeBetweenSubtractTimeBirds: Int!
var timeBetweenAddTimeBirds: Int!
var timeBetweenBonusBirds: Int!

var now : NSDate?
var nextTime : NSDate?
var badBirdNextTime: NSDate?
var subtractTimeBirdNextTime: NSDate?
var addTimeBirdNextTime: NSDate?
var bonusBirdNextTime: NSDate?

override func update(currentTime: CFTimeInterval) {

 timeBetweenBirds = Int(arc4random_uniform(3))
 timeBetweenBadBirds = Int(arc4random_uniform(3) + 2)
 timeBetweenSubtractTimeBirds = Int(arc4random_uniform(3) + 2)
 timeBetweenAddTimeBirds = Int(arc4random_uniform(1) + 5)
 timeBetweenBonusBirds = Int(arc4random_uniform(20) + 20)


now = NSDate()

  if now?.timeIntervalSince1970 > nextTime?.timeIntervalSince1970 {

        nextTime = now?.dateByAddingTimeInterval(NSTimeInterval(timeBetweenBirds))

        createBird()
    }

    if now?.timeIntervalSince1970 > badBirdNextTime?.timeIntervalSince1970 {

        badBirdNextTime = now?.dateByAddingTimeInterval(NSTimeInterval(timeBetweenBadBirds))

        createBadBird()

    }

    if now?.timeIntervalSince1970 > subtractTimeBirdNextTime?.timeIntervalSince1970 {

        subtractTimeBirdNextTime = now?.dateByAddingTimeInterval(NSTimeInterval(timeBetweenSubtractTimeBirds))

        createSubtractTimeBird()

    }

    if now?.timeIntervalSince1970 > addTimeBirdNextTime?.timeIntervalSince1970 {

        addTimeBirdNextTime = now?.dateByAddingTimeInterval(NSTimeInterval(timeBetweenAddTimeBirds))

        createAddTimeBird()

    }

    if now?.timeIntervalSince1970 > bonusBirdNextTime?.timeIntervalSince1970 {

        bonusBirdNextTime = now?.dateByAddingTimeInterval(NSTimeInterval(timeBetweenBonusBirds))

        createBonusBird()

    }

Answer 1

也许这不是正确的解决方案，但它至少可以简化事情。

需要考虑的几件事情。

现在，您在每个timeBetweenBirds循环中生成一个新的update值，但如果您最终在if语句中，则只会使用它/ p>

override func update(currentTime: CFTimeInterval) {

    timeBetweenBirds = Int(arc4random_uniform(3)) //Created on each update loop
    ...
    now = NSDate()

    if now?.timeIntervalSince1970 > nextTime?.timeIntervalSince1970 {
        //Only used here           
        nextTime = now?.dateByAddingTimeInterval(NSTimeInterval(timeBetweenBirds)) 
        createBird()
    }

因此，开始的地方可能是仅在需要时更新timeBetweenBirds值。

在我看来，您不需要创建所有这些日期并在它们之间进行比较。

每次调用update时，您都可以免费获得currentTime属性:-)此属性可用于检查nextTime变量，如下所示：

var nextTime: CFTimeInterval = 0
...
override func update(currentTime: CFTimeInterval) {
    if currentTime > nextTime {
        nextTime = currentTime + CFTimeInterval(arc4random_uniform(3))
        createBird()
    }
    //And so on with your other if statements
}

正如我所说，我不知道这是否会加快速度，但它会简化您的代码，这总是很好： - ）

Answer 2

我总是给每个更新调用它自己的时序变量的函数，这样它就不必每1/60秒运行这么多的代码块。例如：

var timeOfLastUpdateForUserMotion:CFTimeInterval = 0

func processUserMotionForUpdate(currentTime: CFTimeInterval){
    if (currentTime - timeOfLastUpdateForUserMotion > 0.1) {
        ...
        timeOfLastUpdateForUserMotion = currentTime
    }
}
override func update(currentTime: CFTimeInterval) {
    processUserMotionForUpdate(currentTime)
}

在这种特殊情况下，我每3帧检查一次加速度计。在你的情况下：

var timeOfLastUpdateForRandomVariable
var birdOneInterval:Double = 0
var birdTwoInterval:Double = 0

func updateRandomVariables(currentTime:CFTimeInterval){
    if (currentTime - timeOfLastUpdateForRandomVariable > 1.0){
        birdOneInterval = Int(arc4random_uniform(3)+1)
        birdTwoInterval = Int(arc4random_uniform(3) + 2)
        timeOfLastUpdateForRandomVariable = currentTime
    }
}
    override func update(currentTime: CFTimeInterval) {
        updateRandomVariables(currentTime)
    }

确保没有获得间隔，例如，birdOneInterval太接近于零，或者你可以获得飞到各处的鸟类的机枪效果;偶尔发生在我身上。

具有多个间隔的更新功能（SWIFT）

2 个答案: