Previously, with Objective-C I could use performSelector: in order to repeat an action after a random period of time which could vary between 1-3 seconds. But since I'm not able to use performSelector: in Swift, I've tried using "NSTimer.scheduledTimerWithTimeInterval". And it works in order to repeat the action. But there is a problem. On set the time variable to call a function that will generate a random number. But it seems that NSTimer uses the same number every time it repeats the action.
What that means is that the action is not performed randomly, but instead, after a set period of time that is generated randomly at the beginning of the game and it is used during all the game.
The question is: Is there any way to set the NSTimer to create a random number every time it executes the action? Or should I use a different method? Thanks!
@LearnCocos2D is right... use SKActions
or the update
method in your scene. Here is a basic example of using update
to repeat an action after a random period of time.
class YourScene:SKScene {
// Time of last update(currentTime:) call
var lastUpdateTime = NSTimeInterval(0)
// Seconds elapsed since last action
var timeSinceLastAction = NSTimeInterval(0)
// Seconds before performing next action. Choose a default value
var timeUntilNextAction = NSTimeInterval(4)
override func update(currentTime: NSTimeInterval) {
let delta = currentTime - lastUpdateTime
lastUpdateTime = currentTime
timeSinceLastAction += delta
if timeSinceLastAction >= timeUntilNextAction {
// perform your action
// reset
timeSinceLastAction = NSTimeInterval(0)
// Randomize seconds until next action
timeUntilNextAction = CDouble(arc4random_uniform(6))
}
}
}
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