CODEWITHSUNDEEP
iosobjective-cswiftsprite-kit
lorenzo
lorenzo

Reputation: 1743

repeat action forever with different durations

I'm pretty new to Sprite Kit and I'm trying to develop a game where some monsters are moving around forever using this code.

    return SKAction.sequence([
        SKAction.runBlock({ self.moveMonster(monster) }),
        SKAction.waitForDuration(monster.movementSpeed())
    ])

The thing is that I would like the wait duration to vary using the monster speed, which is a function.

This code doesn't achieve what I'm trying to do because the movementSpeed function is called only once.

Thank you very much for your help!

Upvotes: 2

Views: 1298

Answers (2)

rakeshbs
rakeshbs

Reputation: 24572

You can use the completionHandler in runAction to add a different SKAction sequence each time to change your wait duration. For example.

func addSKAction(waitDuration : NSTimeInterval)
{
    let moveSprite = SKAction.runBlock({ () -> Void in
        self.moveMonster(monster)
    })

    let waitDuration = SKAction.waitForDuration(waitDuration)

    let sequence = SKAction.sequence([moveSprite,waitDuration])

    spriteNode.runAction(sequence, completion: { () -> Void in

        addSKAction(waitDuration) // Change wait duration each time.

    })
}

Change the value of the waitDuration variable each time.

If you just want to randomly change waitDuration, you can use SKAction.waitForDuration:withRange:

let moveSprite = SKAction.runBlock({ () -> Void in
    self.moveMonster(monster)
})

let waitDuration = SKAction.waitForDuration(5, withRange: 4)

let sequence = SKAction.repeatActionForever(SKAction.sequence([moveSprite,waitDuration]))

This will change the waitDuration from (5 - range/2) = 3 to (5 + range/2) = 7 randomly.

Upvotes: 2

hamobi
hamobi

Reputation: 8130

i wouldnt use an action in this case. when a timer needs to vary I think it makes more sense to use your update method.

declare two properties to your scene

var monsterTimer: NSTimerInterval(2)
var monsterInterval: NSTimerInterval(2)

in your update method

self.monsterTimer -= self.delta

if self.monsterTimer <= 0 {

    self.moveMonster(monster)

    // change the value of monsterInterval if you need to change the delay
    self.monsterTimer = self.monsterInterval  
}

Upvotes: 1

Related Questions