CODEWITHSUNDEEP
iosswiftsprite-kit
Nick Groeneveld
Nick Groeneveld

Reputation: 903

How to set up position movements for background nodes

How can I set up background animations only once and make them move forever?

I'm developing a game using iOS Swift and SpriteKit. I have a lot of background nodes in my game, like clouds, mountains, etc.

Currently I'm moving clouds around the scene like this. This code is in the override func update:

        if self.cloud01.position.x < 0 - self.cloud01.size.width {
            self.cloud01.position.x = self.frame.size.width + (self.cloud01.size.width / 2)
        } else {
            self.cloud01.position.x -= 0.5
        }

Whenever the cloud moves out of the scene (left side) it will be reset to the right side and move again.

I want to take all these if-statements out of the update function and set them up only once. I've tried this:

//This is in my didMoveToView
runAction(SKAction.repeatActionForever(SKAction.runBlock(backgroundAnimations)))

//It calls this function
func backgroundAnimations() {

        if self.cloud01.position.x < 0 - self.cloud01.size.width {
            self.cloud01.position.x = self.frame.size.width + (self.cloud01.size.width / 2)
        } else {
            self.cloud01.position.x -= 0.5
        }
}

How can I set up background animations only once and make them move forever?

Thanks!

Upvotes: 2

Views: 69

Answers (1)

Darvas
Darvas

Reputation: 974

You can use SKActions. Simply add this line when you initialize your clouds.

world - your clouds parentNode (probably you need to replace with self)

    runAction(SKAction.repeatActionForever(SKAction.sequence([
        SKAction.moveByX(-world.frame.size.width , y: 0, duration: 10.0),
        SKAction.moveByX(world.frame.size.width , y: 0, duration: 0),
    ])))

Upvotes: 3

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