How would I pause my background when my heroNode makes in contact with the enemyNode in Swift Spritekit?

Question

I'm trying to pause my background when my hero node makes contact with the enemy. When I use this code I posted below the speed of the background doesn't stop it keeps going its normal speed. I tried declaring the "city" globally only but I get an error saying Attempted to add a SKNode which already has a parent. What am I doing wrong?

class GameScene: SKScene, SKPhysicsContactDelegate {    
    let city = SKSpriteNode(imageNamed: "skyline")
}

override func didMoveToView(view: SKView) {
    repeatCity()
}


func addCity() {
    let city = SKSpriteNode(imageNamed: "skyline")
    let moveToRight = SKAction.moveByX(-1000, y: 0, duration: 5.0)
    let repeatAction = SKAction.repeatActionForever(moveToRight)



    city.position = CGPointMake(self.size.width / 0.7, self.size.height / 1.9)
    city.zPosition = 13
    city.setScale(0.9)
    city.runAction(repeatAction)
    addChild(city)


}

func repeatCity() {
    let generateBlocks = SKAction.sequence([
        SKAction.runBlock(self.addCity),
        SKAction.waitForDuration(3.5)])
    let endlessAction = SKAction.repeatActionForever(generateBlocks)
    runAction(endlessAction)

}
    func didBeginContact(contact:SKPhysicsContact){

    if firstBody.categoryBitMask == HeroCategory && fourthBody.categoryBitMask == EnemyCategory {

        city.speed = 0
        theHero.physicsBody?.affectedByGravity = true
        println("contactwithEnemy!!!")

    }
}

Christian · Answer 1 · 2015-05-08T16:45:18.603

0

The first problem is, that you declare a class variable city but in your add method you use not the class variable but an own city-variable. So you should remove that class variable:

let city = SKSpriteNode(imageNamed: "skyline")

Now at the moment, the action which you repeat for ever on your city node keeps running. To stop that action you should remove all actions from the city node at contact:

self.removeAllActions()

edited May 08 '15 at 16:45

answered May 08 '15 at 16:22

Christian

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Its still moving when I add it to the contact between the hero and enemy. – newtocoding May 08 '15 at 16:24
Does the if in the didBeginContact really happen? – Christian May 08 '15 at 16:26
Do you know if it could be anything else? – newtocoding May 08 '15 at 16:30
I've found the problem. You've declared city as a class variable but you don't use it in your addCity method. Remove the city-variable which you declare inside the addCity method and my code should work – Christian May 08 '15 at 16:33
the background is sill moving when I do this. – newtocoding May 08 '15 at 16:37
Try self.removeAllActions() – Christian May 08 '15 at 16:39
When I remove the city variable inside the addCity method I get an error saying "Attemped to add a SKNode which already has a parent". Also the self.removeAllActions() doesnt work either. – newtocoding May 08 '15 at 16:42
I think its the repeatCity() function thats not allowing me to pause the background. – newtocoding May 08 '15 at 16:52

How would I pause my background when my heroNode makes in contact with the enemyNode in Swift Spritekit?

1 Answers1