How do I make 'n' number of SKSpriteNode move in all direction continuously Swift? - swift

Question

I want 'n' number of nodes keep moving in all direction continuously.
Below is how I coded
func spriteCollection(count : Int) -> [SKSpriteNode]{
var spriteArray = [SKSpriteNode]()
for _ in 0..<count {
let sprite = SKSpriteNode(imageNamed: "node.png")
//giving random position to sprites,
let x = CGFloat(arc4random_uniform(UInt32(((self.scene?.frame.width)! - sprite.size.width))))
let y = CGFloat(arc4random_uniform(UInt32(((self.scene?.frame.height)! - sprite.size.height))))
sprite.position = CGPoint(x: x, y: y)
spriteArray.append(sprite)
}
return spriteArray
}
override func didMoveToView(view: SKView) {
//here if I pass more than 2, the nodes won't even get displayed sometimes
let spriteCollection = spriteCollection(2)
for sprite in spriteCollection{
let blockOFaction = SKAction.runBlock({
let x = CGFloat(arc4random_uniform(UInt32(((self.scene?.frame.width)! - sprite.size.width))))
let y = CGFloat(arc4random_uniform(UInt32(((self.scene?.frame.height)! - sprite.size.height))))
let action = SKAction.moveTo(CGPoint(x: x , y: y), duration: 2)
print("moving to \(x,y)")
action.speed = 3.0
sprite.runAction(action)
})
let waitAction = SKAction.waitForDuration(1)
sprite.runAction(SKAction.repeatActionForever(SKAction.sequence([blockOFaction, waitAction])))
addChild(sprite)
}
}
The nodes are moving randomly in all direction, but if I add more than 2 sprites, sometimes none of the sprites are visible(just a blank screen) and also I want to increase the number of sprites eventually. Here what I'm doing is, just passing the number of sprites I want(It cannot be increased eventually) So is there any other way to do it. Could anyone please suggest me how can I achieve this..