How can I stop the animation to overlap while moving my character - ios

Question

I have 2 different textures for my character that overlap/are displayed too fast
while moving the character. How can I set a duration for the animation, so the textures always switch at the same speed while moving the character?
This is my code:
override func touchesMoved(touches: NSSet, withEvent event: UIEvent) {
for touch: AnyObject in touches {
let location = touch.locationInNode(self)
let animatePlayerStart = SKAction.setTexture(SKTexture(imageNamed: "Player\(i).png"))
// Determine speed for character movement
var minDuration:CGFloat = 0.7;
var maxDuration:CGFloat = 1.8;
var rangeDuration:CGFloat = maxDuration - minDuration;
var actualDuration:NSTimeInterval = NSTimeInterval((CGFloat(arc4random())%rangeDuration) + minDuration)
let move = SKAction.moveTo(location, duration:actualDuration)
player.runAction(SKAction.sequence([animatePlayerStart, move]))
// i determines which texture is going to be displayed
if(self.i == 2) {
self.i = 1
}
else{
self.i++
}
}
}

Answer 1

You are changing texture in touchesMoved which is called fast, thus the effect you are currently getting. To change textures after pre-defined period of time you can use this method:
+ animateWithTextures:timePerFrame:
import SpriteKit
class GameScene: SKScene {
let hero = SKSpriteNode(imageNamed: "heroState_A")
let textureA = SKTexture(imageNamed: "heroState_A")
let textureB = SKTexture(imageNamed: "heroState_B")
override func didMoveToView(view: SKView) {
/* Setup your scene here */
//Because hero is already initialized with textureA, start from textureB
let animation = SKAction.animateWithTextures([textureB,textureA], timePerFrame:0.5)
hero.position = CGPoint(x: CGRectGetMidX(frame), y: CGRectGetMidY(frame))
addChild(hero)
//Start animation
hero.runAction(SKAction.repeatActionForever(animation),withKey:"heroAnimation")
//Removing heroAnimation
//You can stop this animation by hero.removeAllActions, but if you run animation with key, you can remove just that particular action, which gives you more control
let stop = SKAction.runBlock({
if(self.hero.actionForKey("heroAnimation") != nil){
self.hero.removeActionForKey("heroAnimation")
}
})
//Just an example, in real app you will do this at certain events (eg. when player stops his movement)
runAction(SKAction.sequence([SKAction.waitForDuration(5),stop]))
}
}