Swift - Animate dynamically created UIImageView - ios

Question

Initially I had this code working when I was just animating the one UIImageView that I had. But then I changed it to animate several dynamically created UIImageViews, however since they are dynamically created inside a for loop, I'm finding it difficult to animate them as I did the initial one.
override func viewDidLoad() {
super.viewDidLoad()
var sprite: UIImage = UIImage(named: "sprites/areaLocatorSprite.png")!
var locations:NSArray = animal[eventData]["locations"] as NSArray
for var i = 0; i < locations.count; i++ {
println(locations[i]["locationx"])
var locationx = locations[i]["locationx"] as String
var locationy = locations[i]["locationy"] as String
let x = NSNumberFormatter().numberFromString(locationx)
let y = NSNumberFormatter().numberFromString(locationy)
let cgfloatx = CGFloat(x!)
let cgfloaty = CGFloat(y!)
var mapSprite: UIImageView
mapSprite = UIImageView(image: sprite)
mapSprite.frame = CGRectMake(cgfloatx,cgfloaty,10,10)
townMap.addSubview(mapSprite)
timer = NSTimer.scheduledTimerWithTimeInterval(0.35, target: self, selector: Selector("flash"), userInfo: nil, repeats: true)
}
}
func flash() {
var mapSprite:UIImageView?
if mapSprite?.alpha == 1 {
mapSprite?.alpha = 0
} else {
mapSprite?.alpha = 1
}
}
This does not work as the mapSprite in the flash function is different to the one in the for loop. How can I refer to the one in the for loop and then animate it? Or would there be a better alternative to what I'm currently doing?
Many thanks!
EDIT
Using Xcode 6.2

Answer 1

You need to store the views into a property and then enumerate that property each time your timer event is fired
var sprites: [UIImageView]?
override func viewDidLoad() {
super.viewDidLoad()
var sprite = UIImage(named: "sprites/areaLocatorSprite.png")!
var locations:NSArray = animal[eventData]["locations"] as NSArray
self.sprites = map(locations) {
var locationx = $0["locationx"] as String
var locationy = $0["locationy"] as String
let x = NSNumberFormatter().numberFromString(locationx)
let y = NSNumberFormatter().numberFromString(locationy)
let cgfloatx = CGFloat(x!)
let cgfloaty = CGFloat(y!)
var mapSprite = UIImageView(image: sprite)
mapSprite.frame = CGRectMake(cgfloatx,cgfloaty,10,10)
townMap.addSubview(mapSprite)
return mapSprite
}
timer = NSTimer.scheduledTimerWithTimeInterval(0.35, target: self, selector: Selector("flash"), userInfo: nil, repeats: true)
}
func flash() {
if let sprites = self.sprites {
for sprite in sprites {
sprite.alpha = sprite.alpha == 0 ? 1 : 0
}
}
}