Using a loop for adding attributes to multiple UIImageViews

Question

I have 8 UImageViews that I am adding animations to. I know I can make the animation eight times, but can I use a loop -and maybe interpolation- for it?

He

Answer 1

To create the animationImages, I would do this:

dieImage0.animationImages = (0..<4).reduce([UIImage]()) { images, _ in
    return images + (1..<7).map { UIImage(named: "dicey-die\($0)")! }
}

It looks like animationImages consists of 24 UIImages - 4 sets of 6 images, where the name of the image is "dicey-dieN", (N is replaced by a number in the range (1..<7).)

You can create a single array of six images like this:

let images = (1..<7).map { UIImage(named: "dicey-die\($0)")! }

You want to do that 4 times, and add all the arrays together. You do that with the call to (0..<4).reduce([UIImage]()) { ... }

The result will be a single array with 24 images.

Then, as @Chris Slowik suggested, create an array of dieImages and then loop through them to assign the random image:

let dieImages = [dieImage0, dieImage1, dieImage2, dieImage3, dieImage4, dieImage5, dieImage6, dieImage7]

for dieImage in dieImages {
    dieImage.image = randomImages.randomDice()
    dieImage.startAnimating()
}

Your entire motionEnded method should probably look something like this:

override func motionEnded(motion: UIEventSubtype, withEvent event: UIEvent) {
    let dieImages = [dieImage0, dieImage1, dieImage2, dieImage3, dieImage4, dieImage5, dieImage6, dieImage7]

    for dieImage in dieImages {
        dieImage.image = randomImages.randomDice()
        dieImage.startAnimating()
    }

}

I think you were running into problems with dieImage0 because you were starting the animation before you assigned it a random image. Assign the image first, and then start animating.