Animate background UIImage - ios

Question

I have this asset as the background of a view and its assigned to the background using the code described below.
The animation is to get the diagonal rows animate, so they move from left to right when the loading is happening.
Any pointers of how to get this done?
var view = UIImageView()
view.translatesAutoresizingMaskIntoConstraints = false
view.image = UIImage(assetIdentifier: "background-view")
view.layer.cornerRadius = 8.0
view.layer.masksToBounds = true
view.contentMode = .ScaleAspectFill
view.clipsToBounds = true
view.backgroundColor = UIColor.whiteColor()
return view
"background-view" is here

Answer 1

I guess the best would be to have all the images needed ( all the frames ) to create the animated image you want and then put these images in UIImageView's animationImages property.
For instance, if you get a loading bar gif loading_bar.gif, you can get all the different images in that gif ( c.f. this tutorial among others : http://www.macobserver.com/tmo/article/preview-extracting-frames-from-animated-gifs ).
Load all the images in your code ( in the assets folder for instance ) and then do something like :
func getAnimatedImages -> Array<UIImage>
{
var animatedImages = Array<UIImage>()
var allImagesLoaded = false
var i = 0
while !allImagesLoaded
{
if let image = UIImage(named: "background_" + String(i))
{
animatedImages.append(image)
i++
}
else
{
allImagesLoaded = true
}
}
return animatedImages
}
( if you called your images background_0, background_1, etc... )
and then
self.yourBackgroundImageView.animationImages = self.getAnimatedImages
self.yourBackgroundImageView.startAnimating()

Answer 2

I would use the method class func animatedImageNamed(_ name: String, duration duration: NSTimeInterval) -> UIImage?
From the Apple doc:
this method would attempt to load images from files with the names ‘image0’, ‘image1’ and so on all the way up to ‘image1024’. All images included in the animated image should share the same size and scale.
If you create an animated image you can assign it to your UIImageView and it will animate automatically.
As for the image creation #Randy had a pretty good idea :)