This is a quick note on a really nice UIImageView feature I discovered recently. It allows you to set up your custom activity indicator based on UIImageView. It makes use of animationImages property.

It works pretty easy. You just assign array of images to animationImages property and also set up animation duration and then call startAnimating. And that’s it.

To reduce the amount of images you should import into your project you can just apply simple transformations like rotations to one image. For example I took one image and rotated it 50 times producing more images. You can see the actual animation on the image below.

Since I was not paying attention to keeping bounds constant I received nice zooming as a side effect.

Check out my github project for actual code.