How to make a circular UIView

Question

I want to make a UIView or UIImageView that is a circle. Or a circle that i can change the size of using a slider, and the color of with a pickerview.

Answer 1

// For those looking to round the corners of an image view
imageView.layer.cornerRadius = imageView.bounds.size.width/2;
imageView.layer.masksToBounds = YES;