Repeat an animation a variable number of times

Question

I was wondering how I can set an animation to repeat. The number of repetitions needs to be determined by a variable. In the following code, the variable int newPage

Answer 1

To avoid the hiccup between animations, use keyframes. I wrote an extension that works on anything conforming to UIView (which is a ton of visual elements)

Swift 4:

import UIKit
extension UIView{
    func rotate(count: Float, _ complete: @escaping ()->()) {
        UIView.animateKeyframes(withDuration: 1.0, delay: 0, options: [.repeat], animations: {
            //to rotate infinitely, comment the next line
            UIView.setAnimationRepeatCount(count)
            //rotate the object to 180 degrees
            UIView.addKeyframe(withRelativeStartTime: 0, relativeDuration: 0.5/1.0, animations: {
                self.transform = CGAffineTransform(rotationAngle: (CGFloat(Double.pi)))
            })
            UIView.addKeyframe(withRelativeStartTime: 0, relativeDuration: 0.5/1.0, animations: {
                //rotate the object from 180 to 360 degrees
                self.transform = CGAffineTransform(rotationAngle: (CGFloat(Double.pi * 2)))
            })
        }, completion:{ _ in
            complete()
        })
    }
}

To call it anywhere in the app:

view.rotate() { /*do after*/ }