Swift Continuous Rotation Animation not so continuous

Question

Here is my code. Intent is to continuously rotate the UIImageView named swirls[l]. However, there is a small pause between every rotation start/end. I have gone through every si

Answer 1

Try below extension for swift 4.

extension UIView {
    func rotate360Degrees(duration: CFTimeInterval = 3) {
        let rotateAnimation = CABasicAnimation(keyPath: "transform.rotation")
        rotateAnimation.fromValue = 0.0
        rotateAnimation.toValue = CGFloat(Double.pi * 2)
        rotateAnimation.isRemovedOnCompletion = false
        rotateAnimation.duration = duration
        rotateAnimation.repeatCount=Float.infinity
        self.layer.add(rotateAnimation, forKey: nil)
    }
}

For start rotation.

MyView.rotate360Degrees()

And for Stop.

MyView.layer.removeAllAnimations()

You can use UIButton, UILabel and many more.

Answer 2

If you want to continuous rotate Button or View and stop that rotation whenever you want then you can try this: For start rotation:

@IBOutlet weak var RotateBtn: UIButton!
var timeTimer: Timer?

viewDidLoad()
{
  self.rotateView()
  timeTimer = Timer.scheduledTimer(timeInterval: 0.5, target: self, selector: #selector(self.rotateView), userInfo: nil, repeats: true)
}

func rotateView()
{
    UIView.animate(withDuration: 0.5, delay: 0, options: .curveLinear, animations: { () -> Void in
        self.RotateBtn.transform = self.RotateBtn.transform.rotated(by: CGFloat(M_PI_4))
    })
}

If you want to stop rotation then use:

@IBAction func StopBtn_Pressed(_ sender: AnyObject)
{
   timeTimer?.invalidate()
   self.RecordBtn.layer.removeAllAnimations()
} 

Answer 3

I'm not sure what's wrong with your code, but I've implemented continuous rotation using this method,

@IBAction func rotateView(sender: UIButton) {
    UIView.animate(withDuration: 0.5, delay: 0, options: .curveLinear, animations: { () -> Void in
        self.spinningView.transform = self.spinningView.transform.rotated(by: .pi / 2)
    }) { (finished) -> Void in
        self.rotateView(sender: sender)
    }
}