Activity indicator with custom image

Question

I am loading a UIWebView and in the meantime I wan\'t to show a blank page with this activity indic

Answer 1

Swift 5.0 version of accepted Answer

public extension UIImageView {
  func spin(duration: Float) {
    let rotation = CABasicAnimation(keyPath: "transform.rotation")
    rotation.fromValue = 0
    rotation.toValue = 2 * Double.pi
    rotation.duration = 0.7
    rotation.repeatCount = duration
    layer.add(rotation, forKey: "spin")
  }

  func stopSpinning() {
    layer.removeAllAnimations()
  }
}