Rotate a view for 360 degrees indefinitely in Swift?

Question

I want to rotate an image view for 360 degrees indefinitely.

UIView.animate(withDuration: 2, delay: 0, options: [.repeat], animations: {
    self.view.transf         


        

Answer 1

Use this extension to rotate UIImageView 360 degrees.

extension UIView {
func rotate360Degrees(duration: CFTimeInterval = 1.0, completionDelegate: AnyObject? = nil) {
    let rotateAnimation = CABasicAnimation(keyPath: "transform.rotation")
    rotateAnimation.fromValue = 0.0
    rotateAnimation.toValue = CGFloat(M_PI)
    rotateAnimation.duration = duration

    if let delegate: CAAnimationDelegate = completionDelegate as! CAAnimationDelegate? {
        rotateAnimation.delegate = delegate
    }
    self.layer.addAnimation(rotateAnimation, forKey: nil)
}
}

Than to rotate UIImageView simply use this method

self.YOUR_SUBVIEW.rotate360Degrees()

Answer 2

I would stick it in a function like rotateImage() and in the completion code just call rotateImage() again. I think you should use M_PI (or the swift equivalent) for the rotation amount, though.

Answer 3

This one work for me in Swift 2.2:

let rotationAnimation = CABasicAnimation(keyPath: "transform.rotation.z")
rotationAnimation.fromValue = 0.0
rotationAnimation.toValue = 360 * CGFloat(M_PI/180)
let innerAnimationDuration : CGFloat = 1.0
rotationAnimation.duration = Double(innerAnimationDuration)
rotationAnimation.repeatCount = HUGE
self.imageView.addAnimation(rotationAnimation, forKey: "rotateInner")

Answer 4

On your tabBarController, make sure to set your delegate and do the following didSelect method below:

func tabBarController(_ tabBarController: UITabBarController,
                          didSelect viewController: UIViewController) {
        if let selectedItem:UITabBarItem = tabBarController.tabBar.selectedItem {
            animated(tabBar: tabBarController.tabBar, selectedItem: selectedItem)
        }
    }




fileprivate func animated(tabBar: UITabBar, selectedItem:UITabBarItem){
        if let view:UIView = selectedItem.value(forKey: "view") as? UIView {
            if let currentImageView = view.subviews.first as? UIImageView {
                rotate(imageView: currentImageView, completion: { (completed) in
                    self.restore(imageView: currentImageView, completion: nil)
                })
            }
        }
    }

    fileprivate func rotate(imageView:UIImageView, completion:((Bool) ->Void)?){
        UIView.animate(withDuration: animationSpeed, delay: 0.0, options: .curveLinear, animations: {
            imageView.transform = CGAffineTransform.init(rotationAngle: CGFloat.pi)
        }, completion: {
            (value: Bool) in
            completion?(value)
        })
    }

    fileprivate func restore(imageView:UIImageView, completion:((Bool) ->Void)?){
        UIView.animate(withDuration: animationSpeed, delay: 0.0, options: .curveLinear, animations: {
            imageView.transform = CGAffineTransform.identity
        }, completion: {
            (value: Bool) in
            completion?(value)
        })
    }

Answer 5

Try this one it works for me, i am rotating image for once

 UIView.animateWithDuration(0.5, delay: 0.0, options: .CurveLinear, animations: {

       self.imgViewReload.transform = CGAffineTransformRotate(self.imgViewReload.transform, CGFloat(M_PI))

 }, completion: {
    (value: Bool) in

          UIView.animateWithDuration(0.5, delay: 0.0, options: .CurveLinear, animations: {
          self.imgViewReload.transform = CGAffineTransformIdentity

         }, completion: nil)
 })

Answer 6

Swift 2.x way to rotate UIView indefinitely, compiled from earlier answers:

// Rotate <targetView> indefinitely
private func rotateView(targetView: UIView, duration: Double = 1.0) {
    UIView.animateWithDuration(duration, delay: 0.0, options: .CurveLinear, animations: {
        targetView.transform = CGAffineTransformRotate(targetView.transform, CGFloat(M_PI))
    }) { finished in
        self.rotateView(targetView, duration: duration)
    }
}

UPDATE Swift 3.x

// Rotate <targetView> indefinitely
private func rotateView(targetView: UIView, duration: Double = 1.0) {
    UIView.animate(withDuration: duration, delay: 0.0, options: .curveLinear, animations: {
        targetView.transform = targetView.transform.rotated(by: CGFloat(M_PI))
    }) { finished in
        self.rotateView(targetView: targetView, duration: duration)
    }
}