animate rotation UIImageView in swift

Question

I\'m trying to animate a rotation of 180 degrees of a UIImageView in Swift

    UIView.animateWithDuration(1.0, animations: { () -> Void in
              


        

Answer 1

Here is code to rotate imageview. swift 3.0

UIView.animate(withDuration:2.0, animations: {
            self.dropDownImage.transform = CGAffineTransform(rotationAngle: CGFloat(imageRotation))
        })

Answer 2

Try calling arrowImageView.layoutSubviews(), see below:

    UIView.animateWithDuration(1.0, animations: { () -> Void in
        self.arrowImageView.transform = CGAffineTransformMakeRotation(CGFloat(180 * M_PI))
        self.arrowImageView.layoutSubviews()
    }) { (succeed) -> Void in

    }

Answer 3

90 degrees rotation

var shouldRotateArrow = false {
    didSet {
        rotateArrow()
    }
}

private func rotateArrow() {
    let angle: CGFloat = shouldRotateArrow ? .pi / 2 : 0
    UIView.animate(withDuration: Constants.arrowRotationDuration) {
        self.arrowImageView.transform = CGAffineTransform(rotationAngle: angle)
    }
}

Answer 4

First of all, if you want to rotate 180 degrees, that has to translate to radians. 180 degrees in radians is pi. 360 degrees would be 2 * pi. 180 * pi would make your animation spin around 90 times in one second and end up with the original orientation.

Secondly, I'm not sure why your code isn't working, but I know that the code below does work:

let rotationAnimation = CABasicAnimation(keyPath: "transform.rotation")
rotationAnimation.fromValue = 0.0
rotationAnimation.toValue = M_PI
rotationAnimation.duration = 1.0

self.arrowImageView.layer.addAnimation(rotationAnimation, forKey: nil)

Answer 5

For me the best and shortest solution is (Swift 3/4):

self.YourImageView.transform = showing ? CGAffineTransform(rotationAngle: CGFloat.pi) : CGAffineTransform.identity

"showing" it's a value to determine is image rotated before or not - you can use your own logic here

Answer 6

Updated swift 4.0 version:

    let rotation: CABasicAnimation = CABasicAnimation(keyPath: "transform.rotation.z")
    rotation.toValue = Double.pi * 2
    rotation.duration = 0.25 // or however long you want ...
    rotation.isCumulative = true
    rotation.repeatCount = Float.greatestFiniteMagnitude
    yourView.layer.add(rotation, forKey: "rotationAnimation")