Turn rectangular UIImageView into a circle - ios

Question

My ViewController has an UIImageView (lets name it img) as atribute, and in the beginning, it shows img in full screen, that is, its size is a rectangle similar to the ViewController bounds.
I'd like to do an animation with img, making it become a little circle (not just a rectangle with circular corners) and then move it to some corner of the ViewController.
How can I achieve this? I prefer not to send any code cos Im pretty sure I did it the wrong way (I tried to turn it into a square and then set a cornerRadius (with radius width/2), then making scale and translating position at once, but its a mess and works wrongly, so lets forget it)

Answer 1

Your solution sounds fine to me, but what might be going wrong, is the fact that animating corner radius is not supported by UIView.animateWithDuration as seen in the View Programming Guide for iOS. Therefor, the results are sometimes not whats expected.
You can try out the following code.
func animate() {
//Some properties that needs to be set on UIImageView
self.imageView.clipsToBounds = true
self.imageView.contentMode = .ScaleAspectFill
//Create animations
let cornerRadiusAnim = changeCornerRadiusAnimation()
let squareAnim = makeSquareAnimation()
let boundsAnim = changeBoundsAnimation()
let positionAnim = changePositionAnimation(CGPointMake(300,480))
//Use group for sequenced execution of animations
let animationGroup = CAAnimationGroup()
animationGroup.animations = [cornerRadiusAnim, squareAnim, boundsAnim, positionAnim]
animationGroup.fillMode = kCAFillModeForwards
animationGroup.removedOnCompletion = false
animationGroup.duration = positionAnim.beginTime + positionAnim.duration
imageView.layer.addAnimation(animationGroup, forKey: nil)
}
func makeSquareAnimation() -> CABasicAnimation {
let center = imageView.center
let animation = CABasicAnimation(keyPath:"bounds")
animation.duration = 0.1;
animation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionLinear)
animation.fromValue = NSValue(CGRect: imageView.frame)
animation.toValue = NSValue(CGRect: CGRectMake(center.x,center.y,imageView.frame.width,imageView.frame.width))
animation.fillMode = kCAFillModeForwards
animation.removedOnCompletion = false
return animation
}
func changeBoundsAnimation() -> CABasicAnimation {
let animation = CABasicAnimation(keyPath:"transform.scale")
animation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionLinear)
animation.fromValue = imageView.layer.mask?.valueForKeyPath("transform.scale")
animation.toValue = 0.1
animation.duration = 0.5
animation.beginTime = 0.1
animation.fillMode = kCAFillModeForwards
animation.removedOnCompletion = false
return animation
}
func changeCornerRadiusAnimation() -> CABasicAnimation {
let animation = CABasicAnimation(keyPath:"cornerRadius")
animation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionLinear)
animation.fromValue = 0
animation.toValue = imageView.frame.size.width * 0.5
animation.duration = 0.1
animation.fillMode = kCAFillModeForwards
animation.removedOnCompletion = false
return animation
}
func changePositionAnimation(newPosition: CGPoint) -> CABasicAnimation {
let animation = CABasicAnimation(keyPath: "position")
animation.fromValue = NSValue(CGPoint: imageView.layer.position)
animation.toValue = NSValue(CGPoint: newPosition)
animation.duration = 0.3
animation.beginTime = 0.6
animation.fillMode = kCAFillModeForwards
animation.removedOnCompletion = false
return animation
}

Answer 2

// try like this, i hope it will work for you.
UIView.animateWithDuration(3, delay: 0.0, options: UIViewAnimationOptions.CurveEaseIn, animations: { () -> Void in
img.layer.masksToBounds = true
img.layer.cornerRadius = img.frame.size.height / 2 // here img must be in square shape (height == width)
}) { (finished : Bool) -> Void in
}

Answer 3

option 1 call below method from code
// UIimageView Circle
class func roundImageView(imageView:UIImageView){
imageView.layer.borderWidth = 1.0
imageView.layer.masksToBounds = false
//imageView.layer.borderColor = UIColor.whiteColor().CGColor
imageView.layer.cornerRadius = imageView.frame.size.width/2
imageView.clipsToBounds = true
}
option 2 make user defined run time attributes from storyboard
view.layer.cornerRadius = 5.0f;
view.layer.masksToBounds = NO;