Zooming out animation Swift

Question

I'm trying to do some animation for a UIImageView (only zooming out)

1- I set the frame to be bigger than the screen to make it zoomed in like so :

private lazy var imageView: UIImageView = {
    let image = UIImageView()
    image.frame = CGRect(x: 0, y: 0, width: view.frame.width + 300, height: view.frame.height + 300)
    image.center = view.center
    image.image = UIImage(named: "1111")
    image.contentMode = .scaleAspectFill
    return image
}()

and I want to make the frame go back to the screen size like so :

func firstAnimation() {
    UIView.animate(withDuration: 15, animations: {

        // HERE 
        self.imageView.frame = CGRect(x: 0, y: 0, width: self.view.frame.width, height: self.view.frame.height)

    }) { (finished) in
        self.secondAnimation()
    }
}

I didn't work with me unfortunately.

Here the full class code : github

Answer 1

Swift 4+

Use CGAffineTransform.identity to resize your image to it's first identity

UIView.animate(withDuration: 0.5, delay: 0.0, options: UIViewAnimationOptions.curveEaseIn, animations: {
        
       // HERE
       self.imageview.transform = CGAffineTransform.identity.scaledBy(x: 2, y: 2) // Scale your image

 }) { (finished) in
     UIView.animate(withDuration: 1, animations: {
       
      self.imageview.transform = CGAffineTransform.identity // undo in 1 seconds

   })
}

Answer 2

Code for zoom in:

[UIView animateWithDuration:1.0 animations:^{
    imgv.transform = CGAffineTransformMakeScale(1.0,1.0);
}completion:^(BOOL finished){
}];

Code for zoom out:

[UIView animateWithDuration:1.0 animations:^{
    imgv.transform = CGAffineTransformMakeScale(0.1,0.1);           
}completion:^(BOOL finished){
    imgv.transform = CGAffineTransformMakeScale(.0,.0);    
}];

Here imvv is my UIImageview object. You can replace it with your view object. In zoom out code we hide the view by scaling it to 0.