Animation Grow/Decrease Size imageView iOS - ios

Question

I'm trying to animate a custom button using CGAffineTransformMakeScale as follows:
if (stateButton == 0) { //The button is gonna appear
self.selected = YES;
self.imageView.transform = CGAffineTransformMakeScale(0.01, 0.01);
[UIView animateWithDuration:0.5 delay:0 options:UIViewAnimationOptionCurveEaseOut animations:^{
// animate it to the identity transform (100% scale)
self.imageView.transform = CGAffineTransformIdentity;
} completion:nil];
}
else if (stateButton ==1) { //The button is gonna disappear
self.imageView.transform = CGAffineTransformMakeScale(1, 1);
[UIView animateWithDuration:0.5 delay:0 options:UIViewAnimationOptionCurveEaseOut animations:^{
// decrease button
self.imageView.transform = CGAffineTransformMakeScale(.01, .01);
} completion:^(BOOL finished){
self.selected = NO;
}];
}
The button grows perfectly to the original size, however, i don't know the reason but when i click on the button to decrease it, it decreases from a size like 100% bigger than the original size to the original size, instead of beginning the decrease in the original size and achieve an scale of 0.01 as I indicated in the code.
Please help!!

Answer 1

You can animate the grow and decrease size of the image view using the following code
[UIView animateWithDuration:2.0 animations:^{
self.imageView.transform = CGAffineTransformMakeScale(0.5, 0.5);
}
completion:^(BOOL finished){
[UIView animateWithDuration:2.0 animations:^{
self.imageView.transform = CGAffineTransformMakeScale(1, 1);
}];
}];
This will make the imageview decrease in size initially and when animation is over it will get back to its original size with an animation.

Answer 2

SWIFT 3 Version
UIView.animate(withDuration: 2.0, animations: {() -> Void in
self.imageView?.transform = CGAffineTransform(scaleX: 0.5, y: 0.5)
}, completion: {(_ finished: Bool) -> Void in
UIView.animate(withDuration: 2.0, animations: {() -> Void in
self.imageView?.transform = CGAffineTransform(scaleX: 1, y: 1)
})
})