How to replicate the Scale Up Animation when an app starts regularly (push app icon on HomeScreen) on an iPhone

Question

i want to replicate the animation when an app starts on iPhone. There is the first view scaling up from 50 % to 100% i think. later I want to use this as a transition betwee

Answer 1

You can apply a scale transform to the UIView and then animate it back to it's normal state.

// Set the the view's scale to half
[viewToScale setTransform:CGAffineTransformMakeScale(0.5,0.5)];

// Set the transform back to normal (identity) in an animation when you're
// ready to animate
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:1.0];
[viewToScale setTransform:CGAffineTransformIdentity];
[UIView commitAnimations];

The trick will be you will need to set the view to the smaller scale in a separate run cycle from the animation or you won't see the view animate. So you can set the smaller scale and then call -performSelector:withObject:afterDelay: to actually perform the animation.