ios UIView animation curves

Question

Is there any way to do things the "short and easy" way like below? The curve appears to still use EaseOut.

[UIView setAnimationCurve:UIViewAnimationCurveEaseIn];
[UIView animateWithDuration:0.5 animations:^{
    // ... do stuff here
}];

Answer 1

You are mixing two different kinds of UIView-animations. You should be using something like this either of these:

[UIView animateWithDuration:0.5
                      delay:0.0
                    options:UIViewAnimationOptionCurveEaseIn
                 animations:^{
                    // ... do stuff here
               } completion:NULL];

This came from the newer block-based UIView-animation API. The first line, on the other hand, is part of the older UIView animation API that looks like this:

[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.5];
[UIView setAnimationCurve:UIViewAnimationCurveEaseIn];
// ... do stuff here
[UIView commitAnimations];

They do the same thing and you can use either (though Apple recommends the block-based API since it is easier/cleaner to do callbacks after the animation finishes).

Answer 2

You can do it using Core Animation , CAKeyFrameAnimation to define the curve points. See this tutorial: http://nachbaur.com/blog/core-animation-part-4