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objective-ccommitanimations

Steady Animation?

I am making a iPhone/iPad app with a cursor and music. I am running a timer every beat and moving it like so:

[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDelegate:self];
[UIView setAnimationDuration:theLength];
[UIView setAnimationBeginsFromCurrentState:YES];
theCursor.frame = CGRectMake(theX, 0, 6, 320);
[UIView commitAnimations];

However, it seems to start off fast then slow down as it gets to the end. Is there any way to make the animation steady?

Solution

  • That's the animation curve. By default it is set to UIViewAnimationCurveEaseInOut. Use setAnimationCurve: to set it to UIViewAnimationCurveLinear.

    You should also be aware that that way of animating is deprecated and Apple now recommend using the block-based animation style.