Is there a way to change the speed of scrollRectToVisible?

Question

Is there a way to change how quickly scrollRectToVisible animates when scrolling a UIScrollView?

Answer 1

Just set the animation argument to NO and then perform your own animation using the UIView's animation class methods.

[UIView animateWithDuration:1.0f delay:0.0f options:UIViewAnimationOptionCurveEaseOut animations:^{
    [scrollView scrollRectToVisible:viewFrame animated:NO];
} completion:nil];

Answer 2

No, not with public methods. The duration is fixed at 0.3 seconds.

There is a private, undocumented API to change the duration:

@interface UIScrollView(UIScrollViewInternal)
-(void)_setContentOffsetAnimationDuration:(NSTimeInterval)duration;
@end

but as all undocumented API, using this will lead to rejection from AppStore.