autoscrolling for UIScrollView

Question

Hi,

I used the setContentOffset method to scroll to a particular point automatically without user interaction.

[menuScrollView setContentOffset:CGPointMake(600.0,0) animated:YES]

but when i try to call the same method in a looping fashion inorder to slow down the speed of scrolling the scrolling never happens

for (int i = 1; i<=30; i++) {
        [menuScrollView setContentOffset:CGPointMake(600.0-i*10,0.0) animated:YES];
        NSLog(@"%f",600.0-i*10);        
    }

During the above piece of code the scrolling of UIScrollview happens only once (1st iteration( and it does not scroll for remaining 29 interations. What is the problem here ?

Answer 1

I think that when it's in a loop like this, the UI won't be updated.

Try using an NSTimer instead of putting it in a tight loop like this.

scrollTimer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(scrollView) userInfo:nil repeats:YES];

- (void) scrollView {
    CGFloat currentOffset = menuScrollView.contentOffset.x;
    CGFloat newOffset = currentOffset - 10;
    [menuScrollView setContentOffset:CGPointMake(newOffset,0.0) animated:YES];
}

Note: this is from the top of my head, so I don't guarantee that it will work.

Answer 2

bump.. I have the same issue..Anyone pleaseee