How to reuse view on UIScrollView - iphone

Question

Am having three UIViews(320*568). I want to reuse them on scrollView. Like we do with UItable cells.
AM Having UIscrollView of width 320X10. i.e, it can show 10 views. But I want to use only 3 views. Here's my code, But It Doesnt work well when I scroll too fast. PLease Help.
I added the same code in the - (void)scrollViewDidScroll:(UIScrollView *)sender
It works Properly then. But It Prints NSLog("hello"); about 10-15 times, when I scroll just one page.
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(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
NSlog("hello");
int pageCurrently = scrollView.contentOffset.x / scrollView.frame.size.width;
if (scrollView.contentOffset.x < 320)
{
a=0;
b=320;
c=640;
}
else if (scrollView.contentOffset.x >= 320)
{
if(scrollView.contentOffset.x == 320)
{
a=0;
b=320;
c=640;
}
else if(toCheckScrollNumber == pageCurrently )
{
}
else if(pageCurrently > intPreviousPage)
{
largeVal=MAX(c, MAX(a, b));
smallVal=MIN(c, MIN(a, b));
if(smallVal==a)
{
a = largeVal + 320;
}
else if(smallVal==b)
{
b = largeVal + 320;
}
else if (smallVal==c)
{
c = largeVal + 320;
}
}
else if(pageCurrently < intPreviousPage)
{
largeVal=MAX(c, MAX(a, b));
smallVal=MIN(c, MIN(a, b));
if(largeVal==a)
{
a = smallVal - 320;
}
else if(largeVal==b)
{
b = smallVal - 320;
}
else if (largeVal==c)
{
c = smallVal - 320;
}
}
}
NSLog(#"a=%d , b=%d , c=%d ",a,b,c);
[_otlSubView1 setFrame:CGRectMake(a, 0, 320, 568)];
[_otlSubView2 setFrame:CGRectMake(b, 0, 320, 568)];
[_otlSubView3 setFrame:CGRectMake(c, 0, 320, 568)];
intPreviousPage=pageCurrently;
}

Answer 1

You should use the scrollViewDidScroll function to do your view reuse, not didEndDecelerating - the latter is only called when the scroll view already slows down.
As your views are quite small (10 pixels high), it might also be that you have to add some views more in advance (eg not only one view that is to become visible, but maybe already 3 in advance - the UITableView also does preload a few lines more.