NBInfiniteScroller

Expands on the Apple sample StreetScroller to give you both horizontal and vertical "infinite" or "looping" scrolling over a set of UIViews.

I was looking for a circular/infinite scroller with memory behavior closer to UITableView (only holding on to views that were visible or recently visible). Most examples I found were loopers with a single item visible at once and without good memory behavior. Apple's StreetScroller example had the visual and memory behaviors I wanted but only worked horizontally and didn't keep track of items in a way that would easily allow you to map them to items in an array or elsewhere back in your application. I added in vertical scrolling and a block/callback to return views to the scroller based on their index within the count of items you tell it are in the list.

##Examples of use This test project gives an example of a vertical and a horizontal infinite/looper scroller.

  // will default based on the height/width of the view (vertical if height > width), but you can override it
  scrollViewLeft.vertical = YES;

  // the number of items to loop over, 0..N-1
  scrollViewLeft.count = 40;

  // the views are by default centered in the NBInfiniteScroller's view with no padding
  scrollViewLeft.padding = UIEdgeInsetsMake(5, 5, 5, 5);

  // provide a block to return UIView's as needed when they come into view
  // if you don't provide a block, a simple label with the index will be provided (useful just for debugging)
  scrollViewLeft.viewForIndex = ^(NSUInteger index){
    UIView *inner = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 50, 50)];
    inner.layer.cornerRadius = 10.0;
    inner.backgroundColor = [colors objectAtIndex:arc4random() % [colors count]];
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 50, 50)];
    label.textAlignment = UITextAlignmentCenter;
    label.backgroundColor = [UIColor clearColor];
    label.text = [NSString stringWithFormat:@"%d", index];
    [inner addSubview:label];
    return inner;
  };

##Installation Simply copy NBInfiniteScrollView.h and NBInfiniteScrollView.m into your project and use them as you would a UIScrollView. See the example above from the sample NBInfiniteScrollerViewController.