UIScrollView Infinite Scrolling

Question

I\'m attempting to setup a scrollview with infinite (horizontal) scrolling.

Scrolling forward is easy - I have implemented scrollViewDidScroll, and when the contentO

Answer 1

(hope I'm posting this correctly - I'm new here!?)

mvds was spot on - thanks - subclassing UIScrollView works perfectly - I'm yet to implement the shifting and loading of new data, but I have a UIScrollView that scrolls round in an endless loop!

Heres the code:

#import "BRScrollView.h"

@implementation BRScrollView

- (id)awakeFromNib:(NSCoder *)decoder {
    offsetAdjustment = 0;
    [super initWithCoder:decoder];
    return self;
}

- (void)setContentOffset:(CGPoint)contentOffset {

    float realOffset = contentOffset.x + offsetAdjustment;

    //This happens when contentOffset has updated correctly - there is no need for the adjustment any more
    if (realOffset < expectedContentOffset-2000 || realOffset > expectedContentOffset+2000) {
        offsetAdjustment = 0;
        realOffset = contentOffset.x;
    }

    float pageNumber = realOffset / 320;
    float pageCount = self.contentSize.width / 320;

    if (pageNumber > pageCount-4) {
        offsetAdjustment -= 3200;
        realOffset -= 3200;
    }

    if (pageNumber < 4) {
        offsetAdjustment += 3200;
        realOffset += 3200; 
    }

    //Save expected offset for next call, and pass the real offset on
    expectedContentOffset = realOffset;     
    [super setContentOffset:CGPointMake(realOffset, 0)];


}

- (void)dealloc {
    [super dealloc];
}


@end

Notes:

If you actually want an infinite loop, you'd need to adjust the numbers - this codes notices when you get near the edge and moves you to just beyond the middle

My contentSize is 6720 (21 pages)

I'm only interest in scrolling horizontally, so only save the x values and hard code the y to 0!

Ben