UIScrollView with pages from buffer

[kenshin]

Hello, everyone.

I work under PDFViewer project and need some advice.

so, i load PDF pages in buffer (max 8), then displays its in ScrollView. And now i need implement one thing that adds pages in buffer (if (pagesInBuffer - currentPage < step)) and delete pages from begining of array, if they are't needed. I implemented tihs in my project, but not all working right.

This is the code :

if(currentPoint.x == screenWidth){
		currentPage += 1;
		screenWidth += 768;
		[self loadScrollViewWithPage:currentPage];
		
		if(realLastPage - currentPage <= step){
			
			for(int i = 0; i < step; i++){
				[myPage loadViewForPage:page cycles:realLastPage + i append:YES filename:filename array:pageArray];

				NSLog(@"size of pageArray after adding elements: %d", [pageArray count]);
				
				[pageArray removeObjectsInRange:NSMakeRange(0, step)];
				NSLog(@"size of pageArray after deleting elements: %d", [pageArray count]);
			}
			realFirstPage += step;
		}
	}
	
	NSLog(@"currentPage: %d", currentPage);

what they are doing :
1. load page with page number.
2. if laspage - currentpage < step load 'step' pages in buffer array.
3. deleting first 2 pages from array.
4. incement out firstpage for displaying right view.

What i forgot to implement. What are not correct.
Maybe i must make scroll.content size bigger?

P.S. thanks
P.S. and sorry, if in text you found gramatic mistakes.

[kenshin]

really, no ideas?

[kenshin]

all of upper code are in :

 - (void) scrollViewDidScroll:(UIScrollView*) sender

maybe code has wrong location? maybe something else? Really need help with this.

[kenshin]

maybe this help, i have also methods:

- (void)layoutScrollImages
{
	UIImageView *view = nil;
	NSArray *subviews = [scroller subviews];
	
	// reposition all image subviews in a horizontal serial fashion
	CGFloat curXLocation = 0;
	for (view in subviews)
	{
		if ([view isKindOfClass:[UIImageView class]] && view.tag > 0)
		{
			CGRect frame = view.frame;
			frame.origin = CGPointMake(curXLocation, 0);
			view.frame = frame;
			
			curXLocation += (kScrollObjWidth);
			//NSLog(@"pages X loc: %f", curXLocation);
		} 
	}
	
	[scroller setContentSize:CGSizeMake(((pagesInBuffer - 1) * kScrollObjWidth), [scroller bounds].size.height)];
	
}

//load images to our scrollview
- (void) loadScrollViewWithPage:(int) page{
	
	NSAutoreleasePool *aPool = [[NSAutoreleasePool alloc] init];
	
	UIImage *image = [pageArray objectAtIndex:page];
	imageView = [[UIImageView alloc] initWithImage:image];
		
	CGRect rect = imageView.frame;
	rect.size.height = kScrollObjHeight;
	rect.size.width = kScrollObjWidth;
	imageView.frame = rect;
	imageView.tag = page;
	imageView.transform = CGAffineTransformMakeScale(1, -1);
	[scroller addSubview:imageView];
	[imageView release];

	[self performSelectorOnMainThread:@selector(backgroundLoadFinished) withObject:nil waitUntilDone:NO];
	[aPool release];
}

[kenshin]

really no one can't help with this?