how do i scroll through 100 photos in UIScrollView in IPhone
- by mwangima
I'm trying to scroll through images being downloaded from a users online album (like in the facebook iphone app) since i can't load all images into memory, i'm loading 3 at a time (prev,current & next). then removing image(prev-1) & image (next +1) from the uiscroller subviews.
my logic works fine in the simulator but fails in the device with this error:
[CALayer retain]: message sent to deallocated instance
what could be the problem
below is my code sample
- (void)scrollViewDidEndDecelerating:(UIScrollView *)_scrollView
{
pageControlIsChangingPage = NO;
CGFloat pageWidth = _scrollView.frame.size.width;
int page = floor((_scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
if (page1 && page<=(pageControl.numberOfPages-3)) {
[self removeThisView:(page-2)];
[self removeThisView:(page+2)];
}
if(page0)
{
NSLog(@"<< PREVIOUS");
[self showPhoto:(page-1)];
}
[self showPhoto:page];
if(page<(pageControl.numberOfPages-1))
{
//NSLog(@"NEXT ");
[self showPhoto:page+1];
NSLog(@"FINISHED LOADING NEXT ");
}
}
-(void) showPhoto:(NSInteger)index
{
CGFloat cx = scrollView.frame.size.width*index;
CGFloat cy = 40;
CGRect rect=CGRectMake( 0, 0,320, 480);
rect.origin.x = cx;
rect.origin.y = cy;
AsyncImageView* asyncImage = [[AsyncImageView alloc] initWithFrame:rect];
asyncImage.tag = 999;
NSURL *url = [NSURL URLWithString:[pics objectAtIndex:index]];
[asyncImage loadImageFromURL:url place:CGRectMake(150, 190, 30, 30) member:memberid isSlide:@"Yes" picId:[picsIds objectAtIndex:index]];
[scrollView addSubview:asyncImage];
[asyncImage release];
}
-(void) removeThisView:(NSInteger)index
{
if(index<[[scrollView subviews] count] && [[scrollView subviews] objectAtIndex:index]!=nil){
if ([[[scrollView subviews] objectAtIndex:index] isKindOfClass:[AsyncImageView class]] || [[[scrollView subviews] objectAtIndex:index] isKindOfClass:[UIImageView class]]) {
[[[scrollView subviews] objectAtIndex:index] removeFromSuperview];
}
}
}
For the record it works OK in the simulator, but not the iphone device itself.
any ideas will be appreciated.
cheers,
fred.
