iOS UIScrollview + UIimageviews memory crash

[igorladessa]

I need to scroll over 200 images. I ahve found a tutorial that says that I can over 1000 images with the tutorial code. The tutorial is:

http://soulwithmobiletechnology.blogspot.com.br/2011/05/how-to-load-1000s-of-uiimageview-on.html?m=1

I followed the tutorial, but when I use 100 images aprox..the app crash with memory warning.

My code is here:

http://pastebin.com/BKmsdXxf

I have already with UIIMagenamed, with initWithContentsOfFile

but the problem persist. Pls , help me!

 

[Ides]

Well how big are the images you're loading? If they are very large then they will cause memory warnings, if you're loading 100+.

 

[igorladessa]

Well how big are the images you're loading? If they are very large then they will cause memory warnings, if you're loading 100+.

1,5 mb

 

[PhoneyDeveloper]

Use a tableview if you can. Otherwise set things up so that only a small number of image views exist at a time. Unload the image views when they scroll off.

 

[dejo]

1,5 mb

Those are quite large. You might want to consider creating thumbnail versions for display most of the time.

Use a tableview if you can. Otherwise set things up so that only a small number of image views exist at a time. Unload the image views when they scroll off.

Yeah, UICollectionView (iOS 6) might be a good solution, if UITableView is not, because it works similar in that cells are reused.

 

[igorladessa]

solved!!

I release all ImageViews and load the current and next imageView, when scrolling!

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
CGPoint scrollOffset=scrollView.contentOffset;
int pagAtual = scrollOffset.x/scroll.frame.size.width;
if(pagAtual != 0) { //always release all imageViews and load the current and next
for(int iCnt = 0; iCnt < [scroll.subviews count]; iCnt++) {
    UIView *viewLiberar = [scroll.subviews objectAtIndex:iCnt];
 if ([viewLiberar isKindOfClass:UIImageView.class]) {
    [viewLiberar removeFromSuperview];
     viewLiberar = nil;
   }
 }
}

if(pageOnScrollView < ((int)scrollOffset.x/scroll.frame.size.width))
 { 

 //load the next page
[self loadNextPage:(pagAtual)];
[self loadNextPage:(pagAtual + 1)];
 }
else if(pageOnScrollView > ((int)scrollOffset.x/scroll.frame.size.width))
  {
  if(pagAtual>0)[self loadNextPage:((int)scrollOffset.x/scroll.frame.size.width)-1];
    }

     pageOnScrollView=scrollOffset.x/scroll.frame.size.width;
      }

It works!