Table View with Images, slow load and scroll

Question

I tried impletmenting about 30 tutorials today and just cant get anything to work.

My problem is that i load my information via a JSON file, add the data to a NSMuta

Answer 1

You kinda left your problem wide open b/c you weren't specific enough. Performance issues can be related to a bunch of things. Here are a few performance things with tableview cells & images

• Load images on a background thread.

• Reuse cells - don't allocate any more than you need on screen

static NSString *CellIdentifier = @"Cell";

    CellClass *cell = (CellClass*)[tv dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) cell = [[[CellClass alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];

• Only draw images that are the same size of the cell (ie. if a cell is 44 px high, keep UIimages at 44px). If images are bigger, you might have to process the images after downloading them from the internet.

• Don't use uiimageview in your cell. instead create a custom cell (ie. subclass) and draw the image in your drawRect: function.