Trying to render a large columnar grid within a UITableView - ios

Question

I have created a sort of GRID using uitableView. For that I have taken various labels for showing grid type line I am using line image. So by considering Grid my tableview is having around 88 columns.
My issue is when I scroll it down, I am getting jerky effect. Its performance s very poor. I am creating around 108 label and each row is having 88 labels and 86 image views.
What step do I need to follow to improve scrolling performance???
I was using clearColor for label background. But later on I have removed those background colors.

Answer 1

Having read your problem again, I am thinking you are scrolling horizontally and vertically with an incredibly wide tableview. If this is the case then you need to switch to UIScrollView and attach each item to this view. UIScrollView will only load the views that are visible and provide the kind of scroll performance you desire.
It will be important to avoid this:
// Using ARC, therefore no release on the UILabel
- (void) viewDidLoad {
self.scrollView.backgroundColor = [UIColor whiteColor];
UIFont *font = [UIFont systemFontOfSize:24];
CGSize size = [#"10000:10000" sizeWithFont:font];
_scrollView.contentSize = CGSizeMake(10000 * size.width, 10000 * size.height);
for (int y = 0; y < 10000; y++) {
for (int x = 0; x < 10000; x++) {
NSLog(#"Loading: %d, %d", x, y);
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(x * size.width, y * size.height, size.width, size.height)];
label.font = font;
label.textAlignment = UITextAlignmentRight;
label.text = [NSString stringWithFormat:#"%d:%d", x, y];
[_scrollView addSubview:label];
}
}
}
While this will eventually load it will take ages while it loads up all of these labels and it will consume a ton of memory. You want to lazy load this view just like a TableView. I will write up an example this evening.

Answer 2

You need to give the table cell a reuse identifier. Otherwise, each time you create a completely new cell and consume more and more memory.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *const kReuseIdentifer = #"ReuseIdentifer";
UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:identifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:kReuseIdentifier] autorelease];
}
return cell;
}