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@dhoerl dhoerl/README.txt
Created Jan 28, 2012

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UITableViewCells from a NIB - better than Apple's iOS 5 code
Reloading the NIB is expensive. Better to load it once, then instantiate the objects when you need a cell. Note that you can add UIImageViews etc to the nib, even multiple cells, using this method (Apple's "registerNIB" iOS5 allows only one top level object - one UITableViewCell. Bug 10580062 "iOS5 tableView registerNib: overly restrictive"
So my code is below - you read in the NIB once (in +initialize like I did or in viewDidload - whatever. From then on, you instantiate the nib into objects then pick the one you need. This is much more efficient than loading the nib over and over.
#if ! __has_feature(objc_arc)
#error THIS CODE MUST BE COMPILED WITH ARC ENABLED!
#endif
static UINib *cellNib;
+ (void)initialize
{
if(self == [ImageManager class]) {
cellNib = [UINib nibWithNibName:@"ImageManagerCell" bundle:nil];
assert(cellNib);
}
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *cellID = @"TheCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellID];
if(cell == nil) {
NSArray *topLevelItems = [cellNib instantiateWithOwner:nil options:nil];
NSUInteger idx = [topLevelItems indexOfObjectPassingTest:^BOOL(id obj, NSUInteger idx, BOOL *stop)
{
UITableViewCell *cell = (UITableViewCell *)obj;
return [cell isKindOfClass:[UITableViewCell class]] && [cell.reuseIdentifier isEqualToString:cellID];
} ];
assert(idx != NSNotFound);
cell = [topLevelItems objectAtIndex:idx];
}
cell.textLabel.text = [NSString stringWithFormat:@"Howdie %d", indexPath.row];
return cell;
}
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