CODEWITHSUNDEEP
iosobjective-cuitableview
iOS-programmer
iOS-programmer

Reputation: 1401

UITableViewCell is not reuse properly?

I try to reuse UITableViewCell as follow:
1) Create subclass by UITableViewCell with xib-file.

@interface BaseCell : UITableViewCell
@property (weak, nonatomic) IBOutlet UILabel *labelTitle;
@end

2) Add reuse identifier in IB
enter image description here

3) Add UIViewController with UITableView in it.

@interface BaseTableViewController : UIViewController <UITableViewDataSource, UITableViewDelegate>
@property (weak, nonatomic) IBOutlet UITableView *tableView;
@end

4) in viewDidLoad register cell nib

[self.tableView registerNib:[UINib nibWithNibName:@"BaseCell" bundle:nil] forCellReuseIdentifier:@"BaseCell"];

5) and use dequeueReusableCellWithIdentifier

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    BaseCell* cell = [tableView dequeueReusableCellWithIdentifier:@"BaseCell"];
    NSAssert(cell, @"cell registered but not created");
    DLog(@"cell:[%p]", cell);

    cell.labelTitle.text = self.showItems[indexPath.row];
    return cell;
}

After that I see that cell created every time instead only first time.
My log for example:

[0x7f87c9c84740:1] -[BaseCell initWithCoder:] BaseCell
[0x7f87c9c84740:1] -[BaseCell awakeFromNib] reuseIdentifier:BaseCell;
[0x7f87c9d3d230:1] -[BaseTableViewController tableView:cellForRowAtIndexPath:] cell:[0x7f87c9c84740]
[0x7f87c9e29560:1] -[BaseCell initWithCoder:] BaseCell
[0x7f87c9e29560:1] -[BaseCell awakeFromNib] reuseIdentifier:BaseCell;
[0x7f87c9d3d230:1] -[BaseTableViewController tableView:cellForRowAtIndexPath:] cell:[0x7f87c9e29560]
[0x7f87c9e2d150:1] -[BaseCell initWithCoder:] BaseCell

What I do wrong? How properly reuse cells.
I use latest Xcode (6.0.1)
I created example project to test it.

Upvotes: 0

Views: 730

Answers (1)

pbasdf
pbasdf

Reputation: 21536

The benefits of cell reuse will only become apparent once cells go off-screen when scrolling (or become "unused" for some other reason - e.g. a reloadCells call). The cell that disappears is put into the queue. When the tableView next needs a cell, it uses the one on the queue, rather than constructing a new one from the NIB.

Upvotes: 0

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