自定义TableViewCell不显示标签

Question

I'm struggling with a problem I encountered while trying to create a custom UITableViewCell.

I subclassed UITableViewCell in SGTableViewCell and added it in the prototype cell in the storyboard.

As you can see the label is connected

and the cell identifier is set correctly

Then I linked the label to the SGTableViewCell.h like this

@property (strong, nonatomic) IBOutlet UILabel *nameLabel;

and in the .m file I have this code

- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
    if (self) {
        self.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
        [self addGestureRecognizer:recognizer];

        self.nameLabel = [[UILabel alloc] init];
        _checkView = [[UIView alloc] initWithFrame:CGRectNull];
        _checkView.backgroundColor = kGreen;
        _checkView.alpha = 0.0;
        [self addSubview:_checkView];
        self.nameLabel.text = @"Hello";
        }
    return self;
 }

But when I use this cell in my tableview using this code

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    Episode *episode = [self.selectedSeason.episodeList objectAtIndex:indexPath.row];

    SGTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Episode"];

    UIView *selectionColor = [[UIView alloc] init];
    selectionColor.backgroundColor = kSelectionGrey;

    cell.selectedBackgroundView = selectionColor;
    cell.backgroundColor = kBackgroundGrey;

    cell.nameLabel.text = episode.name;
    NSLog(@"%@", cell.nameLabel.text);
    cell.nameLabel.textColor = [UIColor redColor];

    return cell;
}

I get no text at all.

I tried logging the text from each label in each cell and it gives me the right text. I tried setting programmatically a different disclosure indicator for the custom cell and it did change so everything is allocated and working but label is not displaying. I honestly have no idea of what's the problem. Did I miss something? Thank you

PARTIALLY SOLVED:

OK i tried doing the same thing on an empty project and everything worked flawlessly so I checked again my project and found this line

[self.tableView registerClass:[SGTableViewCell class] forCellReuseIdentifier:@"Episode"];

Seeing it was not necessary for the empty project i commented this line and everything started working.

The only problem i have now is that if i don't use this line i can't use the custom cell as was intended. In fact my custom cell is swipable using a pan gesture recognizer but without registering my custom class to the tableview seems like the swipe doesn't work.

Sorry for the trouble, seems like i messed up again :/

Answer 1

You shouldn't alloc init a label that you created in the storyboard, it is already allocated automatically. When you do self.nameLabel = [[UILabel alloc] init]; , you reset the self.nameLabel property to point to a new empty memory location and not to the label created in the storyboard, hence you can change its text property and see the result in NSLog but not in the storyboard because it doesn't refer to that label in the storyboard.

Try removing all initialisation from the initWithStyle method (to make sure nothing is covering it such as that subview you create), and everything related to the label in the cellForRowAtIndexPath method (same reason), and try a simple assignment like self.nameLabel.text = @"Test text" in the cellForRowAtIndexPath method, it should work. Then add all your other initialisation.

And yeah, don't forget to input your cell reuse identifier "Episode" in the storyboard.

Answer 2

Make sure you:

1. Have linked the delegate and the datasource to the view the tablview is housed in.

2. Have that view implement UITableViewController and UITableViewDelegate (I'm pretty sure it is both of those).

3. Implement the necessary methods, which you seem to have done. You need the row size, section size, and the add cell methods

4. After updating the array linked to your tableview, call [ tableView reloadData ]

Have a look at this link: Tutorial to create a simple tableview app