在表视图控制器到详细视图控制器之间传递数据时出错

Question

I am getting an error while passing data from a table view controller to a detail view controller. I am using a navigation controller along with it.

The error message is as follows:

use of undeclared identifier _wordLabel

This is the prepare for segue implementation in my table view controller (.m file).

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    if ([[segue identifier] isEqualToString:@"ShowWordDetails"]) {

        //UINavigationController *navController = (UINavigationController *)segue.destinationViewController;
        wordDetailViewController *detailViewController = [segue destinationViewController];
        NSIndexPath *myIndexPath = [self.tableView indexPathForSelectedRow];
        long row = [myIndexPath row];
        detailViewController.wordDetailModel = @[_wordLabel[row], _meaningLabel[row]];
    }
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}

I have previously declared wordLabel and meaningLabel in the detail view controller as follows:

@property (strong, nonatomic) IBOutlet UILabel *wordLabel;
@property (strong, nonatomic) IBOutlet UILabel *meaningLabel;
@property (strong, nonatomic) NSArray *wordDetailModel;

I have also declared it in viewDidLoad method of detail view controller as follows:

-(void)viewDidLoad {

    [super viewDidLoad];
    _wordLabel.text = _wordDetailModel[0];
    _meaningLabel.text = _wordDetailModel[1];
        // Do any additional setup after loading the view.
}

Answer 1

_wordLabel is private member of your detailViewController. You can't access it like you're trying to do in the first code quote. You need to call detailViewController.wordLabel instead.

Answer 2

first of all you can't use the array operator with a UILabel

_wordLabel[row]

second of all you have to define the _wordLabel[row] as an array in the TVC, that is separate from the label in the detailViewController

Answer 3

I think you don't require wordDetailModel as you can access UILabel from TableViewController as described below

detailViewController.wordLabel.text = @"Word";
detailViewController.meaningLabel.text = @"Meaning";

_wordLabel is UILabel and it is private variable in DetailViewController which can not be used directly from TableViewController , you have to use it using property . Plus _wordLabel is not an array as already answered by @sha and @rockstarr