Question

I was using an NSArray for display of data in my DetailViewController. Now I have changed it to a NSMutableArray, and it crashes when it reach viewWillAppear when I push to the DetailViewController. What can cause this?

Sent from viewController to DetailViewController:

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {


if ([[segue identifier] isEqualToString:@"DetailSegue"]) {

    NSIndexPath *selectedRowIndex = [self.tableView indexPathForSelectedRow];
    WinesDetailViewController *winesdetailViewController = [segue destinationViewController];

    winesdetailViewController.detailsDataSource = [[NSMutableArray alloc] initWithObjects:sortedWines,nil];
    winesdetailViewController.detailIndex = selectedRowIndex.row;
}

}

Recieved:

@property (strong, nonatomic) NSMutableArray *detailsDataSource;
@property int detailIndex;

viewWillAppear:

if ([[[detailsDataSource objectAtIndex: detailIndex] valueForKey:@"Rate"] isEqual:[NSNumber numberWithInt:1]])  {

    ratingImageView.image = [UIImage imageNamed:@"[e-mail]"];
}

flagImageView.image = [UIImage imageNamed:[[detailsDataSource objectAtIndex: detailIndex] valueForKey:@"Flag"]];

This is part of what is displayed in log:

-[__NSArrayI isEqualToString:]: unrecognized selector sent to instance 0x6d2ee20
2012-08-15 00:00:16.860 Rødvinsguiden test[4240:f803] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSArrayI isEqualToString:]: unrecognized selector sent to instance 0x6d2ee20'

Answer 1

winesdetailViewController.detailsDataSource is a NSMutableArray containing a NSArray. I’m guessing previously your array contained a number of strings and that you actually want to create it using:

winesdetailViewController.detailsDataSource = [[NSMutableArray alloc] initWithArray:sortedWines];