Unable to populate UITableView from NSMutable array from another view

Question

I have 2 VCs, first is BooksDetailViewController which has the NSString myBookString. Another on is FavBooksViewController which has the favBookList NSMutableArray. I want to pass the NSString myBookString from the 1st VC to include it in the favBookList NSMutableArray which then populates the table.

I have included @class FavBooksViewController; in the BooksDetailViewController.h

Imported #import "FavBooksViewController.h" in the BooksDetailViewController.m

The action in the BooksDetailViewController.m looks like this:

- (IBAction)addToFav:(id)sender {
    FavBooksViewController *mdvc;
    [mdvc.self.favBookList addObject:myBookString];
}

In FavBooksViewController.h I have

@interface FavBooksViewController : UIViewController <UITableViewDataSource, UITableViewDelegate>

@property (strong, nonatomic) id delegate;
@property (nonatomic,strong) NSMutableArray *favBookList;

In the FavBooksViewController.m - #import "FavBooksDetailViewController.h" In the ViewDidLoad I tried to include this line

self.favBookList = [[NSMutableArray alloc]initWithObjects:nil];

But I have commented it out. With it our without it the UITableView isn't working. And of course I have this:

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [self.favBookList count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView 
         cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{
           UITableViewCell *cell = [tableView 
                                 dequeueReusableCellWithIdentifier:@"favBooksCell"];

        cell.textLabel.text = [self.favBookList
                               objectAtIndex:indexPath.row];
        return cell;
}

No matter what, the UITableView is just empty, no cells, nothing. What can be the possible mistake here? What am I doing wrong? Thanks in advance!

Hey SergiusGee, just to be sure. have you linked your tableView with the delegate/datasource? It happens to me sometimes :-) — iGranDav
– iGranDav, Commented Jul 27, 2012 at 8:33

Nayan Chauhan · Accepted Answer · 2012-07-27 08:54:52Z

2

Instead of adding the string to the array in the BooksDetailViewController , just pass the string to the FavBooksViewController and then add it to the array in your FavBooksViewController.

- (IBAction)addToFav:(id)sender {
    FavBooksViewController *mdvc;
    [mdvc setFavBook:myBookString];  
    //favBook is a NSString member object in your FavBooksViewController class

     [self.navigationController pushViewController:mdvc animated:YES];
}

Just try if this works.

answered Jul 27, 2012 at 8:54

Nayan Chauhan

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Comments

iGranDav · Accepted Answer · 2012-07-27 08:36:53Z

2

You forgot to initiates the cell in your cellForRowAtIndexPath method.

The code should be :

- (UITableViewCell *)tableView:(UITableView *)tableView 
         cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{
        static NSString *identifier = @"favBooksCell";

        UITableViewCell *cell = [tableView 
                                 dequeueReusableCellWithIdentifier:identifier];
        if(!cell) {
            cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier];
        }

        cell.textLabel.text = [self.favBookList
                               objectAtIndex:indexPath.row];
        return cell;
}

Try this ;-)

Hope this helps.

answered Jul 27, 2012 at 8:36

iGranDav

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2 Comments

iGranDav Over a year ago

You have to do this, but it seems that your array is still empty. Try to remove self in your addToFav method. You now should have [mdvc.favBookList addObject:myBookString];

Joshua Lückers Over a year ago

It's the first thing I asked. Are you sure the object is added to the NSMutableArray?

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