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!

Answer 1

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.