UITableViewController add item via method

Question

I am using a UISplitviewController and I am trying to add items to the table view.

right now I have two ways

1. Create a button and add it:

   UIBarButtonItem *addButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(insertNewObject:)];
   self.navigationItem.rightBarButtonItem = addButton;
   

and this code runs when the button is clicked:

- (void)insertNewObject:(id)sender {
    if (!self.objects) {
        self.objects = [[NSMutableArray alloc] init];
    }
    [self.objects insertObject:[NSDate date] atIndex:0];
    NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
    [self.tableView insertRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
}

and adds an item to the table view:

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

    NSString *object = self.objects[indexPath.row];
    cell.textLabel.text = [object description];
    return cell;
}

this way works.

This is what I am trying to do:

- (void)GetRequest
{

    if (!self.objects) {
        self.objects = [[NSMutableArray alloc] init];
    }
    [self.objects insertObject:[NSDate date] atIndex:0];
    NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
    [self.tableView insertRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];

}

but this does not update the table view. I added a breakpoint and when I use the button I added, it goes into the table view, with the method it does not and I am calling the method via [MasterController GetRequest];

What am I doing wrong ?

I am calling GetRequest from another controller.

This is how MasterController is getting defined:

@interface DetailController ()
{

    MasterController *MasterController;

}

DetailController.m:

#import "MasterController.h"

@interface DetailController ()
{
     MasterController *MasterController;
}

@end

@implementation DetailController

-(void)viewDidLoad {
     MasterController = [[MasterController alloc]init];
}

[MasterController GetRequest];

MasterController.m:

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

    NSString *object = self.objects[indexPath.row];
    cell.textLabel.text = [object description];
    return cell;
}

- (void)GetRequest
{

    if (!self.objects) {
        self.objects = [[NSMutableArray alloc] init];
    }
    [self.objects insertObject:[NSDate date] atIndex:0];
    [self.tableView reloadData];

}

Answer 1

As I suspected, with this line, MasterController = [[MasterController alloc]init], you're creating a new instance that has nothing to do with the one you see on screen. You need to get a reference to the master controller that you already have in the split view controller. From the detail view controller, you can get that like so,

MasterController = self.splitViewController.viewControllers.firstObject;

The split view controller has a viewControllers property, and the one at index 0 is the master, and the one at index 1 is the detail. BTW, you should start your ivars and method names with a lower class letter.