Change tab and push view from AppDelegate

Question

I have a method called handleLocalNotification in my AppDelegate that fires when my app gets a notification. I need it to switch to tab 0 in my UITabBarController which contains a UITableview. I then need it to push on the correct row of the tableview to show the record sent by the notification. All Controllers are created in the storyboard, so I have no references to them in the AppDelegate.

I've added to my AppDelegate.h:

@class MyListViewController;
@interface iS2MAppDelegate : UIResponder <UIApplicationDelegate> {

    MyListViewController *_listControl;

}

and for testing I'm just putting this in the didFinishLaunchingWithOptions method:

UITabBarController *tabb = (UITabBarController *)self.window.rootViewController;
    tabb.selectedIndex = 0;
    _listControl = [tabb.viewControllers objectAtIndex:0];
    [_listControl.tableView selectRowAtIndexPath:[NSIndexPath indexPathForRow:4 inSection:0] animated:YES scrollPosition:UITableViewScrollPositionTop];

The tabBarController bit works as I can get it to load up on different tabs. The last 2 lines cause it to crash. Have I gone about this the correct way? Or do I need to use a different method? The crash reason is:

UINavigationController tableView]: unrecognized selector sent to instance

Answer 1

i suggest to use NSNotificationCenter try to do it like this

- (void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification
{
  UITabBarController *tabb = (UITabBarController *)self.window.rootViewController;
  tabb.selectedIndex = 0;
 [[NSNotificationCenter defaultCenter] postNotificationName:@"localNotificationReceived" object:nil];
}

and in your viewController viewDidLoad :

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(selectRows) name:@"localNotificationReceived" object:nil];

now you can use your tableView and do your stuff

-(void) selectRows
{
    [tableView selectRowAtIndexPath:[NSIndexPath indexPathForRow:4 inSection:0] animated:YES scrollPosition:UITableViewScrollPositionTop];
}

To programmatically select a cell , this may do the job :

NSIndexPath *selectedCellIndexPath = [NSIndexPath indexPathForRow:4 inSection:0];
[table selectRowAtIndexPath:selectedCellIndexPath 
                   animated:YES 
             scrollPosition:UITableViewScrollPositionTop];
[table.delegate tableView:table didSelectRowAtIndexPath:selectedCellIndexPath];

because selectRowAtIndexPath will not fire the table delegate methods so you have to call with your self.