Question

I’ve got an array populating a small tableView in a DetailView class, and when the user presses a button I need the array to be sent to another View Controller, to populate a tableView there, but I’m having some difficulty getting it working. This is what I’ve been trying to do so far:

*DetailViewController.m*

    #import "DetailViewController.h"
    #import "OtherViewController.h"


-(IBAction) toCart:(id)sender {

    OtherViewController *oVC = [[OtherViewController alloc] init];
    oVC.shoppingList = sList;
    NSLog(@"Ingredients count %d", [sList count]); //This returns a number, so the sList definitely contains values, and the method is definitely being called.
    [oVC release];

}

---

*OtherViewController.m*

    #import "OtherViewController.h"
    #import "DetailViewController.h"

    @synthesize shoppingList;

-(void) viewWillAppear: (BOOL)animated {
    NSLog(@"list count: %d", [shoppingList count]); // This returns 0

}

sList is populated elsewhere in the class, and sList and shoppingList are both declared in their respective .h files, with @property (nonatomic, retain)…

Any help much appreciated!

Answer 1

As you are having taBbarcontroller, so you can proceed as follows :

Create references of your you viewControllers(which are associated with tabbar as topViewController) in your appDelegate.

otherViewController = [[tabBarController.viewControllers objectAtIndex:<tabIndex>] topViewController];

make it as @property in appDelegate so that you can access it anywhere in your app.

now,

-(IBAction) toCart:(id)sender {

    //appDelegate <--- get reference to your application delegate using [[UIApplication sharedApplicaiton]delegate] do not forget to properly type cast it.

    OtherViewController *oVC = [appDelegate otherViewController];
    oVC.shoppingList = sList;
    NSLog(@"Ingredients count %d", [sList count]); 
//This returns a number, so the sList definitely contains values, and the method is definitely being called.
   // [oVC release]; no need to release it...

}


//also make sure you do not initialize shoppingList of otherViewController in viewDidLoad(or any other method) of otherViewController, else it will be overwritten(lost its previous reference).

in your appDelegate's .h write

@property OtherViewController *otherViewController;

in appDelegate's.m

@synthesize otherViewController;

in appDelegates‘s .m (method didFinishLaunchingWithOptions: ) write

otherViewController = [[tabBarController.viewControllers objectAtIndex:<tabIndex>] topViewController];

Thanks