Basically there are two ways of passing data to a view controller.
Storyboard
If you are working with storyboard segues (that is, control drag from your "root" view controller to the destination view controller, choose a transition style and define a identifier), you can present the view controller
via
[self performSegueWithIdentifier:@"yourSegueIdentifier" sender:self];
Most of the times your destination view controller will be a custom class, so define a public property to hold the data you want to pass through. Then implement the following in your "root" view controller
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
// Setup the location menu delegate
if([segue.identifier isEqualToString:@"yourSegueIdentifier"]) {
// The custom class of your destination view controller,
// don't forget to import the corresponding header
ViewControllerCustomClass *vc = segue.destinationViewController;
// Set custom property
vc.chosenImageId = self.chosenImageId;
// Send message
[vc message];
}
}
Hints:
If your destination view controller is the root view controller of a navigationViewController you can access it via [[segue.destinationViewController childViewControllers] objectAtIndex:0];
Additionally, as sender
is an id, you can "abuse" it to pass any object through, just as a NSDictionary, for example.
Also note, that when I am referring to the root view controller, I am talking of the view controller from which we segue to the destination from.
Programmatically
ViewControllerCustomClass *vc = [[ViewControllerCustomClass alloc] init];
vc.chosenImageId = self.chosenImageId;
// If you want to push it to the navigation controller
[self.navigationController pushViewController:vc animated:YES];
// If you want to open it modally
[self presentViewController:vc animated:YES completion:nil];