objective c - Moving back from a Controller to a previous one

Question

I'm trying to switch back from my UIViewController to my UITableViewController but apperendly it's not working the way I want it to. I did create my Interface with storyboards from the start, so I'm not really into moving from one View to another by code. Until now, I just pushed my Views per sergues which are easy to implement with storyboards. But when I tried moving back to my previous Views, a new ViewController will be implemented, so all my data I stored in the old one is "lost".

Actually there is no code I could present you (because of the sergues) but the situation is:

->I got an MutableArray storing stuff in my UITableView.

->User taps the scan Button, scans a new Item which should be imported in my array.

->When trying to push back to my tableView there's a new Controller awating me, unaware of the data I stored in the old one.

So how do I simply move back to my old Controller preventing to create a new one all the time?

Does a sergue-push always creates a new Controller?

(Question may be simple, but I'm new to this stuff. Tried some results presented by the search function, but none of them worked :( )

/edit: Popback problem has been solved but array filling problem still exists. Code:

GeneralSettings *sharedGS = [GeneralSettings sharedInstance];
sharedGS.strEAN = [[NSString alloc] initWithString:strCheckString];
[sharedGS.listArray insertObject:strCheckString atIndex:0];
NSLog(@"Anzahl der EAN-Codes: %d
Erster Code: %@
 In Variable: %@", sharedGS.listArray.count, [sharedGS.listArray objectAtIndex:0],sharedGS.strEAN);

Data in sharedGS.strEAN ("83274572354" i.e.) Data in listArray (null)

Answer 1

You don't push back. That creates a new instance of the previous controller class. You pop back. You can accomplish that 2 ways.

1: In code put in the following statement when you want to return (pop) to you tablet view controller.

[self.navigationController popViewControllerAnimated:YES];

2: If you want to do it in storyboard you need to implement the following custom segue class:

implementation

//  PopSegue.m

#import "PopSegue.h"

@implementation PopSegue

- (void) perform {

    UIViewController *src = (UIViewController *) self.sourceViewController;
[src.navigationController popViewControllerAnimated:YES];
}

and header

//  PopSegue.h

#import <UIKit/UIKit.h>

@interface PopSegue : UIStoryboardSegue

@end

Place this method in your UIViewController to set a property back to your UITableViewController:

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([[segue identifier] isEqualToString:@"goBackToTableView"])  {
    [[segue destinationViewController] set{whatEverProperyYouWantTo}: {valueOfPropertyToSet}];
    }
}