Question

I have two views with navigation controller: first view, there are empty text fields while the second view is a table view where the user can select a row. At the touch of a row there is an action that sets a value to a text field of the first view. Unfortunately when I go back to the first view field is not set.

This is my code:

FirtViewController.h

      @interface FirstViewController : UIViewController 
      {
          UITextField *firstField;
          UITextField *secondField;
      }
      @property(nonatomic, retain) IBOutlet UITextField *firstField;
      @property(nonatomic, retain) IBOutlet UITextField *secondField;
      @property(copy) NSString *selectedRow;
      -(IBAction)showTable:(id)sender

FirstViewController.m

      #import "FirstViewController.h"
      #import "AppDelegate.h"
      #import "SecondViewController.h"

      @implementation FirstViewController
      @synthesize  .....
      .............


      -(void)viewDidAppear:(BOOL)animated 
      {
        [super viewDidAppear:animated];
        self.firstField.text = selectedRow;
      }

      -(IBAction)showTable:(id)sender
      {
         SecondViewController *controllerSecond = [[SecondViewController alloc]  initWithNibName:@"SecondViewController" bundle:nil];
         [self.navigationController pushViewController:controllerSecond animated:YES];
      }

SecondViewController.h

      @class FirstViewController;

      @interface ListaViewController : UIViewController 
      <UITableViewDataSource, UITableViewDelegate, UISearchBarDelegate>
      {
         UITableView *table;
         UISearchBar *search;
         FirstViewController *controller;
      }
      @property (nonatomic, retain) FirstViewController *controller;

SeconViewController.m

      - (void)tableView:(UITableView *)tableView 
         didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

            NSString *selectedRow = [tableData objectAtIndex:indexPath.row];

            controller.selectedRow = selectedRow;
            [self.navigationController popViewControllerAnimated:YES];
      }

Answer 1

What you need to use is delegate. It is very commonly used pattern in Object-C. Check out my answer to this SO post. Let me know if you still need code after.