I want to get the value from one class (SearchTableViewController.m) to another class (HistoryTableViewController.m)

#import <UIKit/UIKit.h>
@class SearchDetailViewController;

@interface SearchTableViewController : UITableViewController 
<UISearchBarDelegate, UITableViewDelegate, UITableViewDataSource>{

 IBOutlet UITableView *myTableView;
 NSMutableArray *tableData;//will be storing data that will be displayed in table. //Search array den buna aktarma yapcaz ilerde görceksin.
 NSMutableArray *searchedData;//will be storing data matching with the search string
 UISearchBar *sBar;//search bar

 NSMutableArray *searchArray; // It holds the medicines that 开发者_开发技巧are shown in tableview
 SearchDetailViewController * searchDetailViewController;

 NSMutableArray *deneme;


}

@property(nonatomic,retain)UISearchBar *sBar;
@property(nonatomic,retain)IBOutlet UITableView *myTableView;
@property(nonatomic,retain)NSMutableArray *tableData;
@property(nonatomic,retain)NSMutableArray *searchedData;
@property (nonatomic, retain) NSMutableArray *searchArray;
@property (nonatomic, retain) SearchDetailViewController *searchDetailViewController;


@property (nonatomic, copy) NSMutableArray *deneme;
@end

SearchTableViewController.m

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    // Navigation logic may go here. Create and push another view controller.
 // AnotherViewController *anotherViewController = [[AnotherViewController alloc] initWithNibName:@"AnotherView" bundle:nil];
 // [self.navigationController pushViewController:anotherViewController];
 // [anotherViewController release];


 **deneme= [[NSMutableArray alloc]init];
 deneme=[tableData objectAtIndex:indexPath.row];**

 ****NSLog(@"my row = %@", deneme);**// I holded one of the selected cells here**

HistoryTableViewController.m

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    // Navigation logic may go here. Create and push another view controller.
 // AnotherViewController *anotherViewController = [[AnotherViewController alloc] initWithNibName:@"AnotherView" bundle:nil];
 // [self.navigationController pushViewController:anotherViewController];
 // [anotherViewController release];

 **SearchTableViewController *obj= [[SearchTableViewController alloc]init];**
 **NSLog(@"my 2nd row= %@", [obj deneme]); //it prints nil**


} 

My project is TabBar. There are two buttons on it- Search and History. I want to display selected items in a table in History tab. But i can not bring the selected item from SearchTableViewController.m to the class (HistoryTableViewController.m)

The problem is : I can hold one of the selected items in an array (named deneme)from table in SearchTableViewController.m but i can not take it to HistoryTableViewController.m. It prints nil in console screen.... If I can make it visible in History class, I display those selected items on table. Please help me !!!

Right now in HistoryTableViewController in the didSelectRowAtIndexPath method, it is creating a new instance of SearchTableViewController so the array will be empty. To reference the one in the tab bar, try this:

SearchTableViewController *obj = (SearchTableViewController *)[self.tabBarController.viewControllers objectAtIndex:0];
NSLog(@"my 2nd row= %@", [obj deneme]);

Above code assumes SearchTableViewController is at index 0 in your tab bar. If not, change it accordingly.

Even with the correct index, the array might still be nil if deneme has not yet been set by the SearchTableViewController.

1. Please read (or re-read) the docs on Tab Bar Controllers:
   • the Overview
   • the Class Reference
2. Although the original code suggestion should work, consider using better approaches to sharing data across controllers:
   • properties in the AppDelegate, see this and this (both are answers by @TechZen)
   • Singleton class

Those aren't the only two alternates for sharing data but are relatively easy to implement.