Passed NSString always null - ios

Question

I need to pass an NSString from one view to another. I do in my first view controller:
-(IBAction)btnCreate_click:(id)sender
{
CreateMatchTableViewController *matcObj = [[CreateMatchTableViewController alloc]init];
matcObj.createBtnPressed = #"pressed";
[self.tabBarController setSelectedIndex:1];
}
CreateMatchTableViewController is my second view controller and createBtnPressed ia NSString object in second view controller.
In viewDidLoad of second view controller:
- (void)viewDidLoad
{
[super viewDidLoad];
// MatchListViewController *obj = [[MatchListViewController alloc]init];
NSString *stringFromFirstView = createBtnPressed;
NSLog(#"check===>%#",stringFromFirstView);//...always null
}
Please help!!

Answer 1

Seems that in your first view controller you are creating a new instance of CreateMatchTableViewController. You do not want that because you have your CreateMatchTableViewController instance already in the tab bar controller...
Try something like this:
-(IBAction)btnCreate_click:(id)sender
{
CreateMatchTableViewController *matcObj = [self.tabBarController.viewControllers objectAtIndex:1];
matcObj.createBtnPressed = #"pressed";
[self.tabBarController setSelectedIndex:1];
}
EDIT
-(IBAction)btnCreate_click:(id)sender
{
UINavigationController *navigationController = [self.tabBarController.viewControllers objectAtIndex:1];
CreateMatchTableViewController *matcObj = [[navigationController viewControllers] objectAtIndex:0];// I put 0 assuming you have a CreateMatchTableViewController as the navigation controller's root view controller
matcObj.createBtnPressed = #"pressed";
[self.tabBarController setSelectedIndex:1];
}

Answer 2

on CreateMatchTableViewController write a method like following:
(void)setStringFromFirstViewController:(NSString*)str{
NSString *stringFromFirstView = str;
NSLog(#"check===>%#",stringFromFirstView);
}
Now on "first view controller" do the following:
-(IBAction)btnCreate_click:(id)sender{
CreateMatchTableViewController *matcObj = [[CreateMatchTableViewController alloc]init];
[matcObj setStringFromFirstViewController: #"pressed"];
[self.tabBarController setSelectedIndex:1];
}

Answer 3

Try
NSString* a = [[NSString alloc] initWithString:createBtnPressed];