How to pass data viewcontroller via Tab bar Controller - uitabbarcontroller

Question

I want to pass datum from view controller to view controller via tab bar controller.
I mean, my storyboard is like this.
View Controller → Tab Bar Controller → VC1/VC2/VC3
For the purpose of this, I tried to use PrepareforSegue, but it's failed.
The code is here.
(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
NSIndexPath *selectedIndexPath = [self.tableView indexPathForSelectedRow];
friendsDetailViewController* vc = [[friendsDetailViewController alloc] init];
vc = (friendsDetailViewController*)[segue destinationViewController];
vc.candidateid = [[NSString alloc] init];
vc.candidateid = [candidateid objectAtIndex:selectedIndexPath.row];
Though I was trying to pass data from VC to VC1, SIGABT happened on the last line.
Update:
I've got figured out how. Here is the script:
friendsDetailViewController* vc = [[friendsDetailViewController alloc] init];
UITabBarController* tbc = [segue destinationViewController];
vc = (friendsDetailViewController*)[[tbc customizableViewControllers] objectAtIndex:0];
Firstly, I have to attach Tab Bar Controller.
Secondly, retrieve each View Controller's pointer.
You can select by using objectIndex.

Answer 1

In childviewcontrollers of tab bar controllers you can easily pass data by using
[self.parentViewController.view setAccessibilityValue:#"your data"];
and can easily access this data in other child viewcontrollers of tabbar
or you can add an object in nsuserdefaults for some key and attach that key in parentviewcontroller.view ..
get that object by using objectforkey from nsuserdefaults in next viewcontroller

Answer 2

I had same problem.
I had NSString which i waned to be sent like this:
View Controller → Tab Bar Controller → VC1/VC2/VC3
Before anything else I created ViewController-s and TabBarController classes and connected them with storyboard.
This worked for me:
First lets send data from ViewController to TabBarController:
add segue to connect ViewController and TabBarController in storyboard and name it:
toMyTabController
add property u want to change in TabBarController:
#property (strong, nonatomic) NSString *name;
add this method somewhere in ViewController.m:
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if([segue.identifier isEqualToString:#"toMyTabController"])
{
MyTabController *tabController = (MyTabController *)segue.destinationViewController;
tabController.name = #"SOME AWESOME NAME";
}
}
==================================================================================
Now lets send data from TabBarController to ViewController
Add property to every ViewController where you want to send info, and lets name it name (so creative)
add this to **ViewController1.h, ViewController2.h, ViewController3.h
#property (strong, nonatomic) NSString *name;
add this to ViewController1.m, ViewController2.m, ViewController3.m
#synthesize name;
go to your TabBarController.m and add this in ViewDidLoad method:
for (UIViewController* myController in self.viewControllers)
{
if([myController respondsToSelector:#selector(setName:)])
{
[myController performSelector:#selector(setName:) withObject:self.name];
}
}
Thats all,
Hope it helps. Good Luck