Question

I know there as various posts regarding global variables in SO, but nothing helped.
My problem is-
In my AppDelegate.h I declared two variables x and y. In my ClassA, I imported AppDelegate.h and added:

AppDelegate  mainDelegate = (AppDelegate *)[[UIApplication sharedApplication]delegate];

and assigned values to mainDelegate.x and mainDelegate.y.

In ClassB, I assigned these x and y as

label1.text = mainDelegate.x;
label2.text = mainDelegate.y;

No errors,but it is null..nothing appears as label’s text.

Could anyone please help..

EDIT:
In AppDelegate.h:

@property (nonatomic, copy) NSString *x,*y;

In ClassA.m

mainDelegate.x=[[NSString alloc] initWithString:[homeArray objectAtIndex:indexPath.row]];

This mainDelegate.x I am trying to get from ClassB and it is null.

Answer 1

You should use

@property (nonatomic, copy) NSString *x,*y; 

and not

@property (nonatomic, retain) NSString x,y; 

By using copy, you are ensuring that the text labels stay consistent. While retain means that if you change the values of x and y somewhere, your text labels will also change.