UISplitViewController using delegate to pass a string - ios

Question

I'm using a Split View Controller for an iPad app. I'm trying to send a label change to the detailReceiving Controller from the rootSending Controll when a button is pushed. I've read through tutorials on protocols and came up with the code below. When I click the button on rootSending, nothing happens to the label on detailReceiving. Do I have to do something else with a splitViewContoller so that the label will update? Shouldn't detailReceiving change the label when it receives the message?
rootSending.h
#import <UIKit/UIKit.h>
#protocol TestDelegate <NSObject>
-(void)tester:(NSString*)testString;
#end
#interface rootSending : UIViewController
#property (nonatomic, assign) id <TestDelegate> delegate;
#end
rootSending.m
#import "rootSending.h"
#implementation rootSending
#synthesize delegate;
-(void)viewDidLoad{
}
-(IBAction)buttonPressed:(id)sender{
[delegate tester:#"button pressed"];
}
#end
detailReceiving.m
#import "detailReceiving.h"
#import "rootSending.h"
#interface detailReceiving ()<TestDelegate>{
IBOutlet UILabel *label2;
}
#end
#implementation detailReceiving
-(void)viewDidLoad{
rootSending *obj = [rootSending alloc];
obj.delegate = self ;
}
-(void)tester:(NSString *)testString{
label2.text = testString;
}
#end

Answer 1

First of all, never ever have an alloc without an init! But in this case, even if you did use alloc/init, it still wouldn't work because that just creates a new instance of rootSending, not the one that you have in your split view. You need to get a reference to the one you have, which you can get from the split view controller,
-(void)viewDidLoad{
rootSending *obj = (rootSending *)self.splitViewController.viewControllers.firstObject;
obj.delegate = self;
}
After Edit:
If your mate controller is embedded in a navigation controller, then you need to get the navigation controller's topViewController to get your reference.
-(void)viewDidLoad{
UINavigationController *nav = (UINavigationController *)self.splitViewController.viewControllers.firstObject;
xmlListOfItems *obj = (xmlListOfItems *)nav.topViewController;
obj.delegate = self;
}