To access the delegate variable

1.To access the Appdelegate varaiables

demo123AppDelegate.h

@interface demo123AppDelegate : NSObject <UIApplicationDelegate>

{

// To decleare the variables

Ex:

NSMutableArray *img_Preview;

}

demo123AppDelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{

img_Preview=[[NSMutableArray alloc]init];

// Override point for customization after application launch.

self.window.rootViewController = self.viewController;

[self.window makeKeyAndVisible];

return YES;

}

demo123ViewController.h

// Declare the Delegate class

@class demo123AppDelegate;

@interface demo123ViewController : UIViewController

{

// create a instance for delegate class

demo123AppDelegate *appDelegate;

}

demo123ViewController.m

// import the delegate class here

#import "demo123AppDelegate.h"

- (void)viewDidLoad

{

appDelegate=(demo123AppDelegate *)[[UIApplication sharedApplicatio]delegate];

[super viewDidLoad];

}

// To access the variable appDelegate.img_Preview