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#import 
@class BIDViewController;
@interface BIDAppDelegate : UIResponder 

@property (strong, nonatomic) UIWindow *window;

@property (strong, nonatomic) BIDViewController *viewController;
@end

#import "BIDAppDelegate.h"
#import "BIDViewController.h"
@implementation BIDAppDelegate
@synthesize window = _window;
@synthesize viewController = _viewController;

- (BOOL)application:(UIApplication *)application

didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{

self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
self.viewController = [[BIDViewController alloc]

initWithNibName:@"BIDViewController" bundle:nil];

self.window.rootViewController = self.viewController;

[self.window makeKeyAndVisible];
return YES;

}

- (void)applicationWillResignActive:(UIApplication *)application

{
/*

Sent when the application is about to move from active to inactive state. This can

occur for certain types of temporary interruptions (such as an incoming phone call or

SMS message) or when the user quits the application and it begins the transition to the

background state.

Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES

frame rates. Games should use this method to pause the game.
*/

}

- (void)applicationDidEnterBackground:(UIApplication *)application

{
/*

Use this method to release shared resources, save user data, invalidate timers, and

store enough application state information to restore your application to its current

state in case it is terminated later.

CHAPTER 3: Handling Basic Interaction 67

If your application supports background execution, this method is called instead of

applicationWillTerminate: when the user quits.
*/

}

- (void)applicationWillEnterForeground:(UIApplication *)application

{
/*

Called as part of the transition from the background to the inactive state; here you

can undo many of the changes made on entering the background.
*/

}

- (void)applicationDidBecomeActive:(UIApplication *)application

{
/*

Restart any tasks that were paused (or not yet started) while the application was

inactive. If the application was previously in the background, optionally refresh the

user interface.
*/

}

- (void)applicationWillTerminate:(UIApplication *)application

{
/*

Called when the application is about to terminate.

Save data if appropriate.

See also applicationDidEnterBackground:.
*/

}
@end

本文转自老Zhan博客园博客，原文链接：http://www.cnblogs.com/mybkn/archive/2012/03/08/2384909.html，如需转载请自行联系原作者