// registe remote notification
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
     // Let the device know we want to receive push notifications
     [[UIApplication sharedApplication] registerForRemoteNotificationTypes:(UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeSound | UIRemoteNotificationTypeAlert)];

     // other code
     return YES;
}

#pragma mark -
#pragma mark APN
- (void)application:(UIApplication*)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData*)deviceToken
{
     NSLog(@"My token is: %@", deviceToken);
     // send token to server
}
- (void)application:(UIApplication*)application didFailToRegisterForRemoteNotificationsWithError:(NSError*)error
{
     NSLog(@"Failed to get token, error: %@", error);
}
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo
{
    NSLog(@"收到推送： %@",userInfo);
    if ([[userInfo objectForKey:@"aps"] objectForKey:@"alert"]!=NULL) {
        UIAlertView* alert = [[UIAlertViewalloc] initWithTitle:@"推送通知"
                                                        message:[[userInfo objectForKey:@"aps"] objectForKey:@"alert"]
                                                       delegate:self
                                              cancelButtonTitle:@"关闭"
                                              otherButtonTitles:@"更新状态",nil];
        [alert show];
        [alert release];
    }
}