让Ipad应用程序的default。png等待时间为5秒

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

[NSThread sleepForTimeInterval:5]; //是不是很简单呀

// Add the view controller's view to the window and display.

[self.window addSubview:viewController.view];

[self.window makeKeyAndVisible];

return YES;

}