当用户点击推送通知时，关闭当前ViewController并打开新ViewController的最佳方法是什么

Question

When user tap push notification, what is the best way to close current UIViewController and open new UIViewController ?

for example,

A(Base UIViewController ) open B( UIViewController ) and open C( UIViewController )

and use tap home button, so app will enter background,

after then when a user receive a push notification, and tap it,

app will enter foreground.

I want to close B, C UIViewController (C controller may be opened or not), and open D( UIViewController )

like this A->D

Would you give me some tips?

Answer 1

Well, when you will come from push, that means you will be coming from didReceiveRemoteNotification .

Write below line of code in didReceiveRemoteNotification

NSMutableArray *navigationArray = [[NSMutableArray alloc] initWithArray: self.navigationController.viewControllers];

[navigationArray removeAllObjects];    // This is just for remove all view controller from navigation stack.
// [navigationArray removeObjectAtIndex: 2];  // You can pass your index here
self.navigationController.viewControllers = navigationArray;
[navigationArray release];

I hope this is clear.

Note: As you are accessing navigation controller in app delegate, use below to access navigation controller.

(UINavigationController *)self.window.rootViewController

Answer 2

The method I've followed was, in AppDelegate.m file you can implement the

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo

Inside that you can have mechanism to identify the type of notification and according to that you can post your own notification using NSNotificationCenter

[[NSNotificationCenter defaultCenter] postNotificationName:@"openMyView" object:nil userInfo:myInfoDic];

Then inside notification observer method, you can perform a segue to your UIViewController that needs to display

[self performSegueWithIdentifier:@"toMySegue" sender:myDataDic];

You have to create the segue with the mentioned name in storyboard too. Hope you are familiar that process already.