how to switch tab programmatically if tab bar controller is inside another ui controller? -Swift

Question

hi I am new to ios development particularly in swift. Basically I just need to switch tab, I have tried tabBarController?.selectedIndex = 1 but it seem not to switch tab.

enter image description here

the image above is my story board, the initial set up is I have splitview controller the initial view that is on master is tableViewController which is A and when tapped on the accessory of cell the detail which is detail of A appear on detail of splitview and when tapped on row itself the Tab Bar Controller replace the master

then I have four tabs in my tabBarController Tab B, Tab C, Tab D, and Tab E which is just a list when tapped it shows its respective view controller as detail of splitview then in my tab E I have 3 buttons each button designed to function to switch tab

note: the tabs and details are embedded in navigation controller

I'm a bit confuse on how and what is the standards for this. Could anyone help me any comment, suggestion would do.

Meet · Accepted Answer · 2015-05-13 05:49:32Z

9

The reason for

 tabBarController?.selectedIndex = 1

is not working, is that tabBarController is nil.

In order to get the right tabBarController, you will have to get it from the root of window object. Something like this,

var tabBarController: UITabBarController = self.window?.rootViewController as? UITabBarController
tabBarController.selectedIndex = 1

Since, you might have to find right tabBarController in your navigation stack, you will have to traverse stack as well. From the storyboard above, I believe you are loading tabbarController from a Tableview didSelect, so you will have to get tabBarController there and select tabbar index there.

Hope it helps.

answered May 13, 2015 at 5:49

Meet

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6 Comments

CaffeineShots Over a year ago

my rootviewcontroller is the tableview A so i need to go there first the switch tab?

Meet Over a year ago

Yes correct, when you add tabbarcontroller to rootviewcontroller, you need switch tab. This tabbarcontroller is launched from tableview A

CaffeineShots Over a year ago

im a bit loss, i need to go to root controller (tableview A) first then initiate tapped to one of its cell so tabbar shows, then switch tab? I'm sorry i don't have idea what should i do.

Meet Over a year ago

I believe you are launching tabbar with selected index as per user's selection of tableview row, right?

Meet Over a year ago

One more thing, tabbarcontroller should be added to window rootviewcontroller when you present it, not as subview

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Komal12 · Accepted Answer · 2017-07-20 08:57:29Z

5

In the identity inspector of the tab bar controller, I added a name to the storyboard ID "tabBarController". Within my action I add instantiate the view controller and cast UITabbarController. You'll be able to switch to the tab bar you selected. Hope this helps

@IBAction func buttonTapped(_ sender: Any) {
    let mainStoryboard = UIStoryboard(name: "Main", bundle: Bundle.main)
    let vc: UITabBarController = mainStoryboard.instantiateViewController(withIdentifier: "tabBarController") as! UITabBarController
    vc.selectedIndex = 0  
    self.present(vc, animated: true, completion: nil)
}

edited Jul 20, 2017 at 8:57

Komal12

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answered Apr 26, 2017 at 2:41

Steven Roseman

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Comments

Pixki · Accepted Answer · 2016-06-17 16:44:18Z

2

add in your AppDelegate.swift: var tabBarController: UITabBarController?

and then you can put in another Controller self.tabBarController!.selectedIndex = 0

worked for me

answered Jun 17, 2016 at 16:44

Pixki

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