I have the following Storyboard layout:
When the app starts it goes to HomeView VC
at TabIndex 1.
In the HomeView
I have a button and I segue to the TestView
using
performSegue(withIdentifier: "goToStartTest", sender: self)
Now I want to go from TestView
to HistoryView
. The only way I can see to do that right now is to create a segue from TestView
to TabBarController
. This brings up HomeView
with Tab Bar intact. I do this from TestView
using
performSegue(withIdentifier: "testToRes", sender: self)
However, that leaves me on HomeView
, I need HistoryView
.
The research I've done points to using Unwind and detecting where segue came from and acting accordingly.
I'm using the latest Xcode with Swift 5.
Set up your HomeViewController
like this:
class HomeViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
var goToHistory = false
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
if goToHistory {
goToHistory = false
// Use whichever index represents the HistoryViewController
self.tabBarController?.selectedIndex = 1
}
}
@IBAction func unwindAndGoToHistory(_ segue: UIStoryboardSegue) {
goToHistory = true
}
}
In your TestViewController
, either:
Wire a UIButton
to the Exit
icon to unwind to unwindAndGoToHistory:
.
OR
Create a programmatic unwind by wiring from the View Controller
icon to the Exit
icon (again selecting unwindAndGoToHistory:
), and then find this segue in the Document Outline view and give it an identifier such as "unwindToHistory"
in the Attributes Inspector. When you're ready to segue, trigger it with performSegue(withIdentifier: "unwindToHistory", sender: self)
.
Then, when the unwind segue is triggered, iOS will pop the TestViewController
and call unwindAndGoToHistory()
. In there, goToHistory
gets set to true
. Afterwards, viewWillAppear()
will be triggered. Since goToHistory
is now true
, the code will set the selectedIndex
of the tabBarController
to switch to the HistoryViewController
's tab.
Note: This will show the unwind animation back to
HomeViewController
, then the view will automatically switch toHistoryViewController
. If instead you'd like to switch toHistoryViewController
immediately with no animation, overrideviewWillAppear
instead ofviewDidAppear
.