Switch tab bar include sending data - ios

Question

How can i change the tab bar? i know this post seems duplicate but i cant find any exist question that similar to me. Right now my current
selectedIndex = 0
so i want to make it go to tab number 3 which is
selectedIndex = 2
But i also want to send data from currentView to nextView. if i using push+selectedindex it will go to tab 3 but push the view from selectedindex = 0, and there is no data send to selectedIndex = 2
My current code
func redeemBtnPressed(_ sender: UIButton) {
let selectedRedeemBtnInfo = fixedGridInfo[sender.tag] as! Dictionary<String, AnyObject>
sender.showsTouchWhenHighlighted = true
let storyboard = UIStoryboard(name: "FlightExploration", bundle: nil)
let searchFlightVC = storyboard.instantiateViewController(withIdentifier: "SearchFlightVC") as! SearchFlightViewController
var newFlightType = String()
if "\(selectedRedeemBtnInfo["FlightType"]!)" == "Return" {
newFlightType = "Round"
} else {
newFlightType = "One"
}
searchFlightVC.flightType = newFlightType
searchFlightVC.fromHome = true
searchFlightVC.departure = "\(selectedRedeemBtnInfo["Departure"]!) (\(selectedRedeemBtnInfo["DepartureCityCode"]!)"
searchFlightVC.arrival = "\(selectedRedeemBtnInfo["Destination"]!) (\(selectedRedeemBtnInfo["DestinationCityCode"]!)"
self.navigationController?.pushViewController(searchFlightVC, animated: true)
tabBarController?.selectedIndex = 2
}

Answer 1

You can try this to send the data to that UIViewController which is a ViewController of UITabBarController
var yourViewController : TempViewController
if let arrController = tabBarController?.viewControllers {
for vc in arrController {
if vc is TempViewController {
yourViewController = vc as! TempViewController
}
}
}
yourViewController.yourData = dataToPass
tabBarController?.selectedIndex = 2

Answer 2

Modified from Rajat's answer seems helped me to solved the issue
func redeemBtnPressed(_ sender: UIButton) {
let selectedRedeemBtnInfo = fixedGridInfo[sender.tag] as! Dictionary<String, AnyObject>
sender.showsTouchWhenHighlighted = true
var newFlightType = String()
if "\(selectedRedeemBtnInfo["FlightType"]!)" == "Return" {
newFlightType = "Round"
} else {
newFlightType = "One"
}
if let arrController = tabBarController?.viewControllers {
for vc in arrController {
if vc.childViewControllers[0] is SearchFlightViewController {
let displayViewController = vc.childViewControllers[0] as! SearchFlightViewController
let _ = displayViewController.navigationController?.popToRootViewController(animated: true)
//displayViewController.flightType = newFlightType
displayViewController.flightTypeFromHome = newFlightType
displayViewController.fromHome = true
displayViewController.departure = "\(selectedRedeemBtnInfo["Departure"]!) (\(selectedRedeemBtnInfo["DepartureCityCode"]!)"
displayViewController.arrival = "\(selectedRedeemBtnInfo["Destination"]!) (\(selectedRedeemBtnInfo["DestinationCityCode"]!)"
displayViewController.flightType = "Round"
displayViewController.departureDateLbl = "Select One"
displayViewController.passenger = "1 Adult"
displayViewController.adultCount = 1
displayViewController.childCount = Int()
displayViewController.infantCount = Int()
tabBarController?.selectedIndex = 2
tabBarController?.tabBar((tabBarController?.tabBar)!, didSelect: (tabBarController?.tabBar.items?[2])!)
}
}
}
}

Answer 3

Rajat's answer Switch Tab Bar and Pass data, in Swift 4.2, iOS 11 need some changes to be done:
func switchToTab2(){}
var yourViewController = MyTab2ViewController()
if let arrController = self.tabBarController?.viewControllers {
for vc in arrController {
if vc is MyTab2ViewController {
yourViewController = vc as! MyTab2ViewController
yourViewController.productTitle = "Title"
self.tabBarController?.selectedIndex = 1 /// tabs start from 0
}
}
}
}
MyTab2ViewController is your viewcontroller connected to tab bar with index 1. (first tab index: 0)