I'm trying to present a SharkProfileTableViewController from my Main.storyboard file with a TabBarViewController from a button action in a modal view in Upload.storyboard that has no tab bar.
The ViewController I'm trying to present is a selected item from a SharksTableViewController tableview based on the data from the modal view.
How do I show the SharkProfileViewController along with the TabBarViewController?
#IBAction func viewProfileButtonPressed(_ sender: UIButton) {
let stb = UIStoryboard(name: "Main", bundle: nil)
let tabBar = stb.instantiateViewController(withIdentifier: "tabBar") as! TabBarViewController
let sharkTabBar = stb.instantiateViewController(withIdentifier: "sharkTableView") as! SharksTableViewController
let sharkProfile = stb.instantiateViewController(withIdentifier: "sharkProfile") as! SharkProfileTableViewController
sharkProfile.selectedShark = shark as JSONObject
tabBar.selectedIndex = 3
self.present(tabBar, animated: true) {
}
}
TabBarController - the 'Shark' tab is the tab that should show
SharksTableViewController - when selecting an item in this tableview it presents the ...
SharkProfileTableViewController - this is the view I'm trying to present (with the tab bar showing)
If you want to pass any data to SharkProfileTableViewController that you have added in UITabbarController then you can access it using the viewControllers property of UITabbarController. viewControllers property will return array of UIViewController so you need to access it using subscript with your controller index in Tabbar.
#IBAction func viewProfileButtonPressed(_ sender: UIButton) {
let stb = UIStoryboard(name: "Main", bundle: nil)
let tabBar = stb.instantiateViewController(withIdentifier: "tabBar") as! TabBarViewController
//If SharkProfileTableViewController at 4 position in tabbar then access it from array like this
let nav = tabBar.viewcontrollers?[3] as! UINavigationController
let sharkProfile = stb.instantiateViewController(withIdentifier: "sharkProfile") as! SharkProfileTableViewController
sharkProfile.selectedShark = shark as JSONObject
tabBar.selectedIndex = 3
self.present(tabBar, animated: true) {
nav.pushViewController(sharkProfile, animated: false)
}
}
Now you need to simply change index in viewcontrollers?[3] to access other controller from array.
Related
I want to change the default selected view controller of a UITabBar / UITabBarController via selectedIndex.
I tried other solutions I saw in other threads, like changing it in the AppDelegate or in ViewDidAppear like this:
class MainTabBarController: UITabBarController {
override func viewDidLoad() {
super.viewDidLoad()
setupTabBar()
}
override func viewDidAppear(_ animated: Bool) {
// this is the attempt to set the selected index that doesn't work
self.tabBarController?.selectedIndex = 2
}
func setupTabBar(){
let vc1 = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "mainvc")
let vc2 = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "secondvc")
let vc3 = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "thirdvc")
let FirstController = UINavigationController(rootViewController: vc1)
let SecondController = UINavigationController(rootViewController: vc2)
let ThirdController = UINavigationController(rootViewController: vc3)
viewControllers = [FirstController, SecondController, ThirdController]
}
}
Nothing worked so far, and it always shows the selected index = 0.
I set the tab bar view controller as the initial view controller in the Main storyboard. Should I be doing this in the AppDelegate instead?
You are saying that
class MainTabBarController: UITabBarController {
so self refers to a UITabBarController, but you are setting the selected index of tabBarController of self:
self.tabBarController?.selectedIndex = 2
There are no tab bar controllers embedded in self. self itself is a tab bar controller! You can just set self.selectedIndex:
self.selectedIndex = 2
Also, you should do that in viewDidLoad instead of viewDidAppear, because viewDidAppear can happen many times (every time some modal controller is dismissed for example). viewDidLoad will only be called once.
I have a UITabBarController and all my other view controllers are connected to it. Now I want to show one my controller as:
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let vc: ViewController = storyboard.instantiateViewControllerWithIdentifier("ViewController") as! ViewController
but when I tried to:
let rootViewController = self.window?.rootViewController as! UINavigationController
rootViewController.pushViewController(vc, animated: true)
it gave me the next error:
Could not cast value of type 'UITabBarController' (0x1a899b818) to 'UINavigationController'
Later I've tried to do:
let rootViewController = self.window?.rootViewController as! UITabBarController
but in this case I get
UITabBar has no member pushViewController
How can I show/push my ViewController so it will appear with UINavigationBar and inside of UITabBar?
You need to place each of your view controllers inside a navigation controller.
E.g. currently you have a TabBarViewController
and two view controllers:
ViewControllerA
ViewControllerB
What you need to do is to embed each of them inside a navigation controller so you would have:
UINavigationController -> ViewControllerA
UINavigationController -> ViewControllerB
In order to push a new controller you would do:
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let vc: ViewController = storyboard.instantiateViewControllerWithIdentifier("ViewController") as! ViewController
let navViewController = myTabBar.selectedViewController as? UINavigationController
navViewController?.pushViewController(vc, animated: true)
Could not cast value of type 'UITabBarController' (0x1a899b818) to 'UINavigationController'
Your root view controller is of type UITabBarController.
Therefore you have to use the appropriate methods of this class and not UINavigationController.
To set view controllers use either
var viewControllers: [UIViewController]? or
func setViewControllers([UIViewController]?, animated: Bool).
To have a navigation bar you have to instantiate a UINavigationController and add your view controller to this navigation controller.
Then add your navigation controller to your UITabBarController with via one of the above options.
If your class is UITabBarController
You can add this:
private func showViewController() {
let storyboard = UIStoryboard(name: "Main", bundle: nil)
guard let vc = storyboard.instantiateViewController(withIdentifier: "queueTableViewController") as? QueueTableViewController else { return }
let navVC = self.selectedViewController as? UINavigationController
navVC?.pushViewController(vc, animated: true)
}
This will allow you to go to any VC
The second solution is something like this.
Here You will show the last VC and from there push some VC.
guard let tabCount = viewControllers?.count, tabCount > 1 else { return }
selectedIndex = tabCount - 1
if let navigationController = viewControllers?[selectedIndex] as? UINavigationController {
if let accountVC = navigationController.visibleViewController as? FirstViewController {
let storyboard = UIStoryboard(name: "Main", bundle: nil)
guard let vc = storyboard.instantiateViewController(withIdentifier: "someViewController") as? SomeViewController else { return }
accountVC.navigationController?.pushViewController(vc, animated: true)
}
}
I wonder how I can check what view controller that is currently displayed.
When a user recivies a notification and press on it I want to take the user to a certain VC. But only if the user is not already there.
I am using this when I get a notification:
if let tabBarController = self.window!.rootViewController as? CustomTabBarController {
let navInTab:UINavigationController = tabBarController.viewControllers?[0] as! UINavigationController
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let destinationViewController = storyboard.instantiateViewController(withIdentifier: "EventVc") as? EventsViewController
navInTab.pushViewController(destinationViewController!, animated: true)
tabBarController.selectedIndex = 0
}
I dont want to run this code if the user already is in EventVc
Also, can I run the code above if the user already is in tab 0 but in a different VC than EventVc?
And if it is any help my app is built like this:
(root) TabBar
(tab1) -> navigation controller -> vc -> vc...
(tab2) -> navigation controller -> vc -> vc...
(tab3) -> navigation controller -> vc -> vc...
(tab4) -> navigation controller -> vc -> vc...
this function should solve your problem, just send index number as an argument (forexample: 0 for tab1, 1 for tab2 etc.) at it navigates you selectedIndex ViewController.
// Navigation TabIndex TabBar View Controller
fileprivate func goTabIndex(index: Int) {
let storyboard = UIStoryboard(name: "yourTabbarStoryboardID", bundle: nil)
let tabBarController = storyboard.instantiateViewController(withIdentifier: "EventVc") as! UITabBarController
tabBarController.selectedIndex = index
self.window?.makeKeyAndVisible()
DispatchQueue.main.async {
self.window?.rootViewController?.present(tabBarController, animated: false)
}
}
You can find the Presenting ViewController like this;
let presentingVC = self.window?.rootViewController?.presentingViewController
Presented ViewController;
let presentedVC = self.window?.rootViewController?.presentedViewController
My goal is whenever i click a button on a first view controller, then it will navigate to another controller which is a navigation controller.
firstViewController and secondViewController has no connection or anything.
Picture
I used this code
#IBAction func buttonTapped(sender: UIButton) {
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let vc = storyboard.instantiateViewControllerWithIdentifier("secondViewCtrl") as! SecondViewController
self.presentViewController(vc, animated: true, completion: nil)
}
The reason why i instatiate so that I could pass data like
vc.name = "Myname"
The problem with this code is that it doesn't present navigation bar and as well as the tab bar. What should I do to show both?
Updated question
#IBAction func buttonTapped(sender: UIButton) {
guard let tabBarController = tabBarController else { return }
tabBarController.selectedIndex = 1
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let vc = storyboard.instantiateViewControllerWithIdentifier("trackYourGenie") as! TrackYourGenieViewController
let navController = tabBarController.viewControllers![1]
let secondViewController = navController.topViewController
vc.name = "Myname"
}
You are instantiating the view controller hence you wouldn't get the navigation bar. To get the navigation bar please instantiate navigation controller and since the second view is only child you would get the second view by default.
#IBAction func buttonTapped(sender: UIButton) {
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let vc = storyboard.instantiateViewControllerWithIdentifier("Navigation Controller Id") as! UINavigationController
self.presentViewController(vc, animated: true, completion: nil)
}
The above code should give you the navigation bar.
A safe approach:
guard let tabBarController = tabBarController else { return }
tabBarController.selectedIndex = 1
If you need to access to your tabBarController to pass datas you can do simply:
let navController = tabBarController.viewControllers[1]! as! UINavigationController
let secondViewController = navController.topViewController
Your method could be:
#IBAction func buttonTapped(sender: UIButton) {
guard let tabBarController = tabBarController else { return }
let navController = tabBarController.viewControllers[1]! as! UINavigationController
let secondViewController = navController.topViewController as! SecondViewController
secondViewController.name = "my name"
tabBarController.selectedIndex = 1
}
In your case, the following code should be sufficient :
self.tabBarController.selectedIndex = 1
As UITabBarController is your rootViewController, you can access it with self.tabBarController. You don't have to instantiate UINavigationController as it is in the storyboard.
I can see from your StoryBoard that you have a TabBarController. If your configuration is that and FirstViewController is on first tab and SecondViewController on second tab, you can just change TabBarController selectedIndex property:
#IBAction func buttonTapped(sender: UIButton) {
tabBarController?.selectedIndex = 1
}
If you want to pass data to SecondViewController you can try one of these solutions:
let controller = tabBarController.viewControllers[1] as SecondViewController!
controller.data = "some data"
This soultion could not work since SecondViewController is not ready yet.
Create a singleton class where to save data, then retrieve data in SecondViewController viewDidLoad method
Save data in UserDefaults, then retrieve data in SecondViewController viewDidLoad method (bad solution if information doesn't have to be persistent)
Extend UITabBarController and use it, create a custom var in tabBarController, put data in that variable and then retrieve data in SecondViewController viewDidLoad method
Then clear data if needed.
Navigation will not work from firstViewController as to navigate something we need UINavigationController.
Try Like This
I have a tab bar, whose items I want to change depending on a user's settings. So I need to be able to add/remove items from the tab bar programmatically. Here is my code:
class TabBarViewController: UITabBarController {
var controllerArray = [UIViewController]()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
self.tabBar.tintColor = UIColor.greenColor()
let storyBoard = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle())
let controller1 = storyBoard.instantiateViewControllerWithIdentifier("Navigation2") as! nav2
let controller2 = storyBoard.instantiateViewControllerWithIdentifier("Explore") as! ExploreNavigation
let controller3 = storyBoard.instantiateViewControllerWithIdentifier("friends") as! ExploreNav
let controller4 = storyBoard.instantiateViewControllerWithIdentifier("controller3ID") as! controller3VC
controllerArray.append(controller1)
controllerArray.append(controller2)
controllerArray.append(controller3)
controllerArray.append(controller4)
self.tabBarController?.setViewControllers(controllerArray, animated: true)
}
}
but if I comment out one of the lines, for example like this:
//controllerArray.append(controller2)
so that that controller is not apart of the controllersArray, the controller still displays in the tab bar. What am I doing wrong?
I also tried this, and it didn't work either:
self.tabBarController?.viewControllers = controllerArray
Just say
self.setViewControllers(controllerArray, animated: true)
instead of
self.tabBarController?.setViewControllers(controllerArray, animated: true)
You are subclassing UITabBarController not UIViewController so you don't have, or at least don't need, the property tabBarController.