I have created a TabBarController with 4 UIViewControllers. However, when I want to show one of the ViewControllers in the TabBarController with:
func gotoMainAppVC()
{
let mainVC:SearchVC = SearchVC()
self.present(mainVC, animated: true, completion: nil)
}
I only get a plain black screen. What am I doing wrong?
This is not how any of this works.
I am not sure what self is in your context but I expect it is either a tab bar controller or one of the view controllers on the tab bar.
By calling present it means you want to present a view controller on a current one which by default brings a new fullscreen view controller from bottom upwards.
Since you have created a new instance of view controller by calling SearchVC() this is not the view controller that you see in your storyboard. You may create any instances of any of your view controllers but in your case if you designed SearchVC in a storyboard you want to actually use that version of it. To do so you need to set storyboard id inside your storyboard. After you have done that you should initialise it as using:
UIStoryboard(name: <#T##String#>, bundle: nil).instantiateViewController(withIdentifier: <#T##String#>)
as in
let mainVC:SearchVC = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "TheIDIHaveSet") as! SearchVC
But again this will not give you the view controller that is inside your tab bar but create a new instance. And it will not instert it as one of the tabs but present a new full screen view controller.
Related
I am using this code
let storyboard = UIStoryboard.init(name: "Main", bundle: nil)
let controller = storyboard.instantiateViewController(withIdentifier: "PrintMainViewController")
self.navigationController!.pushViewController(controller, animated: true)
and also added:
self.tabBarController?.tabBar.isHidden = false
If I understand your hierarchy correctly you have a tab bar controller which has navigation controllers in it. So basically any of the tabs can push additional view controllers and tab bar is still visible.
Now you want to push some new controller on the currently selected view controller in the tab bar and you want to do it from another part of the app, another view controller that has no relation to tab bar.
The quickest way to do that is to expose a static instance of your tab bar view controller. This will only work if you always have only 1 tab bar controller in your application (probably 99% of the applications).
First add a current instance to your tab bar view controller:
class MyTabBarViewController: UITabBarController {
static private(set) var currentInstance: MyTabBarViewController?
override func viewDidLoad() {
super.viewDidLoad()
MyTabBarViewController.currentInstance = self
}
}
So when view loads a static value is assigned and can now be accessed anywhere in your project via MyTabBarViewController.currentInstance.
The rest is then just accessing the currently selected view controller and pushing a new view controller. Something like this should do:
let storyboard = UIStoryboard.init(name: "Main", bundle: nil)
let controller = storyboard.instantiateViewController(withIdentifier: "PrintMainViewController")
(MyTabBarViewController.currentInstance?.selectedViewController as? UINavigationController)?.pushViewController(controller, animated: true)
You must push in TabBarController
self.tabBarController?.pushViewController(controller, animated: true)
I am working with UISplitViewController. I have UISplitViewController which contain UITabBarController. So I want to display tab bar in all the screen through out the application (Even in detail screen of UISplitViewController for iPhone). Please see the approach:
use segue to move from one controller to another controller or move via navigation so in the next controller your tabbar will be show
just like if u want to move from A to B Controller set stroyboard id ie "SecondVc"
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let vc = storyboard.instantiateViewController(withIdentifier: "SecondVc")
self.navigationController?.pushViewController(vc, animated: true)
or just make connection using storyboard
I've separated my views into multiple storyboards to make managing the project as a team much easier. The only problem is that I want to have the navigation bar across all of my different view controllers. I embedded the first view controller in a navigation controller which added the navigation bar. In my second storyboard, I wanted to constrain a view to the navigation bar, however, since this view controller isn't embedded in a navigation controller, there isn't anything to constrain the view to. I put a navigation bar without a navigation controller to constrain to, however, when I perform the segue from the first storyboard, this results in two navigation bars. How do I make this so that I can constrain the view to the navigation bar without having two of them? Thanks in advance!
You can go from on view controller to another by three way:-
First using segue as you are already doing
second You can Present your view controller by
let storyboard = UIStoryboard(name: "MyStoryboardName", bundle: nil)
let controller = storyboard.instantiateViewController(withIdentifier: "someViewController")
self.present(controller, animated: true, completion: nil)
Third You can Navigate View controller by
let storyboard = UIStoryboard(name: "MyStoryboardName", bundle: nil)
let controller = storyboard.instantiateViewController(withIdentifier: "someViewController")
self.navigationController?.pushViewController(controller, animated: true)
I'm not sure your problem. I guess that you want to use ONE navigation bar to constrain many UIViewController in different Storyboard. Here is my answer.
Step 1: Set up Storyboard ID in each UIViewController
Step 2: push new UIViewController
func switchNextView() {
let storyboardName:String = "xxxxxx"
let storyboardId:String = "xxxxx"
let storyboard = UIStoryboard(name: storyboardName, bundle: nil)
let vc: UIViewController =
storyboard.instantiateViewController(withIdentifier: storyboardId) as!
UIViewController
self.navigationController?.pushViewController(vc, animated: true)
}
I have an app that I need to display a pin code screen every time the app is opened. I'm successfully displaying the modal view, but it doesn't cover the navigation bar at the top, and it doesn't cover the tab bar at the bottom. I believe it's because of how I'm presenting it, but I'm not seeing a way to change it.
This is how I'm presenting the controller
let newVC = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "LoginView")
let view = window?.rootViewController as! UITabBarController
view.selectedViewController?.show(newVC, sender: nil)
This is the storyboard to give you an idea of the app.
The problem is your use of UIViewController's api, show. The function is overridden by UINavigationController in this case and push will be used to present the view controller. If your plan is to modally present a view controller, rather use present
selectedViewController?.present(newVC, animated: true, completion: nil)
I got the problem is I cannot make go back previous ViewController of different storyboard from NavigationController in TabViewController.
I've already tried with
_ = navigationController?.popViewController(animated: true)
unfortunately, it does not work. And I know that it can be going back with segue but it's not good practice. Please let me know how to do it. Thanks. Following is my hierarchy.
I had the same issue. In this case I am on a different Storyboard and want to return to the Main Storyboard and present the first view controller. Since this controller is embedded in a Navigation Controller that is embedded in a Tab Bar controller, you must instantiate the Tab Bar Controller. Be sure to set the indentifier on the Tab Bar Controller as "TabBarController"... or whatever you like.
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let controller = storyboard.instantiateViewController(withIdentifier: "TabBarController") as! UITabBarController
self.present(controller, animated: true, completion: nil)