I'm new to swift and IOS development. I'm working on a tabbed application(3 views). For example, FirstView, SecondView and ThirdView. FirstView has a button that opens a addNewSession view and the addNewSession view has a Back button that back to the FirstView. The problem is Tab bar disappears after back from the addNewSession view
FirstView to addNewSession view.
#IBAction func toAddNew(sender: AnyObject) {
let addNewSession = self.storyboard?.instantiateViewControllerWithIdentifier("addNewSession") as addNew
self.presentViewController(addNewSession, animated: true, completion: nil)
}
addNewSession view to FirstView
#IBAction func backToPrev(sender: AnyObject) {
println("test1")
let FirstView = self.storyboard?.instantiateViewControllerWithIdentifier("FirstView") as FirstViewController
self.presentViewController(FirstView, animated: true, completion: nil)
}
The problem is your backToPrev method is instantiating a new FirstViewController, which is not the same instance you came from. You are not really going back to the original one, you are showing a new one. This is not what you want.
The proper way to do this is to embed the FirstViewController in a navigation controller, then push the addNew controller onto it. When you use a nav controller, you get the Back behavior for free.
Hopefully you are using a storyboard? Select your FirstViewController, go to the Editor menu and choose Embed in Navigation Controller.
In your toAddNew, instead of presentViewController use self.navigationController.pushViewController to push your addNew controller.
There's an even easier way to do this last step, using segues. You control drag in the storyboard from your button in FirstViewController to the addNew controller and create a Show segue. This will automatically show your addNew controller when the button is touched. With this approach, you will want to remove your toAddNew IBAction and the connection since it's redundant.
Related
Within my app, I want to create a user profile controller, which can be navigated to from several different controllers. I would like it to have a back button that will take the user back to whichever controller they came from.
How do I do this?
Dismiss
Add UIButton for back navigation somewhere to your UserProfileController. Then in UserProfileController create action and set it as action of your button. This action dismisses your UserProfileController (so you get back to previous UIViewController)
#IBAction func backButtonPressed(_ sender: UIButton) {
dismiss(animated: true, completion: nil)
}
UINavigationController
Alternatively you can have previous ViewControllers embed in UINavigationController. Then you will be able to tap to back button (which is set by default) in UINavigationBar which gets you to previous UIViewController
I currently have parental "menu" TableView with UINavigationBar and from each cell there is a segues by reference outlet to 3 similar Views with different information.
In each View there is a buttons to other 2 Views.
With every button's segue opens another View.
The problem:
From every View UINavigationBar's back button returns me to previous View but i tries to make back button to "menu".
Additional Bar Button Item and segue from it makes very close effect but segue animation is not like in UINavigationController.
How I could clean UINavigationBar transitions history in segue to initial View?
You can try pop to root view controller or You can edit navigation controller viewControllers property and remove/add some VC in between.
You can try Unwind Segue mechanism too.
Here are some methods(function) that navigation controller providing for pop operations. They are returning optional UIViewController (intance) from it’s navigation stack, that is popped.
open func popViewController(animated: Bool) -> UIViewController? // Returns the popped controller.
open func popToViewController(_ viewController: UIViewController, animated: Bool) -> [UIViewController]? // Pops view controllers until the one specified is on top. Returns the popped controllers.
open func popToRootViewController(animated: Bool) -> [UIViewController]?
Here is sample code as a solution to your query::
// if you want to back to root of your app
if let rootNavigationController = self.window?.rootViewController as? UINavigationController {
rootNavigationController.popToRootViewControllerAnimated(true)
}
// But if you want to back to root of your current navigation
if let viewcontroller = self.storyboard?.instantiateViewController(withIdentifier: "NewViewController") as? NewViewController { // or instantiate view controller using any other method
viewcontroller.navigationController?.popToRootViewControllerAnimated(true)
}
I have two view controllers, I added navigation bar to second view controller with two bar button items Back and Item as shown below
But when I do a push segue from first view controller, it is replaced by navigation item <Category, which is title of navigation item in my first view controller as shown below
How do I keep my navigation bar intact avoiding the default navigation item <Category, which is being added automatically while maintaining push segue functionality.
I tried to do maually without using stoyboard as follows
#IBAction func plusAction(_ sender: Any) {
let secondViewController = self.storyboard?.instantiateViewController(withIdentifier: "SVC") as? SecondViewController
self.navigationController?.pushViewController(secondViewController!, animated: true)
}
but it still doesnt work.
You want to display two bar button items Back and Item by added UINavigationBar to second view controller, you are doing it in the wrong way!!!
In your storyboard, drag a UINavigationItem to your second ViewController.
If the UINavigationItem does not display on your storyboard, you must select second view controller, choose Opaque Navigation Bar or Translucent Navigation Bar (not important)
After that, you can drag UIBarButtonItem where you want on your ViewController
Have you tried changing the kind of segue through segue inspector (click the particular segue and check its attributes in the inspector) like this,
But you should know each one of it is not similar, has it's own definition in how it appears - check https://developer.apple.com/library/content/featuredarticles/ViewControllerPGforiPhoneOS/UsingSegues.html
Also, alternatively using code,
if let viewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "storyboardId") as? TargetViewController {
self.present(viewController, animated: false, completion: nil)
}
I have created a simple tab bar with three views in storyboard. The tab bar works well, but when I try to show another view controller from a button within a tab, the new view is placed over the whole screen and also over the tab bar.
This is how I present the view so far when a button is pressed:
#IBAction func buttonPressed(_ sender: UIButton) {
let newVC = self.storyboard?.instantiateViewController(withIdentifier: "extraVC")
self.present(newVC!, animated: true, completion: nil)
}
The other idea I had was this:
self.tabBarController?.present(vc!, animated: true, completion: nil)
But this didn't work either.
So how can I present another view controller within the tab bar (so that the bottom bar is still shown)?
When you present a view controller modally, its presentation style will be "Full Screen" by default. What you want to do is have it do in this case is just cover part of the screen (the part where the presenting view controller is drawn.
One way to accomplish this is to:
Set the modalPresentationStyle for the presented view controller to be .currentContext or .overCurrentContext
In the view controller that will be presenting the modal, set its definesContext property to true.
These steps can be done either in Interface Builder by setting attributes on the segue and the view controller, or you can modify your code to include the following:
#IBAction func buttonPressed(_ sender: UIButton) {
let newVC = self.storyboard?.instantiateViewController(withIdentifier: "extraVC")
self.definesPresentationContext = true
newVC?.modalPresentationStyle = .overCurrentContext
self.present(newVC!, animated: true, completion: nil)
}
What this combination of properties does is:
Indicate for the presented view controller that you want it to be presented in a non-full screen context (some specific section of the screen)
Indicate that the presenting view controller is in the section of the screen / the context you want the modal to be drawn according to.
More details can be found in the Apple Documentation
When you are using present method, the ViewController is presented modally and covers your UITabBarConntroller. Instead of showing your view modally you can embed every first view controller in your TabBar into UINavigationController and then use method pushViewController to push it onto stack. You will have your TabBar visible and nice looking animation for free.
In Xcode, I created a new project using the Tabbed App template to illustrate the solution above. This will create a project with a tabbar controller and two view controllers. I added a button with the title "view page" to the first view controller and embedded a navigation controller from the storyboard.
The storyboard will look like this after making the above changes:
In the FirstViewController.swift file, I created an IBAction for the button with the following code that will create another view controller called DetailViewController, with the title Favorites and a background color of orange. I used the navigation controller to present it by pushing it onto the navigation controller stack.
#IBAction func viewPageButtonTapped(_ sender: UIButton) {
print("viewPageButtonTapped")
let pinkViewController = DetailViewController()
pinkViewController.title = "Favorites"
pinkViewController.view.backgroundColor = UIColor.orange
navigationController?.pushViewController(pinkViewController, animated: true)
}
When I run the project on the simulator, I got the desired result. Hope this helps give you some ideas.
In your viewController do:
self.tabBarController?.present(nextViewController, animated: true/false, completion: {})
I have this situation :
I have a first view controller , when tap on button in it I open in modal mode another view controller , in this view controller when I tap another button I open in modal view another view controller and in it there is a button and when I tap on it I want to go to first view controller without re-initialize it.
How do I do it?
This is the perfect situation for an unwind segue.
Put this in your first viewController (the one you want to return to):
#IBAction func backFromVC3(_ segue: UIStoryboardSegue) {
print("We are back in VC1!")
}
Then in the Storyboard in your 3rd viewController, control-drag from your button to the exit icon at the top of the viewController and choose backFromVC3 from the pop-up.
Now, when the user presses the button in VC3, both VC3 and VC2 will be dismissed and you will return to VC1.
If you are not using Storyboards, you can dismiss the viewControllers with code. Here is code for a button's handler to dismiss two levels of viewController:
func doDismiss(_ sender: UIButton) {
// Use presentingViewController twice to go back two levels and call
// dismissViewController to dismiss both viewControllers.
self.presentingViewController?.presentingViewController?.dismiss(animated: true, completion: nil)
}
Thanks all for reply and edited my question :)
I found 2 line code to resolved my problem:
let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
appDelegate.window!.rootViewController?.dismissViewControllerAnimated(true, completion: nil).
And that work well.
Thanks very much