Hi I've been trying to change my back button in my application's navigation bar. The problem is that I see the change when I load the view twice.
I've searched for the answer several times but I don't see what I really want. In fact, I'm new at this language so it's difficult.
What I tried is putting the following lines in the viewWillAppear method and others*:
nav?.navigationBar.backItem?.title = "Messages"
The result is that when I enter the view I see the back button's title as Back. Then if I press on that button and enter the view again the title changes as I want. On the other hand, what I want is to change the title when I load the view first.
*-> I've tried the same line in viewDidLoad too see if that does anything and in viewWillDisappear of the previous view, but nothing happens.
You are using method a change back button in your current ViewController it is wrong, because your navigationBar configured in past controller. If you use Storyboard, please will try this method in your parent controller:
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
let backItem = UIBarButtonItem()
backItem.title = "Messages"
navigationItem.backBarButtonItem = backItem
}
If you init newController in your parentController, you must to modify your a backButton in parentController, example:
// It's action for any button witch present your newController
#objc private func presentDetailViewContorller() {
let weatherDetailController = WeatherDetailController()
let navController = NavigationController(rootViewController: weatherDetailController)
let backItem = UIBarButtonItem()
backItem.title = "Messages"
navController.backBarButtonItem = backItem
self.present(navController, animated: true, completion: nil)
}
Good luck!
Related
I have a project with a UITabBarController and a couple of views. Sort of like this:
In this project, the tab bar controller is called by tapping the Tab button on the UIViewController. I would like to get rid of the back button with "Title", and replace it with an "X" icon. When tapped, the "X" icon would dismiss the UITabBarController and return to the caller. I do this all of the time on UINavigationController using a UINavigationItem, but that does not appear to work in this situation. I drag the UINavigationItem to the view and it allows it, but it does not show up on the view and any UIBarButtonItem that I drag and drop on it do not appear.
Is there a way to actually do this? I'd even be ok with leaving the existing back button as it is and just getting rid of "Title"
I figured it out right after posting the question. Just a bit more research is all it took.
To fix this, add the following to the UITabBarController code.
override func viewDidLoad() {
super.viewDidLoad()
let buttonImage = UIImage(named: "back")
let leftButton = UIBarButtonItem(image: UIImage(named: "back"), style: .plain, target: self, action: #selector(dismissTabBar))
leftButton.tintColor = UIColor.black
self.navigationItem.leftBarButtonItem = leftButton
}
#IBAction func dismissTabBar() {
self.navigationController?.popToRootViewController(animated: true)
}
This gives me a black back button with my image. When I tap it, it brings me back to the calling 'UIViewController.
In the below figure, I have a "Back" button in the nav bar which I would want for it to close the Barcode Scanner tab and bring me to to the view I was prior to hitting the "Back button. How would that be possible?
Your request is improper UI. Tabs should not contain back button for going to previous tab, and I really hope that 'Close' the tab doesn't mean you want to remove it.
Other than that you can change active tab UITabBar.setSelectedItem. But really in your case don't do it.
View controllers that you load are all stacked in order of you viewing them. To go back to your previous view simply dismiss the last view controller. You can use this code:
#IBAction func backButtonPressed(_ sender: UIBarButtonItem) {
dismiss(animated: true, completion: nil)
}
Hopefully this should do the trick.
you can override back button in ViewDidLoad like :
override func viewDidLoad() {
super.viewDidLoad()
navigationItem.leftBarButtonItem = UIBarButtonItem(title: "Back", style: .plain, target: self, action: #selector(self.back(_:)))
}
func back(_ sender: AnyObject) {
//if you want to go to previous view use this code
self.navigationController?.popViewController(animated: true)
//if you want to go to a tab bar view use this code
//index of your tab bar
tabBarController?.selectedIndex = 1
}
Hi I am looking to make a pop out table view similar to the one below and with selectable cells. Any help would be great thanks!
Here is what I would like to style it after
You will want to make use of UIPopoverPresentationController.
Make a tableviewController with the data you want to be able to select
Make a button that will send the action so you can present the popover
Do something with the item selected from the popover.
The second item above looks something like this (my own code example):
#IBAction func shareAction(_ sender: UIButton) {
let controller = ShareVC()
controller.socialPost = self.item
controller.modalPresentationStyle = .popover
// configure the Popover presentation controller
let popController: UIPopoverPresentationController? = controller.popoverPresentationController
popController?.permittedArrowDirections = [.up, .down]
popController?.delegate = self
// in case we don't have a bar button as reference
popController?.sourceView = sender
popController?.sourceRect = sender.frame
popController?.backgroundColor = .white
self.parentViewController?.present(controller, animated: true, completion: { })
}
In my case the 'ShareVC" is a UITableViewController with item sharing options. Pretty similar to your screenshot as far as layout goes.
This will present that popover from the button that was tapped. Then again, you just need to handle the selection of the items from that ViewController.
I have a view controller with a toolbar with 3 UIButtons that open a new view controller as a popover. I created the segues in Storyboard and selected "Present as Popover". The popovers work but when the user taps on another button while a popover is currently open, I get this error:
Warning: Attempt to present <Fingerpainter.OpacityViewController: 0x79095110> on <Fingerpainter.DrawingViewController: 0x7b278000> which is already presenting <Fingerpainter.BrushSizeViewController: 0x79573770>
Is there a way to like make sure all popovers are closed before opening a new one? Here's my prepareForSegue method in the main ViewController (containing the toolbar):
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
let identifier = segue.identifier ?? ""
let popoverPresentationController = segue.destinationViewController.popoverPresentationController
popoverPresentationController!.delegate = self
switch identifier {
case Storyboard.BrushSizeSegueIdentifier:
if let brushSizeViewController = popoverPresentationController?.presentedViewController as? BrushSizeViewController {
// set properties in brushSizeViewController
}
case Storyboard.OpacitySegueIdentifier:
if let opacityViewController = popoverPresentationController?.presentedViewController as? OpacityViewController {
//set properties in opacityViewController
}
case Storyboard.ColorSegueIdentity:
if let colorViewController = popoverPresentationController?.presentedViewController as? ColorViewController {
//set properties in colorViewController
}
default:
break
}
}
Is there a way to like make sure all popovers are closed before opening a new one
It's the other way around. It's your job to make sure that while the popover is present, a button that summons another popover is not tappable. You can do this by disabling the button, but more commonly, in order to coordinate the disabling of the button with the presence of the popover, it's done by adjusting the popover presentation controller's passthroughViews.
Unfortunately there's a massive and long-standing bug where even setting the passthroughViews to nil doesn't prevent toolbar buttons from being tappable. The workaround is to do it with a delay. A lot of my popover code adds this sort of thing:
if let pop = popoverPresentationController {
delay(0.1) {
pop.passthroughViews = nil
}
}
(where delay is described here: https://stackoverflow.com/a/24318861/341994).
I would like to seque programmatically to a "setup-VC" when the initial setup is not done. This works, BUT in this case I don't want to show the back button on the "setup-VC".
What I've done till now:
I've created two VC. (main-VC and setup-VC)
The code of main-VC:
...
if InitialSetupIsDone == true {
println("Loading the data...") //PPP
} else {
println("Segue to setup screen...") //PPP
self.performSegueWithIdentifier("segueToSetup", sender: self)
}
...
// Pull any data from the view controller which initiated the unwind segue.
#IBAction func segueToSetup(sender: UIStoryboardSegue)
{
let sourceViewController: AnyObject = sender.sourceViewController
}
In the main-VC I've created an unwind-segue ("EXIT"-action? - red icon at the top of the VC) and named it "segueToSetup".
At last point I've connected the "setup-VC" with the "main-VC" while dragging an segue from main-VC (yellow Icon top left) to the setup VC.
Then it would look like this:
(The upper connection goes directly from setup sign to the "setup-VC")
The goal for me now would be to kind of "hide" the back button in "setup-VC" while the initial setup is not done. Maybe I've don't create the unwind segue right... !? Thx
Write this line in destination VC viewDidLoad
navigationController?.navigationItem.setHidesBackButton(true, animated: true)
In viewWillAppaer method also write this
navigationController?.navigationItem.setHidesBackButton(true, animated: true)
This disabled the button for me:
let backButton = UIBarButtonItem(title: "", style: UIBarButtonItemStyle.Plain, target: navigationController, action: nil)
navigationItem.leftBarButtonItem = backButton