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
Related
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!
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
}
I'm trying to pass a trigger between 2 view controller but i can't find something that works ...
I have the main controller with a NSTableView, source linked, View Base.
main Controller class :
class ViewController: NSViewController {
I have an array defined in Global variables.
on the viewDidLoad i add 2 elements in my array, then i use setDelegate and setDataSource.
It works fine.
myLib.myCoins = fillCoinsTable()
print ("My lib has \(myLib.myCoins.count) objects ")
mainCoinTable.setDelegate(self)
mainCoinTable.setDataSource(self)
I have a segue from the WINDOWS CONTROLLER to my second view Controller.
(It's a ToolBar button). The segue is "Sheet" kind.
This second controller allows me to add an element in my global variable arrays, with a button "Save" .
Code on the second controller
#IBAction func addCoinButton(sender: AnyObject) {
//We add the coin
let newCoin:coin = coin(n: textName.stringValue)
newCoin.Year = Int.init(textYear.stringValue)
myLib.myCoins.append(newCoin)
self.dismissController(self)
}
If i add a button on the main controller, to reloadData on the TableView, it works fine. The third element is added.
but i would like that to be automatic ....
I tried segue, but mine is not between view controller but with the windows controller.
Can you please help ?
Thanks,
Nicolas
I think, you want to add data from oneViewController and without pressing button, you want after navigation or pressing back button, you want to reload automatically tableview to show updated results, right.
If I'm not wrong then, this solution will work for you.
Follow this below steps:
Step 1 :
Add this code in your view controller, from which you want to add data in array or in database, instead of button click.
override func viewDidLoad()
{
super.viewDidLoad()
let backItem = UIBarButtonItem(title: "Back", style: .Plain, target: self, action: "goBack")
self.navigationItem.leftBarButtonItem = backItem
}
func goBack()
{
NSNotificationCenter.defaultCenter().postNotificationName("load", object: nil)
self.navigationController?.popViewControllerAnimated(true)
}
Step 2:
Now its final step.
Now add this below code, to your result view controller, where you want to automatically update the result.
func loadList(notification: NSNotification){
self.TableView.reloadData()
}
override func viewWillAppear(animated: Bool) {
NSNotificationCenter.defaultCenter().addObserver(self, selector: "loadList:",name:"load", object: nil)
}
Now implement this code-stuff in your coding. Hope it works for you.
If you want the table to reload automatically when the View appears add this to viewWillAppear
self.tableView.performSelectorOnMainThread(#selector(UITableView.reloadData), withObject: nil, waitUntilDone: true)
I am adding some subview to main view controller. When I add one of these subview, I create a custom back button so that it will go back to main view controller, not the prior view controller in the navigation stack. I can add it programmatically but I can't seem to figure out how to delete it. Any help is greatly appreciated!
func createCustomBackButton() {
self.navigationItem.hidesBackButton = true
let customFont = UIFont.systemFontOfSize(26.0)
UIBarButtonItem.appearance().setTitleTextAttributes([NSFontAttributeName: customFont], forState: UIControlState.Normal)
// customBackButton is a property I set for UIBarButtonItem
customBackButton = UIBarButtonItem(title: "<", style: .Plain, target: self, action: "back:")
self.navigationItem.leftBarButtonItem = customBackButton
}
func back(sender: UIBarButtonItem) {
UIView.animateWithDuration(0.3, animations: {
self.containerView.alpha = 0
}, completion: { finished in
self.view.sendSubviewToBack(self.containerView)
self.navigationItem.hidesBackButton = false
// what do I do on this line to get this to disappear or set to nil??
self.customBackButton = UIBarButtonItem(title: "", style: UIBarButtonItemStyle.z, target: self, action: nil)
// clears out prior view that was there to free up memory
for view in self.containerView.subviews {
view.removeFromSuperview()
}
})
}
Using self.navigationItem.leftBarButtonItem = nil will reset the leftBarButtonItem back to the default.
You should use an unwind segue. If you're using storyboards, drag from the "destination viewcontroller" to the thing that looks like a sideways share button (exit button) of the VC you want unwind from. Name it whatever you'd like, we'll call it "unwind"
and then call in the same VC:
self.performSegueWithIdentifier("unwind", sender: self)
in the VC you want to unwind back to:
#IBAction func unwindToMapSegue(segue: UIStoryboardSegue) {
// do something
}