How put UIBarButtonItem on ViewController of NavigationController on Swift4? - ios

Question

I've a three screens for navigate. But in one these, I can't put a UIBarButtoItem. This screen, is for create a register, and I wants create a button to "Save", that simple. When I did, I select the Bar Button Item, the XCode do not leave me drop on the bar. And programatically, also not works.
I tried this: (Not happens)
var btSalvar : UIBarButtonItem?
override func viewDidLoad() {
super.viewDidLoad()
btSalvar = UIBarButtonItem(title: "Salver", style: .plain, target: self, action: nil)
self.navigationItem.rightBarButtonItem = btSalvar
// Do any additional setup after loading the view.
}
And in storyboard: (Note: The Button "Item" not keep fixed on the bar)

Answer 1

You have many options to do that, One of them is:
You have to create a super view controller and add navigation button code in it. I have added a back button for a demo:
class MainViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
}
/**
To add the left back button on navigation.
*/
var addLeftBarMenuButtonEnabled: Bool? {
didSet {
if addLeftBarMenuButtonEnabled! {
let leftBarBtn = UIButton()
leftBarBtn.setImage(UIImage(named: "backIcon"), for: .normal)
leftBarBtn.frame = CGRect(x: 0, y: 0, width: 30, height: 30)
leftBarBtn.addTarget(self, action: #selector(actionBackButton), for: .touchUpInside)
self.navigationItem.leftBarButtonItem = UIBarButtonItem.init(customView: leftBarBtn)
} else {
self.navigationItem.setHidesBackButton(true, animated: true)
}
}
}
///This is action method for back button
#objc func actionBackButton() {
self.view.endEditing(true)
self.navigationController?.popViewController(animated: true)
}
}
Now you need to use the back button in your view controller which super view controller is MainViewController:
class ViewController: MainViewController {
override func viewDidLoad() {
super.viewDidLoad()
self.addLeftBarMenuButtonEnabled = true
}
}
You can add navigation button like that and use where you want. If you want to use it in every view controller then you have to add 'self.addLeftBarMenuButtonEnabled = true' in main view controller like that
class MainViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
self.addLeftBarMenuButtonEnabled = true
}
}