Changing Nav Bar Item Programmatically in Swift

changing nav bar item programmatically in Swift

The following code should work:

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        let refreshButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Refresh, target: self, action: "buttonMethod")
        navigationItem.leftBarButtonItem = refreshButton

        navigationController?.navigationBar.barTintColor = UIColor.greenColor()
        title = "Search result"
    }

    func buttonMethod() {
        print("Perform action")
    }

}

If you really need to perform it in viewWillAppear:, here is the code:

import UIKit

class ViewController: UIViewController {

    var isLoaded = false

    override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated)

        if !isLoaded {
            let refreshButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Refresh, target: self, action: "buttonMethod")
            navigationItem.leftBarButtonItem = refreshButton
            isLoaded = true

            navigationController?.navigationBar.barTintColor = UIColor.greenColor()
            title = "Search result"
        }
    }

    func buttonMethod() {
        print("Perform action")
    }

}

You can learn more about the navigationItem properties with this previous question.

Changing navigation title programmatically

You change the title by changing the title of the view controller being displayed:

viewController.title = "some title"

Normally this is done in view did load on the view controller:

override func viewDidLoad() {
    super.viewDidLoad()
    self.title = "some title"
}

However, this only works if you have your view controller embedded in a UINavigationController. I highly recommend doing this instead of creating a navigation bar yourself. If you insist on creating a navigation bar yourself, you can change the title by doing:

navigationBar.topItem.title = "some title"

How do i change properties of a navigation bar item programmatically?

Use below code to set title attributes in viewDidLoad().

       navigationController?.navigationBar.titleTextAttributes = [.foregroundColor : UIColor.white,
                                                          .font: UIFont.systemFont(ofSize: 16)]

Create NavBar programmatically with Button and Title Swift

Updated for Swift 5

Create a navigation item instance and set title and right/left buttons to it. After navigation item is configured add it to the navigation bar.

let navBar = UINavigationBar(frame: CGRect(x: 0, y: 0, width: view.frame.size.width, height: 44))
view.addSubview(navBar)

let navItem = UINavigationItem(title: "SomeTitle")
let doneItem = UIBarButtonItem(barButtonSystemItem: .done, target: nil, action: #selector(selectorName:))
navItem.rightBarButtonItem = doneItem

navBar.setItems([navItem], animated: false)

Changing Nav Bar title programmatically

self.navigationController.navigationBar.topItem.title = @"YourTitle";

Change bar button item programmatically after user presses it Swift

Add an action for UIBarButtonItem on your UIViewController class by control dragging it into the ViewController's declaration. Then change the item

@IBAction func barButtonAction(_ sender: UIBarButtonItem) {
    sender.image = UIImage(named: "myNewImage")
}

UIBarButtonItem in navigation bar programmatically?

Custom button image without setting button frame:

You can use init(image: UIImage?, style: UIBarButtonItemStyle, target: Any?, action: Selector?) to initializes a new item using the specified image and other properties.

let button1 = UIBarButtonItem(image: UIImage(named: "imagename"), style: .plain, target: self, action: Selector("action")) // action:#selector(Class.MethodName) for swift 3
self.navigationItem.rightBarButtonItem  = button1

Check this Apple Doc. reference

---

UIBarButtonItem with custom button image using button frame

FOR Swift 3.0

    let btn1 = UIButton(type: .custom)
    btn1.setImage(UIImage(named: "imagename"), for: .normal)
    btn1.frame = CGRect(x: 0, y: 0, width: 30, height: 30)
    btn1.addTarget(self, action: #selector(Class.Methodname), for: .touchUpInside)
    let item1 = UIBarButtonItem(customView: btn1)

    let btn2 = UIButton(type: .custom)
    btn2.setImage(UIImage(named: "imagename"), for: .normal)
    btn2.frame = CGRect(x: 0, y: 0, width: 30, height: 30)
    btn2.addTarget(self, action: #selector(Class.MethodName), for: .touchUpInside)
    let item2 = UIBarButtonItem(customView: btn2)  

    self.navigationItem.setRightBarButtonItems([item1,item2], animated: true)

---

FOR Swift 2.0 and older

let btnName = UIButton()
btnName.setImage(UIImage(named: "imagename"), forState: .Normal)
btnName.frame = CGRectMake(0, 0, 30, 30)
btnName.addTarget(self, action: Selector("action"), forControlEvents: .TouchUpInside)

//.... Set Right/Left Bar Button item
let rightBarButton = UIBarButtonItem()
rightBarButton.customView = btnName
self.navigationItem.rightBarButtonItem = rightBarButton

Or simply use init(customView:) like

 let rightBarButton = UIBarButtonItem(customView: btnName)
 self.navigationItem.rightBarButtonItem = rightBarButton

---

For System UIBarButtonItem

let camera = UIBarButtonItem(barButtonSystemItem: .Camera, target: self, action: Selector("btnOpenCamera"))
self.navigationItem.rightBarButtonItem = camera

---

For set more then 1 items use rightBarButtonItems or for left side leftBarButtonItems

let btn1 = UIButton()
btn1.setImage(UIImage(named: "img1"), forState: .Normal)
btn1.frame = CGRectMake(0, 0, 30, 30)
btn1.addTarget(self, action: Selector("action1:"), forControlEvents: .TouchUpInside)
let item1 = UIBarButtonItem()
item1.customView = btn1

let btn2 = UIButton()
btn2.setImage(UIImage(named: "img2"), forState: .Normal)
btn2.frame = CGRectMake(0, 0, 30, 30)
btn2.addTarget(self, action: Selector("action2:"), forControlEvents: .TouchUpInside)
let item2 = UIBarButtonItem()
item2.customView = btn2

self.navigationItem.rightBarButtonItems = [item1,item2]

Using setLeftBarButtonItem or setRightBarButtonItem

let btn1 = UIButton()
btn1.setImage(UIImage(named: "img1"), forState: .Normal)
btn1.frame = CGRectMake(0, 0, 30, 30)
btn1.addTarget(self, action: Selector("action1:"), forControlEvents: .TouchUpInside)
self.navigationItem.setLeftBarButtonItem(UIBarButtonItem(customView: btn1), animated: true);

For swift >= 2.2 action should be #selector(Class.MethodName) ... for e.g. btnName.addTarget(self, action: #selector(Class.MethodName), forControlEvents: .TouchUpInside)

How can I add a navigation bar programmatically that actually fits the screen?

you just need to set translatesAutoresizingMaskIntoConstraints to false and all will be ok. You need this because you add constraints to your view on your own. If you don't do that than you must handle navbar width on your own when phone changes orientation ( viewWillTransition()... ).

Also if this is set to true and you add your own constraints you will probably get some conflicts.

So, do this:

let myNav = UINavigationBar(frame: CGRect.zero)
myNav.translatesAutoresizingMaskIntoConstraints = false

also you don't need to set width of navbar because you use constraints. You just set it CGRect.zero

You can read more about translatesAutoresizingMaskIntoConstraints here

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