Change size of UIBarButtonItem (image) in Swift 3

Question

I am trying to change the size of some icons in my navBar, but I am a little confused as to how to do this? My code so far is:

func setUpNavBarButtons() {
    let moreButton = UIBarButtonItem (image: UIImage(named:"ic_more_vert_3")?.withRenderingMode(.alwaysOriginal), style: .plain, target: self, action: #selector(handleMore))
    navigationItem.rightBarButtonItems = [moreButton]
    let refreshButton = UIBarButtonItem (image: UIImage(named:"ic_refresh")?.withRenderingMode(.alwaysOriginal), style: .plain, target: self, action: #selector(refreshDataButton))
    navigationItem.leftBarButtonItems = [refreshButton]
}

any help?

Answer 1

Extension for Swift 4.2

Just a different way of implementation the answer provided by anoop4real

However using button type .system allows the global tint to be applied to your icon

Usage:

navigationItem.leftBarButtonItem = UIBarButtonItem.menuButton(self, action: #selector(presentSettings), imageName: "settings")

Implementation:

extension UIBarButtonItem {

    static func menuButton(_ target: Any?, action: Selector, imageName: String) -> UIBarButtonItem {
        let button = UIButton(type: .system)
        button.setImage(UIImage(named: imageName), for: .normal)
        button.addTarget(target, action: action, for: .touchUpInside)

        let menuBarItem = UIBarButtonItem(customView: button)
        menuBarItem.customView?.translatesAutoresizingMaskIntoConstraints = false
        menuBarItem.customView?.heightAnchor.constraint(equalToConstant: 24).isActive = true
        menuBarItem.customView?.widthAnchor.constraint(equalToConstant: 24).isActive = true

        return menuBarItem
    }
}

Answer 2

This is how I did it

iOS 10 and below

func setUpMenuButton(){
    let menuBtn = UIButton(type: .custom)
    menuBtn.frame = CGRect(x: 0.0, y: 0.0, width: 20, height: 20)
    menuBtn.setImage(UIImage(named:"menuIcon"), for: .normal)
    menuBtn.addTarget(self, action: #selector(vc.onMenuButtonPressed(_:)), for: UIControlEvents.touchUpInside)

    let menuBarItem = UIBarButtonItem(customView: menuBtn)
    self.navigationItem.leftBarButtonItem = menuBarItem
}

iOS 11 - Navigation bar come up with Autolayout so frame setting may not work

func setUpMenuButton(){
    let menuBtn = UIButton(type: .custom)
    menuBtn.frame = CGRect(x: 0.0, y: 0.0, width: 20, height: 20)
    menuBtn.setImage(UIImage(named:"menuIcon"), for: .normal)
    menuBtn.addTarget(self, action: #selector(vc.onMenuButtonPressed(_:)), for: UIControlEvents.touchUpInside)

    let menuBarItem = UIBarButtonItem(customView: menuBtn)
    let currWidth = menuBarItem.customView?.widthAnchor.constraint(equalToConstant: 24)
    currWidth?.isActive = true
    let currHeight = menuBarItem.customView?.heightAnchor.constraint(equalToConstant: 24)
    currHeight?.isActive = true
    self.navigationItem.leftBarButtonItem = menuBarItem
}

Answer 3

You can configure the frame of you button like below:

let icon = UIImage(named: "imageName")
let iconSize = CGRect(origin: CGPoint.zero, size: CGSize(width: 50, height: 50))
let iconButton = UIButton(frame: iconSize)
iconButton.setBackgroundImage(icon, for: .normal)
let barButton = UIBarButtonItem(customView: iconButton)
iconButton.addTarget(self, action: #selector(foo), for: .touchUpInside)

navigationItem.leftBarButtonItem = barButton

Answer 4

@DogCoffee answer is a great and creative way to solve the problem. May I suggest some slightly mods in order to take into account size and tintColor

extension UIBarButtonItem {

    static func menuButton(_ target: Any?,
                           action: Selector,
                           imageName: String,
                           size:CGSize = CGSize(width: 32, height: 32),
                           tintColor:UIColor?) -> UIBarButtonItem
    {
        let button = UIButton(type: .system)
        button.tintColor = tintColor
        button.setImage(UIImage(named: imageName), for: .normal)
        button.addTarget(target, action: action, for: .touchUpInside)

        let menuBarItem = UIBarButtonItem(customView: button)
        menuBarItem.customView?.translatesAutoresizingMaskIntoConstraints = false
        menuBarItem.customView?.heightAnchor.constraint(equalToConstant: size.height).isActive = true
        menuBarItem.customView?.widthAnchor.constraint(equalToConstant: size.width).isActive = true

        return menuBarItem
    }
}