appearance().setBackgroundImage Not Working On Custom Class - swift

Question

I have created a UIBarButtonItem custom class and assigned one bar button item with this class in the storyboard.
In the app delegate I'm trying to set the appearance for it using:
VIPButton.appearance().setBackgroundImage(UIImage(named: "vipButton"), for: .normal, barMetrics: .default)
However while this works for regular UIBarButtonItems it has no affect for my custom class bar button item.
Any help would be appreciated.

Answer 1

create custom class from UIButton:
public class SimpleButton: UIButton {
#objc dynamic var backColor: UIColor? {
didSet {
self.backgroundColor = self.backColor
}
}
#objc dynamic var image: UIImage? {
didSet {
self.setImage(self.image, for: .normal)
}
}
}
Next you create a class from UIBarButtomItem.
now set customView property to SimpleButon for custom Appearance and set action for this like below:
public class SimpleBarButton: UIBarButtonItem {
// create object from simpleButton
private let button = SimpleButton()
public required init?(coder: NSCoder) {
super.init(coder: coder)
// add target for button
self.button.addTarget(self, action: #selector(self.buttonTapped(_:)), for: .touchUpInside)
// set title
self.button.setTitle("title", for: .normal)
self.button.sizeToFit()
// assing simple button to customView property
self.customView = self.button
}
// get callback from touchUp button
#objc func buttonTapped(_ sender: UIButton) {
// here set callback for tapped on BarButtonItem
// check target and action is not Nil
guard let target = self.target, let action = self.action else {
return
}
// call selector (implement to your ViewController)
// pass self for parameters
target.performSelector(inBackground: action, with: self)
}
}
I created a class in this section and assigned a button to the customView variable.
Now I add style to SimpleButton like this:
SimpleButton.appearance().backColor = .red
SimpleButton.appearance().image = UIImage.init(named: "images")!
now for create BarButtonItem on storyboard and change custom class to SimpleBarButton:
now create ViewController and add action for event barButton:
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
}
#IBAction func sampleClicked(_ sender: SimpleBarButton) {
print("callBack from action on BarButton Item")
}
}
and assign this function to BarButton:
UI output: