I have a MainViewController embed in a Navigation Controller, as shown below:
And in MainViewController.swift, I added two UIBarButtonItem(left and right) programmatically:
class MainViewController: UIViewController {
let rightButton = UIBarButtonItem(title: "Right", style: .plain, target: self, action: #selector(onRightClick))
let leftButton = UIBarButtonItem(title: "Left", style: .plain, target: self, action: #selector(onLeftClick))
override func viewDidLoad() {
super.viewDidLoad()
navigationItem.rightBarButtonItem = rightButton
navigationItem.leftBarButtonItem = leftButton
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
@objc func onRightClick() {
print("[Main] Right Click")
}
@objc func onLeftClick() {
print("[Main] Left Click")
}
}
The buttons did show on the screen, but the interesting thing is, the selector functions onLeftClick
and onRightClick
never get called whenever I pressed left or right button. Is there anything I should do to make it works? I am using Xcode 9.3.
try with inside scope once
override func viewDidLoad() {
super.viewDidLoad()
let rightButton = UIBarButtonItem(title: "Right", style: .plain, target: self, action: #selector(self.onRightLeftClick(_ :)))
rightButton.tag = 1
let leftButton = UIBarButtonItem(title: "Left", style: .plain, target: self, action: #selector(self.onRightLeftClick(_ :)))
rightButton.tag = 2
self.navigationItem.rightBarButtonItem = rightButton
self.navigationItem.leftBarButtonItem = leftButton
}
handle the action as
func onRightLeftClick(_ sender: UIBarButtonItem){
if sender.tag == 1{
// rightButton action
}else{
// leftButton action
}
}