如何手动触发 UIBarButtonItem 点击事件？

Question

I have a situation where I have a custom UIButton that is a subview of a UIBarButtonItem:

guard let tab1 = self.tabBar.items![0].value(forKey: "view") as? UIView else {return}

    let button2Test = UIButton()
    tab1.addSubview(button2Test)

The custom UIButton, has a target:

button2Test.addTarget(self, action: #selector(buttonTouchUpInsideP3), for: [.touchUpInside])
button2Test.addTarget(self, action: #selector(buttonTouchInsideBoundsP3), for: [.touchDown, .touchDragEnter])
button2Test.addTarget(self, action: #selector(buttonDraggedOutOfBoundsP3), for: [.touchDragExit, .touchCancel])

Basically, in the buttonTouchUpInsideP3 function, I want to programmatically / manually make the UIBarButtonItem at a specific index to fire as if it was tapped on , since the target of the UIButton does not allow the actual UIBarButtonItem underneath to be tapped, unfortunately...

My attempt which did not work because of errors is: (which I got from an outdated Q ). Note that I call this in the buttonTouchUpInsideP3 target function which ones once you've let go of the button.

let homeTabBarItem = self.tabBar.items![0]
UIApplication.sharedApplication.sendAction(homeTabBarItem.action, to: homeTabBarItem.target, from: nil, forEvent: nil)

Answer 1

You can just set the UIBarButtonItem's target and action properties directly.

Answer 2

I figured out how to do it:

tabBarController.selectedIndex = 0

Just put this in the buttonTouchUpInside function; ;)

You should probably also call:

self.tabBar(self.tabBar, didSelect: self.tabBar.items![0])