How to click a button programmatically?

Question

I have 2 view controllers which should be swapped according to userinput. So, I want to switch the views programatically based on the input I get from a text file.

Answer 1

To fire an event programmatically you need to call sendActionsForControlEvent

button.sendActionsForControlEvents(.TouchUpInside)

--

Swift 3

button.sendActions(for: .touchUpInside)

Answer 2

Or you can just put all the logic that you perform when a button gets clicked in a separate method, and call that method from your button's selector method.

@IBAction func someButtonPressed(button: UIButton) {
    pushViewControllerOne()
}

@IBAction func someButtonPressed(button: UIButton) {
    pushViewControllerTwo()
}

func pushViewControllerOne() {
    let viewController = ViewControllerOne(nibName: "ViewControllerOne", bundle: nil)
    pushViewController(viewController)
}

func pushViewControllerTwo() {
    let viewController = ViewControllerOne(nibName: "ViewControllerTwo", bundle: nil)
    pushViewController(viewController)
}

func pushViewController(viewController: UIViewController) {
    navigationController?.pushViewController(viewController, animated: true)
}

Then instead of invoking programatically invoking a button press, just call the method pushViewControllerOne() or pushViewControllerTwo()