Make a UIButton programmatically in Swift

Question

I am trying to build UI\'s programmatically. How do I get this action working? I am developing with Swift.

Code in viewDidLoad:

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Answer 1

For Swift 3 Xcode 8.......

let button = UIButton(frame: CGRect(x: 0, y: 0, width: container.width, height: container.height))
        button.addTarget(self, action: #selector(self.barItemTapped), for: .touchUpInside)


func barItemTapped(sender : UIButton) {
    //Write button action here
}