How do I add a IBAction to a button programmatically in Swift 4?

Question

How do I add a IBAction to a button programmatically?

button.addTarget(self, action: Selector(("buttonAction:")), for: 
.touchUpInside)

func buttonAction(sender: Any) {
    print("test")
}

That gives me an "Thread 1: signal SIGABRT" error.

"You deleted an Outlet/Action connection in code or renamed it (spelling mistake?)." - is not the case :') — Kai Zheng
– Kai Zheng, Commented Oct 26, 2017 at 9:02
btn.addTarget(self, action: #selector(testFunction(_:)), for: .touchDown) swift 3.2 — Devang Tandel
– Devang Tandel, Commented Oct 26, 2017 at 9:04
Technically, you don't "add" an IBAction programmatically - the "IB" stands for "Interface Builder". What you mean to ask is how use the sender in an addTarget(action:) call. — user7014451
– user7014451, Commented Oct 26, 2017 at 9:44

Milan Nosáľ · Accepted Answer · 2020-05-27 06:22:58Z

15

Swift 4 version:

button.addTarget(self, action: #selector(action(sender:)), for: .touchUpInside)

@objc private func action(sender: Button) {
    print("test")
}

edited May 27, 2020 at 6:22

answered Oct 26, 2017 at 9:03

Milan Nosáľ

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6 Comments

Kai Zheng Over a year ago

Thanks for your reply, yea I've seen this code before. But Swift yells at me with: "Argument of '#selector' refers to instance method 'buttonAction(sender:)' that is not exposed to Objective-C Add '@objc' to expose this instance method to Objective-C"

Milan Nosáľ Over a year ago

that's why there is the @objc annotation

Fabio Berger Over a year ago

@Mofawaw then add "@objc", should look like "@objc func buttonAction()"

Milan Nosáľ Over a year ago

@objc func action(sender: Button)

Kai Zheng Over a year ago

I had to wait 2 minutes, not my programming. :')

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