How do I call a button function when the button is not being pressed

Make your sender argument optional and pass nil to ButtonPressed.

self.ButtonPressed( nil )


@IBAction func ButtonPressed( sender: AnyObject? ) {
    println("Called Action")
}

One way would be to link your button up to its respective interface builder button and pass it into your function when you call it.

@IBOutlet weak var yourButton: UIButton!

self.buttonPressed(yourButton)

@IBAction func buttonPressed(sender: AnyObject) {
    print("Called Action")
}

Alternatively, define your function like so, then you'll be able to call your method the same way as you did before:

@IBAction func buttonPressed(sender: AnyObject? = nil) {
    print("Called Action")
}

// Call your method like this
self.buttonPressed()

// or this
self.buttonPressed(sender: nil)

Your ButtonPressed function needs an argument sender and yet you're not passing any when you call it. However, if you're doing this programatically, then you obviously don't have a sender.

Two ways to get around this:

• Make the sender parameter an optional (AnyObject? instead of AnyObject) and invoke self.ButtonPress(nil). I just tried this and it works.
• Put all the button press function in a separate function, e.g., performButtonPress(). Call it from inside the IBAction outlet, and if you want to press the button programatically, directly call performButtonPress().