Swift3: Add button with code

Question

Im reading Apples swift (iOS) documentation but its written for Swift 2 and i use Swift 3. I want to add a button programmatically but its seems there is a change and I can't find how to fix it.

Here is the Code for the Swift 2 example:

import UIKit

class RatingControl: UIView {

// MARK: Initialization

required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)

    // Buttons
    let button = UIButton(frame: CGRect(x: 0, y: 0, width: 44, height: 44))
    button.backgroundColor = UIColor.red()
    button.addTarget(self, action: #selector(RatingControl.ratingButtonTapped(_:)), forControlEvents: .TouchDown)
    addSubview(button)
}

override func intrinsicContentSize() -> CGSize {
    return CGSize(width: 240, height: 44)
}

// MARK: Button Action

func ratingButtonTapped(button: UIButton){
    print("Button pressed")
}
}

The only change i made after the 'fix-it' showed the error is this in the selector:

button.addTarget(self, action: #selector(RatingControl.ratingButtonTapped(button:)), for: .touchDown)

This should have printed "Button pressed" but it doesn't. Any help?

Answer 1

My code:

button.backgroundColor = UIColor.red

button.addTarget(self, action: #selector(RatingControl.ratingButtonTapped(_:)), for: .touchDown)

override var intrinsicContentSize : CGSize {
//override func intrinsicContentSize() -> CGSize {
    //...
    return CGSize(width: 240, height: 44)
}

// MARK: Button Action
func ratingButtonTapped(_ button: UIButton) {
    print("Button pressed 👍")
}

Answer 2

Try something like this. I haven't tested but it should work:

let button = UIButton(frame: CGRect(x: 0, y: 0, width: 44, height: 44))
button.backgroundColor = UIColor.red
button.addTarget(self, action: #selector(ratingButtonTapped), for: .touchUpInside)
addSubview(button)

func ratingButtonTapped() {
    print("Button pressed")
}