Swift Playgrounds UIButton无法正常工作

Question

I've got this UIButton called 'start button' in swift playgrounds. This is the setup for it.

    func setupStartButton() {
        startButton.frame = CGRect(x: 15, y: 550, width: 125, height: 50)
        startButton.backgroundColor = UIColor(ciColor: CIColor(red: 255/255, green: 0/255, blue: 77/255, alpha: 1.0))
        startButton.layer.cornerRadius = 20
        startButton.setTitle("Start", for: .normal)
        startButton.setTitleColor(.white, for: .normal)
        startButton.addTarget(self, action: #selector(startButtonTapped), for: .touchUpInside)
        view.addSubview(startButton)

I call this in viewDidLoad().

    override func viewDidLoad() {
        view.frame = CGRect(x: 0, y: 0, width: 524, height: 766)
        view.backgroundColor = .white

        setupStartButton()

        PlaygroundPage.current.liveView = view
        PlaygroundPage.current.needsIndefiniteExecution = true
    }

But when I tap on a button it doesn't run the function called 'startButtonTapped' which just prints "Hello" to the console.

This is the function 'startButtonTapped'.

    @objc func startButtonTapped() {
        print("Hello")
    }

Why does it not do anything when I tap the button? How can I fix this?
Thank you

Answer 1

I can't see the rest of your code. I just quickly created one so that you could compare with your own code.

import UIKit
import PlaygroundSupport

class VC: UIViewController {

    let startButton = UIButton(type: .system)

    override func viewDidLoad() {
        super.viewDidLoad()

        setupStartButton()
    }

    func setupStartButton() {
        startButton.frame = CGRect(x: 15, y: 550, width: 125, height: 50)
        startButton.backgroundColor = UIColor(ciColor: CIColor(red: 255/255, green: 0/255, blue: 77/255, alpha: 1.0))
        startButton.layer.cornerRadius = 20
        startButton.setTitle("Start", for: .normal)
        startButton.setTitleColor(.white, for: .normal)
        startButton.addTarget(self, action: #selector(startButtonTapped), for: .touchUpInside)
        view.addSubview(startButton)
    }

    @objc func startButtonTapped() {
        print("Hello")
    }
}

let vc = VC()
PlaygroundPage.current.liveView = vc