A UIButton for tvOS that continuously sends events when pressed

PressButton.swift

//
//  PressButton.swift
//
//  Created by Giovanni Murru on 31/05/22.
//  Copyright © 2022 Giovanni Murru.
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//  THE SOFTWARE.


import UIKit

protocol PressButtonDelegate : AnyObject {
    func didStartPressing(_ sender: PressButton)
    func isPressing(_ sender: PressButton)
    func didStopPressing(_ sender: PressButton)
    func didCancelPressing(_ sender: PressButton)
}
//Makes all the protocol functions optional
extension PressButtonDelegate {
    func didStartPressing(_ sender: PressButton) {}
    func isPressing(_ sender: PressButton) {}
    func didStopPressing(_ sender: PressButton) {}
    func didCancelPressing(_ sender: PressButton) {}
}

class PressButton: UIButton {

    weak var delegate : PressButtonDelegate!
    var timer: Timer!
    
    override func pressesBegan(_ presses: Set<UIPress>, with event: UIPressesEvent?) {
        super.pressesBegan(presses, with: event)
        guard let press = presses.first else {
            super.pressesBegan(presses, with: event)
            return
        }
        switch press.type {
        case .select:
            timer = Timer.scheduledTimer(timeInterval: 1.0/60.0, target: self, selector: #selector(userIsPressing), userInfo: nil, repeats: true)
            delegate?.didStartPressing(self)
        default:
            super.pressesBegan(presses, with: event)
            break
        }
        
    }

    override func pressesEnded(_ presses: Set<UIPress>, with event: UIPressesEvent?) {
        super.pressesEnded(presses, with: event)
        guard let press = presses.first else {
            super.pressesEnded(presses, with: event)
            return
        }
        switch press.type {
        case .select:
            timer.invalidate()
            delegate?.didCancelPressing(self)
        default:
            super.pressesEnded(presses, with: event)
            break
        }
    }
    
    override func pressesCancelled(_ presses: Set<UIPress>, with event: UIPressesEvent?) {
        super.pressesCancelled(presses, with: event)
        guard let press = presses.first else {
            super.pressesCancelled(presses, with: event)
            return
        }
        switch press.type {
        case .select:
            timer.invalidate()
            delegate?.didStopPressing(self)
        default:
            super.pressesCancelled(presses, with: event)
            break
        }
    }
    
    @objc func userIsPressing() {
        delegate?.isPressing(self)
    }
}