탭, 누르고 있기를 통해서 탭 카운터의 숫자를 올리는 playground code.  인터페이스 빌더 없고, 뷰 컨트롤러 대신 간이 컨트롤러를 사용했다.

TapCounter-Playground.swift

import UIKit
import PlaygroundSupport

class Controller: NSObject {
    
    var button: UIButton
    var label: UILabel
    var view: UIView
    
    var count: Int = 0 {
        didSet {
            label.text = "\(count)"
        }
    }
    
    let ges = UILongPressGestureRecognizer()
    var timer: Timer?
    
    override init() {
        view = UIView(frame:CGRect(x:0, y:0, width: 100, height: 150))
        button = UIButton()
        label = UILabel()
        
        super.init()
        
        prepareView()
    }
    
    /// 뷰 계층 구조를 생성하고 레이아웃을 준비함.
    func prepareView() {
        
        [button, label].forEach {
            guard let v = $0 as? UIView else { return }
            view.addSubview(v)
            v.translatesAutoresizingMaskIntoConstraints = false
        }
        
        label.text = "tap to start"
        label.textAlignment = .center
        
        button.setTitle("+", for: .normal)
        button.setTitleColor(UIColor.blue, for: .normal)
        
        let font = UIFont.systemFont(ofSize: 32)
        label.font = font
        
        let views: [String: UIView] = ["button": button, "label": label ]
        var constraints = NSLayoutConstraint.constraints(withVisualFormat: "V:|-[label]-(>=30)-[button]-|", options: [.alignAllCenterX], metrics: nil, views: views)
        
        constraints += NSLayoutConstraint.constraints(withVisualFormat: "|-[label]-|", options: [], metrics: nil, views: views)
        NSLayoutConstraint.activate(constraints)
        view.backgroundColor = UIColor.white
        
        button.addTarget(self, action: #selector(self.tapped(_:)), for: .touchUpInside)
        ges.addTarget(self, action: #selector(self.pressed(_:)))
        button.addGestureRecognizer(ges)
    }
    
    func tapped(_ sender: Any?) {
        count += 1
    }
    
    func pressed(_ sender: UIGestureRecognizer?) {
        guard let ges = sender as? UILongPressGestureRecognizer else { return }
        switch ges.state {
        case .began:
            print("pressed")
            let timer = Timer(timeInterval: 0.05, repeats: true, block: {[unowned self] (_) in
                self.count += 1
            })
            RunLoop.main.add(timer, forMode: .defaultRunLoopMode)
            self.timer = timer
        case .cancelled, .ended:
            print("ended")
            self.timer?.invalidate()
            self.timer = nil
        default:
            print(ges.state.rawValue)
            break
        }
    }
}

let c = Controller()

PlaygroundPage.current.liveView = c.view