SampleViewController

SampleViewController.swift

import UIKit


final class SampleViewController: UIViewController {
    
    private var isTapped: Bool = false
    
    let button: UIButton = {
        let button = UIButton()
        let image = UIImageView(image: UIImage(systemName: "play"))
        button.translatesAutoresizingMaskIntoConstraints = false
        button.backgroundColor = .yellow
        return button
    }()
    
    let littleView: UIView = {
        let view = UIView()
        view.translatesAutoresizingMaskIntoConstraints = false
        view.layer.borderColor = UIColor.red.cgColor
        view.layer.borderWidth = 4
        view.isUserInteractionEnabled = true
        view.backgroundColor = .red
        return view
    }()
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
        self.view.addSubview(button)
        self.view.addSubview(littleView)
        
        littleView.addGestureRecognizer(UIPanGestureRecognizer(target: self, action: #selector(handlePan(_:))))
        
        button.addTarget(self, action: #selector(buttonTapped), for: .touchUpInside)
        
        
        NSLayoutConstraint.activate([
            
            button.bottomAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.bottomAnchor),
            
            button.centerXAnchor.constraint(equalTo: self.view.centerXAnchor),
            littleView.heightAnchor.constraint(equalTo: self.view.heightAnchor, multiplier: 1/5),
            littleView.widthAnchor.constraint(equalTo: self.view.heightAnchor, multiplier: 1/3),
        
        ])
    }
    override func viewDidLayoutSubviews() {
        //littleView.frame = CGRect(x: 0, y: 0, width: littleView.frame.width, height: littleView.frame.height)
    }
    
    override func viewWillLayoutSubviews() {
        //littleView.frame = CGRect(x: 0, y: 0, width: littleView.frame.width, height: littleView.frame.height)
    }
    @objc private func buttonTapped() {
        button.setImage(UIImage(systemName: isTapped ? "play.slash" : "play"), for: .normal)
        self.view.layoutIfNeeded()
        isTapped.toggle()
        print("Button tapped")
    }
    
    @objc private func handlePan(_ gesture: UIPanGestureRecognizer) {
        guard let viewToMove = gesture.view else { return }
        if gesture.state == .began || gesture.state == .changed {
            let translation = gesture.translation(in: view)
            
            let newX = max(0, min(view.frame.width - viewToMove.frame.width, viewToMove.frame.origin.x + translation.x))
            let newY = max(0, min((view.frame.height - viewToMove.frame.height), viewToMove.frame.origin.y + translation.y))
            
            viewToMove.frame.origin = CGPoint(x: newX, y: newY)
            gesture.setTranslation(CGPoint.zero, in: view)
            
        }
    }
}