Pan Gesture 사용 - 1

• ViewController.swift

//
//  ViewController.swift
//  panGesture
//
//  Created by yoon-yeoungjin on 2022/03/26.
//

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        let myView = DraggbleView()
        myView.center = self.view.center
        myView.bounds = CGRect(x: 0, y: 0, width: 100, height: 100)
        myView.backgroundColor = .red
        self.view.addSubview(myView)
        // Do any additional setup after loading the view.
    }


}

• DraggbleView.swift

//
//  DraggbleView.swift
//  panGesture
//
//  Created by yoon-yeoungjin on 2022/03/26.
//

import Foundation
import UIKit

class DraggbleView: UIView {
    override init(frame: CGRect) {
        super.init(frame: CGRect.zero)
        let pan = UIPanGestureRecognizer(target: self, action: #selector(dragging))
        self.addGestureRecognizer(pan)
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    @objc func dragging(pan: UIPanGestureRecognizer){
        switch pan.state {
        case .began:
            print("began pan gesture")
        case .changed:
            let delta = pan.translation(in: self.superview)
            var myPosition = self.center
            myPosition.x += delta.x
            myPosition.y += delta.y
            print("x : ", myPosition.x, " y: ", myPosition.y)

            self.center = myPosition

            pan.setTranslation(CGPoint.zero, in: self.superview)
        case .ended:
            print("end pan gesture")
        @unknown default:
            print("err")
        }
    }
}

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