iOS) Custom Camera에서 view 터치 할때 사각형 이미지 표시하기

1. CameraFocusSquare 클래스 생성

//
//  CameraFocusSquare.swift
//  customCameraView
//
//  Created by Ik ju Song on 2019/11/14.
//  Copyright © 2019 Ik ju Song. All rights reserved.
//

import UIKit

class CameraFocusSquare: UIView,CAAnimationDelegate {
    
    internal let kSelectionAnimation:String = "selectionAnimation"
    
    fileprivate var _selectionBlink: CABasicAnimation?
    
    convenience init(touchPoint: CGPoint) {
        self.init()
        self.updatePoint(touchPoint)
        self.backgroundColor = UIColor.clear
        self.layer.borderWidth = 1.0
        self.layer.borderColor = UIColor.orange.cgColor
        initBlink()
    }
    
    override init(frame: CGRect) {
        super.init(frame: frame)
    }
    
    fileprivate func initBlink() {
        // create the blink animation
        self._selectionBlink = CABasicAnimation(keyPath: "borderColor")
        self._selectionBlink!.toValue = (UIColor.white.cgColor as AnyObject)
        self._selectionBlink!.repeatCount = 3
        // number of blinks
        self._selectionBlink!.duration = 0.4
        // this is duration per blink
        self._selectionBlink!.delegate = self
    }
    
    
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    /**
     Updates the location of the view based on the incoming touchPoint.
     */
    
    func updatePoint(_ touchPoint: CGPoint) {
        let squareWidth: CGFloat = 80
        let frame: CGRect = CGRect(x: touchPoint.x - squareWidth / 2, y: touchPoint.y - squareWidth / 2, width: squareWidth, height: squareWidth)
        self.frame = frame
    }
    /**
     This unhides the view and initiates the animation by adding it to the layer.
     */
    
    func animateFocusingAction() {
        
        if let blink = _selectionBlink {
            // make the view visible
            self.alpha = 1.0
            self.isHidden = false
            // initiate the animation
            self.layer.add(blink, forKey: kSelectionAnimation)
        }
        
    }
    /**
     Hides the view after the animation stops. Since the animation is automatically removed, we don't need to do anything else here.
     */
    
    public func animationDidStop(_ anim: CAAnimation, finished flag: Bool){
        if flag{
            // hide the view
            self.alpha = 0.0
            self.isHidden = true
        }
    }
}

2. ViewContorller클래스에 코드 작성

@objc func tapToFocus(_ gesture : UILongPressGestureRecognizer) {

        if (gesture.state == UIGestureRecognizer.State.began) {
            //view1은 카메라 스크린이 나오는 뷰
            let touchPoint:CGPoint = gesture.location(in: self.view1)

            
            let focusSquare = CameraFocusSquare(touchPoint: touchPoint)
            
            self.view1.addSubview(focusSquare)
            focusSquare.setNeedsDisplay()
            

            focusSquare.animateFocusingAction()
            print(#function)
            
        }
    }

3. viewContorller 클래스에 델리게이트 작성 (UIGestureRecognizerDelegate )

class ViewController: UIViewController, AVCapturePhotoCaptureDelegate, UIGestureRecognizerDelegate 

4. viewDidLoad 함수에 코드추가

override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        
        
        setuplayout()
        
        
        let touch_ractangle = UILongPressGestureRecognizer(target: self, action: #selector(tapToFocus))
        touch_ractangle.delegate = self
        
        view1.addGestureRecognizer(touch_ractangle)
        
        
    }

끝