Detail and image popup

private func popUp(index: Int) {

        var size = CGSize()
        let imageSize: CGFloat = 75

        if UIDevice.current.userInterfaceIdiom == .pad
        {
            size = CGSize(width: 330, height: 240)
        }
        else
        {
            size = CGSize(width: self.view.frame.width * 0.87, height: 225)
        }

        let mainView = UIView(frame: .zero)
        mainView.backgroundColor = .white
        mainView.translatesAutoresizingMaskIntoConstraints = false
        mainView.layer.cornerRadius = 8
        mainView.isUserInteractionEnabled = true
        mainView.clipsToBounds = true
        mainView.layer.zPosition = 5
        mainView.transform = CGAffineTransform(scaleX: 0, y: 0)

        guard !background.isDescendant(of: self.view) else {
            return
        }

        background.backgroundColor = UIColor(white: 0.1, alpha: 0.37)
        background.layer.zPosition = 4
        background.isUserInteractionEnabled = false
        background.translatesAutoresizingMaskIntoConstraints = false

        let colorView = UIView(frame: .zero)
        colorView.backgroundColor = .blueColor
        colorView.translatesAutoresizingMaskIntoConstraints = false

        let image = UIImageView(frame: .zero)
        image.contentMode = .scaleAspectFill
        image.translatesAutoresizingMaskIntoConstraints = false

        if requests[index].image != nil && requests[index].image != "" {
            image.loadImageUsingCache(withUrl: requests[index].image)
        } else {
            image.image = UIImage(named: "avatar")
        }

        let nameLbl = UILabel(frame: .zero)
        nameLbl.font = UIFont.systemFont(ofSize: 22, weight: .regular)
        nameLbl.translatesAutoresizingMaskIntoConstraints = false
        nameLbl.text = requests[index].username

        let subjLbl = UILabel(frame: .zero)
        subjLbl.font = UIFont.systemFont(ofSize: 19)
        subjLbl.textColor = .lightGray
        subjLbl.translatesAutoresizingMaskIntoConstraints = false
        subjLbl.text = requests[index].subject_name

        let stdLbl = UILabel(frame: .zero)
        stdLbl.textColor = .lightGray
        stdLbl.font = UIFont.systemFont(ofSize: 19)
        stdLbl.translatesAutoresizingMaskIntoConstraints = false
        stdLbl.text = "Std - \(requests[index].standard)"

        let addressLbl = UILabel(frame: .zero)
        addressLbl.textColor = .lightGray
        addressLbl.numberOfLines = 2
        addressLbl.font = UIFont.systemFont(ofSize: 19)
        addressLbl.translatesAutoresizingMaskIntoConstraints = false
        addressLbl.text = requests[index].location ?? ""

        let acceptBut = UIButton(frame: .zero)
        acceptBut.backgroundColor = #colorLiteral(red: 0.4500938654, green: 0.9813225865, blue: 0.4743030667, alpha: 1)
        acceptBut.setTitleColor(#colorLiteral(red: 0.2106181933, green: 0.4906361527, blue: 0.5, alpha: 1), for: .normal)
        acceptBut.setTitle("Accept", for: .normal)
        acceptBut.titleLabel?.font = .systemFont(ofSize: 17, weight: .semibold)
        acceptBut.layer.cornerRadius = 6
        acceptBut.translatesAutoresizingMaskIntoConstraints = false
        acceptBut.addAction(UIAction(handler: { (act) in
            hideView()
            let but = UIButton()
            but.tag = index
            self.acceptAction(sender: but)
        }) , for: .touchUpInside)

        let crossBut = UIButton(frame: .zero)
        let butImg = UIImage(systemName: "xmark", withConfiguration: UIImage.SymbolConfiguration(pointSize: 20, weight: .light))
        crossBut.translatesAutoresizingMaskIntoConstraints = false
        crossBut.setImage(butImg, for: .normal)
        crossBut.tintColor = .lightGray
        crossBut.addAction( UIAction(handler: { (act) in
            hideView()
        }) , for: .touchUpInside)

        self.view.addSubview(mainView)
        self.view.addSubview(background)
        mainView.addSubview(image)
        mainView.addSubview(nameLbl)
        mainView.addSubview(subjLbl)
        mainView.addSubview(stdLbl)
        mainView.addSubview(addressLbl)
        mainView.addSubview(colorView)
        mainView.addSubview(acceptBut)
        mainView.addSubview(crossBut)

        mainView.heightAnchor.constraint(equalToConstant: size.height).isActive = true
        mainView.widthAnchor.constraint(equalToConstant: size.width).isActive = true
        mainView.centerXAnchor.constraint(equalToSystemSpacingAfter: self.view.centerXAnchor, multiplier: 0).isActive = true
        mainView.centerYAnchor.constraint(equalTo: self.view.centerYAnchor, constant: -100).isActive = true

        background.topAnchor.constraint(equalTo: self.view.topAnchor).isActive = true
        background.bottomAnchor.constraint(equalTo: self.view.bottomAnchor).isActive = true
        background.leadingAnchor.constraint(equalTo: self.view.leadingAnchor).isActive = true
        background.trailingAnchor.constraint(equalTo: self.view.trailingAnchor).isActive = true

        image.heightAnchor.constraint(equalToConstant: imageSize).isActive = true
        image.widthAnchor.constraint(equalToConstant: imageSize).isActive = true
        image.centerYAnchor.constraint(equalToSystemSpacingBelow: mainView.centerYAnchor, multiplier: 0).isActive = true
        image.leadingAnchor.constraint(equalTo: mainView.leadingAnchor, constant: 20).isActive = true

        image.layer.masksToBounds = true
        image.layer.cornerRadius = imageSize / 2

        stdLbl.heightAnchor.constraint(equalToConstant: 25).isActive = true
        stdLbl.centerYAnchor.constraint(equalTo: image.centerYAnchor, constant: 0).isActive = true
        stdLbl.leadingAnchor.constraint(equalTo: image.trailingAnchor, constant: 15).isActive = true
        stdLbl.trailingAnchor.constraint(greaterThanOrEqualTo: mainView.trailingAnchor, constant: 5).isActive = true

        nameLbl.leadingAnchor.constraint(equalTo: image.trailingAnchor, constant: 15).isActive = true
        nameLbl.heightAnchor.constraint(equalToConstant: 25).isActive = true
        nameLbl.trailingAnchor.constraint(greaterThanOrEqualTo: mainView.trailingAnchor, constant: 5).isActive = true
        nameLbl.bottomAnchor.constraint(equalTo: subjLbl.topAnchor, constant: -8).isActive = true

        subjLbl.leadingAnchor.constraint(equalTo: image.trailingAnchor, constant: 15).isActive = true
        subjLbl.heightAnchor.constraint(equalToConstant: 25).isActive = true
        subjLbl.trailingAnchor.constraint(greaterThanOrEqualTo: mainView.trailingAnchor, constant: 15).isActive = true
        subjLbl.bottomAnchor.constraint(equalTo: stdLbl.topAnchor, constant: -8).isActive = true

        addressLbl.heightAnchor.constraint(equalToConstant: 50).isActive = true
        addressLbl.leadingAnchor.constraint(equalTo: image.trailingAnchor, constant: 15).isActive = true
        addressLbl.trailingAnchor.constraint(lessThanOrEqualTo: mainView.trailingAnchor, constant: 10).isActive = true
        addressLbl.topAnchor.constraint(equalTo: stdLbl.bottomAnchor, constant: 8).isActive = true

        colorView.heightAnchor.constraint(equalToConstant: 7.5).isActive = true
        colorView.topAnchor.constraint(equalTo: mainView.topAnchor).isActive = true
        colorView.leadingAnchor.constraint(equalTo: mainView.leadingAnchor).isActive = true
        colorView.trailingAnchor.constraint(equalTo: mainView.trailingAnchor).isActive = true

        acceptBut.heightAnchor.constraint(equalToConstant: 35).isActive = true
        acceptBut.widthAnchor.constraint(equalToConstant: 80).isActive = true
        acceptBut.bottomAnchor.constraint(equalTo: mainView.bottomAnchor, constant: -8).isActive = true
        acceptBut.trailingAnchor.constraint(equalTo: mainView.trailingAnchor, constant: -14).isActive = true

        crossBut.heightAnchor.constraint(equalToConstant: 35).isActive = true
        crossBut.widthAnchor.constraint(equalToConstant: 35).isActive = true
        crossBut.topAnchor.constraint(equalTo: colorView.bottomAnchor, constant: 0).isActive = true
        crossBut.trailingAnchor.constraint(equalTo: mainView.trailingAnchor, constant: 0).isActive = true

        UIView.animateKeyframes(withDuration: 0.9, delay: 0, options: .layoutSubviews)
        {
            UIView.addKeyframe(withRelativeStartTime: 0, relativeDuration: 1/1.3)
            {
                mainView.transform = CGAffineTransform(scaleX: 1.2, y: 1.2)
            }

            UIView.addKeyframe(withRelativeStartTime: 1/3, relativeDuration: 1/3)
            {
                mainView.transform = .identity
            }
        }
        completion: { (animation) in
            print("Animation Done!")
        }

        func hideView() {
            // Call hide animation here
            UIView.animateKeyframes(withDuration: 0.7, delay: 0, options: .layoutSubviews)
            {

                UIView.addKeyframe(withRelativeStartTime: 0, relativeDuration: 1/3)
                {
                    mainView.transform = CGAffineTransform(scaleX: 1.2, y: 1.2)
                }

                UIView.addKeyframe(withRelativeStartTime: 1/1.3, relativeDuration: 1/1.3)
                {
                    mainView.transform = CGAffineTransform(scaleX: 0, y: 0)
                }

            } completion:
            { (animation) in
                mainView.removeFromSuperview()
                self.background.removeFromSuperview()
                mainView.transform = .identity
            }
        }
    }