LineView Animation

import UIKit

class LineView: UIView, XibViewProtocol {
    @IBOutlet var contentView: UIView!

    @IBOutlet var widthC: NSLayoutConstraint!
    
    private var timer: DispatchSourceTimer?
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        loadNib()
    }

    required init?(coder: NSCoder) {
        super.init(coder: coder)
        loadNib()
    }

    override func awakeFromNib() {
        super.awakeFromNib()
    }
    
    
    private func setTimer(){
        timer?.setEventHandler {[weak self] in
            guard let `self` = self else {
                return
            }

            self.seconds -= 0.1

            print("seconds = == == = \(self.seconds)")
            if self.seconds < 0 {
                self.timer?.cancel()
                self.widthC.constant = 0.0
                print("secondsOVER!!!!!!")

            } else {
                
                UIView.animate(withDuration: 0.1) {
                    self.widthC.constant += (self.bounds.size.width / self.total) * 0.1
                    self.layoutIfNeeded()
                }
            }
            

        }
    }
    
    private var seconds: TimeInterval = 0.0
    private var total: TimeInterval = 1.0
    
    @objc public func startAnimate(time: TimeInterval){
        timer?.cancel()
        timer = nil
        self.widthC.constant = 0.0
        
        timer = DispatchSource.makeTimerSource(flags: [], queue: DispatchQueue.main)
        total = time
        seconds = time
        timer?.schedule(deadline: .now(),repeating: 0.1)
        setTimer()
        timer?.resume()
    }

}