I want to receive the TableViewCell layout event in RxSwift's "tableView.rx.willDisplayCell" and animate the text using CAD DisplayLink in subscribe.

import RxSwift
import RxCocoa

class AchievementRateCell:UITableViewCell{
    
    static let cellId="AchievementRateCellId"
    
    let percentageNumberLabel: UILabel={
        let label = UILabel()
        label.text = "0%"
        label.textAlignment=.center
        label.font=.systemFont(ofSize:20)
        label.lastLetterToSmall(value:label.text!)
        return label
    }()
    
    letachievementRateCircleView=CircleProgressView()
    
    US>deinit{
        print("AchievementRateCell deinit")
    }
    
    override init(style:UITableViewCell.CellStyle, reuseIdentifier: String?) {
        super.init(style:style, reuseIdentifier:reuseIdentifier)
        print("AchievementRateCell init")
        
        let stackView = UISTackView (arrangedSubviews: [achievementRateCircleView, percentageNumberLabel])
        addSubview (stackView)
        stackView.topAnchor.constraint(equalTo:topAnchor).isActive=true
        stackView.bottomAnchor.constraint(equalTo:bottomAnchor).isActive=true
        stackView.leadingAnchor.constraint(equalTo:leadingAnchor).isActive=true
        stackView.trailingAnchor.constraint(equalTo:trailingAnchor).isActive=true
    }
    
    func bind (to viewModel: AchievementRateCellViewModel) {
        
        viewModel.achievementRate
            .subscribe(onNext:{[weak self] rate in
                let basicAnimation = CABasicAnimation (keyPath: "strokeEnd")
                basicAnimation.toValue=rate
                basicAnimation.duration=rate*(self?.animationSpeed??1.5)
                basicAnimation.fillMode=CAMediaTimingFillMode.forwards
                basicAnimation.isRemovedOnCompletion=false
                self?.achievementRateCircleView.foregroundLayer.add(basicAnimation, forKey: "urSoBasic")
            }).disposed (by:disposeBag)
        

　　　　// ↓↓↓↓↓↓ Receive tableView.rx.willDisplayCell event in this part.
        viewModel.achievementRate
            .subscribe(onNext:{[weak self] rate in
                self?.rate=rate
                self?.countupOnLabel()
            })
            .disposed (by:disposeBag)
    }
    
    
    variationStartDate: Date=Date()
    variable rate —Double = 0
    let animationSpeed=1.5
    
    private func countupOnLabel(){
        animationStartDate=Date()


　　　　　　　　　　　　　　　// ↓↓↓↓↓ Is there a circular reference due to the self in this part?
        let displayLink = CAD displayLink (target:self, selector:#selector(handleUpdate))
        displayLink.add (to:.current, forMode:.common)
    }
    
    @objc funchandleUpdate(){
        let now = Date()
        letelappedTime=now.timeIntervalSince(animationStartDate)
        let duration = rate * animationSpeed

        if elappedTime>duration{
            let stringEndValue = String(format: "%.0f%", rate*100) + "%"
            percentageNumberLabel.text=stringEndValue
            percentageNumberLabel.lastLetterToSmall (value:stringEndValue)
        } else{
            let persentage=elappedTime/duration
            let value = percentage * rate
            let stringValue=String(format: "%.0f%", value*100) + "%"
            percentageNumberLabel.text=stringValue
            percentageNumberLabel.lastLetterToSmall (value:stringValue)
        }

    }
    
    
    required init?(coder:NSCoder) {
        fatalError("init(coder:)has not been implemented")
    }
}