Thread 1: "Unable to activate constraint with anchors

앱을 만들다 도중 발생한 쓰레드 1 error ..
앵커로 제약조건을 활성화가 되지 않는다라...
일단 대충 layout 관련인 에러인지는 알겠는데,,,
마지막에 보이는 !! dropbutton 에 관한 거구나..라는것도!! 알겠는데...
굉장히 당황스러운건...?

이런식으로 첫 쓰레드 때는 잘작동이 된다는것!!
근데 크러쉬가 취소!! 즉 제가 뷰를 dismiss 시킬때 문제가 되는 것인데유!!

보통 이런문제는 LayoutConstraints 가 잡히고 view에 addSubview 를 하는 경우
발생 된다고들 하는데......
snapkit으로 잡았던 레이아웃도 NS로 잡아봤지만 그 방법도 크러쉬...
dropbutton자체를 라이브러리 사용하지 않고 만들어서 써서 그런가..라는..
생각도 들고...

import UIKit
import SnapKit

// Upload에서 쓸 드롭버튼
// 라이브러리 쓸까하다가 만들어서 사용하기로
class dropButton : UIButton, dropProtocol {
func didTapDropButton(string: String) {
self.setTitle(string, for: .normal)
self.dismissButton() //선택되면 dismiss
}

var drop = dropView()

// Snapkit 으로 layout 설정시 변하는 layout을 사용할때씀
var heightConstant : Constraint? = nil

override init(frame: CGRect) {
    super.init(frame: frame)
    drop.layer.cornerRadius = 10
    drop = dropView.init(frame: .zero)
    drop.translatesAutoresizingMaskIntoConstraints = false
    drop.delegate = self //연결!! 필수 쫌하자!!
}
override func didMoveToSuperview() {
    self.superview?.addSubview(drop)
    
    self.superview?.bringSubviewToFront(drop)
    drop.snp.makeConstraints { (make) in
        make.top.equalTo(self.snp.bottom)
        make.centerX.equalTo(self.snp.centerX)
        make.width.equalTo(self.snp.width)
        heightConstant = make.height.equalTo(0).constraint
    }
}
var openValue = false

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    if openValue == false {
        openValue = true
        
        if self.drop.tableView.contentSize.height > 80 {
            self.heightConstant?.update(offset: 80)
        }else{
            self.heightConstant?.update(offset: self.drop.tableView.contentSize.height)
        }
        UIView.animate(withDuration: 0.5, delay: 0.5, options: .curveEaseOut, animations: {
            self.drop.layoutIfNeeded()
            self.drop.center.y += self.drop.frame.height / 2
        }, completion: nil)
    } else{
        openValue = false
        self.heightConstant?.update(offset: 0)
        UIView.animate(withDuration: 0.5, delay: 0.5, options: .curveEaseIn, animations: {
            self.drop.center.y -= self.drop.frame.height / 2
            self.drop.layoutIfNeeded()
        }, completion: nil)
    }
}
required init?(coder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}
func dismissButton(){
    openValue = false
    self.heightConstant?.update(offset: 0)
    UIView.animate(withDuration: 0.5, delay: 0.5, options: .curveEaseIn, animations: {
        self.drop.center.y -= self.drop.frame.height / 5
        self.drop.layoutIfNeeded()
    }, completion: nil)
}

}
class dropView : UIView , UITableViewDelegate , UITableViewDataSource{

var option = [String]()

var tableView = UITableView()

var delegate : dropProtocol!


override init(frame: CGRect) {
    super.init(frame: frame)
    tableView.delegate = self
    tableView.dataSource = self
    tableView.layer.cornerRadius = 10
    tableView.translatesAutoresizingMaskIntoConstraints = false
    tableView.backgroundColor = .secondaryLabel
    self.addSubview(tableView)
    tableView.snp.makeConstraints { (make) in
        make.top.equalToSuperview()
        make.left.equalToSuperview()
        make.right.equalToSuperview()
        make.bottom.equalToSuperview()
    }
    
}

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


func numberOfSections(in tableView: UITableView) -> Int {
    return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return option.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = UITableViewCell()
    cell.textLabel?.text = option[indexPath.row]
    cell.textLabel?.font = .systemFont(ofSize: 10, weight: .bold)
    cell.textLabel?.textColor = .secondarySystemBackground
    cell.backgroundColor = .secondaryLabel
    return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    self.delegate.didTapDropButton(string: option[indexPath.row])
    self.tableView.deselectRow(at: indexPath, animated: true)
}

}
protocol dropProtocol {
func didTapDropButton(string:String)
}

흠..일단 이건 버리고 그냥 드롭버튼 라이브러리를 사용해야겠다..ㅎㅎ