リロードしたときにテキストが下にずれ込むっていう話

MyViewController.swift

import UIKit
import PlaygroundSupport

class MyViewController : UIViewController {
    
    private let container: UIView = {
        
        let view = UIView(frame: .zero)
        view.backgroundColor = .white
        return view
    }()
    
    private let tableView: UITableView = {
        let tableView = UITableView(frame: .zero, style: .plain)
        tableView.translatesAutoresizingMaskIntoConstraints = false
        tableView.register(TableViewCell.self, forCellReuseIdentifier: "CELL")
        return tableView
    }()
    
    override func loadView() {
        
        tableView.dataSource = self
        container.addSubview(tableView)
        NSLayoutConstraint.activate([
            tableView.topAnchor.constraint(equalTo: container.topAnchor),
            tableView.leftAnchor.constraint(equalTo: container.leftAnchor),
            tableView.rightAnchor.constraint(equalTo: container.rightAnchor),
            tableView.bottomAnchor.constraint(equalTo: container.bottomAnchor)
        ])
        self.view = container
    }
    
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        
        // なにか遅延処理はしってその結果更新する
        DispatchQueue.main.asyncAfter(deadline: .now() + 1.0) {
            self.tableView.reloadData()
        }
    }
}

extension MyViewController: UITableViewDataSource {
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return 100
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        
        let cell = tableView.dequeueReusableCell(withIdentifier: "CELL", for: indexPath) as! TableViewCell
        cell.configure()
        
        return cell
    }
}

class TableViewCell: UITableViewCell {
    
    private let attributes: [NSAttributedString.Key: Any] = {
        
        let paragraph = NSMutableParagraphStyle()
        paragraph.minimumLineHeight = 22
        paragraph.maximumLineHeight = 22
        
        return [
            .paragraphStyle: paragraph,
            .font: UIFont.systemFont(ofSize: 12.0)
        ]
    }()
    
    override func prepareForReuse() {
        super.prepareForReuse()
        
        textLabel?.text = ""
    }
    
    func configure() {
        
        textLabel?.attributedText = NSAttributedString(
            string: "にゃーん",
            attributes: attributes
        )
    }
}

PlaygroundPage.current.liveView = MyViewController()