Swift UIViewを再描画

autolayout使わない方法メモ
と言ってもframeをセットしなおしてるだけ

import UIKit

class ViewController: UIViewController {

    var wrapper: Wrapper!

    class Wrapper: UIView {

        var message = UILabel()

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

        override init(frame: CGRect) {
            super.init(frame: frame)
            self.setView()
        }

        func setView() {
            message.text = "未設定"
            message.font = UIFont.systemFont(ofSize: 20)
            message.numberOfLines = 0
            addSubview(message)

            updateLayout()
        }

        func updateLayout() {

            let margin: CGFloat = 10
            let size = message.sizeThatFits(CGSize(width: frame.width - margin*2, height: 0))
            message.frame = CGRect(x: 0, y: margin, width: frame.width - margin*2, height: size.height)
            frame.size = CGSize(width: frame.width, height: message.frame.origin.y + message.frame.height + 10)
        }
    }
    override func viewDidLoad() {
        super.viewDidLoad()

        wrapper = Wrapper(frame: CGRect(x: 10, y: 30, width: view.frame.width - 10*2, height: 0))
        wrapper.backgroundColor = UIColor.lightGray
        view.addSubview(wrapper)

	DispatchQueue.main.asyncAfter(deadline: .now() + 8) {
            self.wrapper.message.text = "1行目\n2行目\n3行目"
            self.wrapper.updateLayout()
	}
    }
}

以上です