Resizing UITableView to fit Content Swift

AutoRezingUiTableView.txt

StackOverflow answer by fl034 user.
Link: https://stackoverflow.com/questions/2595118/resizing-uitableview-to-fit-content/48623673#48623673

Swift 4.2 solution without KVO, DispatchQueue, or setting constraints yourself.

This solution is based on Gulz's answer.

1) Create a subclass of UITableView:

import UIKit

final class ContentSizedTableView: UITableView {
    override var contentSize:CGSize {
        didSet {
            invalidateIntrinsicContentSize()
        }
    }

    override var intrinsicContentSize: CGSize {
        layoutIfNeeded()
        return CGSize(width: UIView.noIntrinsicMetric, height: contentSize.height)
    }
}
2) Add a UITableView to your layout and set constraints on all sides. Set the class of it to ContentSizedTableView.

3) You should see some errors, because Storyboard doesn't take our subclass' intrinsicContentSize into account. 
Fix this by opening the size inspector and overriding the intrinsicContentSize to a placeholder value. 
This is an override for design time. At runtime it will use the override in our ContentSizedTableView class