I thought this information would have been easier to find :-)
What is the default height of a UITableViewCell? It looks like 44 pixels, but I\'d prefer to be sure.
On iOS 12 the default height on iPhone X like devices (X, XS, XS Max, XR) is 49pt.
Other devices on iOS 12 still have 44pt as default. It's a subtle difference, but it feels like a good improvement in direct comparison.
If you won't believe me, measure for yourself in this screenshot (don't forget to divide by 3)... ;)
In Swift 4 and Swift 5 simply use:
UITableView.automaticDimension
Using 44px won't suffice because it will vary with different screen pixel densities.