UILabel + UIStackView + IBDesignable + UITableViewCell == bad display

Number:rdar://29950447 Date Originated:1/10/2017
Status:Open Resolved:
Product:Xcode Product Version:8.2.1
Classification:Serious Bug Reproducible:Yes
In IB (works at runtime) if I set the font of a UILabel subclass in the prepareForInterfaceBuilder() method the frame of said label gets set to zero. 

It only happens when the UIStackView is in a UITableViewCell or UICollectionViewCell. It works fine in a simple UIViewController/UIView.

Steps to Reproduce:
Open the project in Xcode.

Expected Results:
The labels should be of the correct size and location

Actual Results:
The frames of the labels are set to a size of zero.

MacOS 10.2.2 (16C67)
Xcode 8.2.1 (8C1002)


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