Open Radar

 
Summary:
If you add constraints to a UITableViewHeaderFooterView's contentView requiring that it have a positive height or width, an unsatisfiable constraint exception is thrown involving a constraint with identifier UIView-Encapsulated-Layout-Width/Height.

Steps to Reproduce:
1. Add constraints to UITableViewHeaderFooterView's contentView requiring that it have a positive height or width. See the attached code for an example.
2. Use the UITableViewHeaderFooterView in a UITableView as a section header.

Expected Results:
A 10pt height table view section header

Actual Results:
A 10pt height table view section header with the following logged to the console:

2014-09-16 22:40:09.400 TableViewSectionHeaderFooterOS8Bug[5485:100111] Unable to simultaneously satisfy constraints.
	Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) 
(
    "<NSLayoutConstraint:0x7f9f0a7267f0 H:|-(5)-[UILabel:0x7f9f0a725400'hiii']   (Names: '|':_UITableViewHeaderFooterContentView:0x7f9f0a724ea0 )>",
    "<NSLayoutConstraint:0x7f9f0a726bb0 H:[UILabel:0x7f9f0a725400'hiii']-(5)-|   (Names: '|':_UITableViewHeaderFooterContentView:0x7f9f0a724ea0 )>",
    "<NSLayoutConstraint:0x7f9f0a72a290 'UIView-Encapsulated-Layout-Width' H:[_UITableViewHeaderFooterContentView:0x7f9f0a724ea0(0)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x7f9f0a726bb0 H:[UILabel:0x7f9f0a725400'hiii']-(5)-|   (Names: '|':_UITableViewHeaderFooterContentView:0x7f9f0a724ea0 )>

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.

Version:
iOS 8.0 (12A365)

Notes:
repro app attached

Configuration:
iPhone 6 Simulator

Attachments:
'TableViewSectionHeaderFooterOS8Bug.zip' was successfully uploaded.