Open Radar

 
Summary:
There is a NSLayoutConstraint conflict while using a UIDocumentMenuViewController and selecting a UIDocumentPickerViewController.

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:0x7fb43978df90 H:[UIView:0x7fb439786140(304)]>",
    "<NSLayoutConstraint:0x7fb4396bad40 _UIAlertControllerView:0x7fb439785c40.width == UIView:0x7fb439785b00.width>",
    "<NSLayoutConstraint:0x7fb4396c58f0 'UIView-Encapsulated-Layout-Width' H:[UIView:0x7fb439785b00(142)]>",
    "<NSLayoutConstraint:0x7fb43978c4b0 _UIAlertControllerView:0x7fb439785c40.width >= UIView:0x7fb439786140.width>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x7fb43978df90 H:[UIView:0x7fb439786140(304)]>

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.



Steps to Reproduce:
Instantiate and present a UIDocumentMenuViewController
Select the iCloud document provider

Expected Results:


Actual Results:
The log appears on the debugger, however the popover content seams to show correctly

Regression:

Notes:
I managed to fix the log by applying setTranslatesAutoresizingMaskIntoConstraints to NO to the document menu view.
The file attached contains the printed view hirarchy in the context when the error occurs