Open Radar

 
Summary:
In some cases, Interface Builder will create Auto Layout constraints that have a 0.5pt constant. When these constraints are created, IB can lay out views successfully and report no conflicts or ambiguities; however, at runtime, these constraints can conflict with others due to the half point offset that IB seems to discard. The constant is not shown in the Attributes inspector; instead, it is reported as "0" (or "-0" if the constant is -0.5pt). However, opening the relevant .xib or .storyboard in an XML editor reveals the actual constant value.

I've attached a sample app that illustrates this behavior. Open the Main.storyboard file and set the size classes to compact width/regular height. In IB, there are no reported Auto Layout problems, but in a portrait iPhone 6, the console logs two conflicts.

Steps to Reproduce:
1. Open the attached sample project
2. Run on a portrait iPhone 6 Simulator

Expected Results:
Since IB shows no Auto Layout problems for the compact width/regular height case, I expect no exceptions logged to the console.

Actual Results:
Two Auto Layout constraint conflict exceptions are logged to the console.

Version:
Xcode 6.2 (6C107a) / OS X 10.10.2 (14C109)

Notes:


Configuration:
iPhone 6 Simulator in portrait orientation

Attachments:
'HWAdaptiveWeather.zip' was successfully uploaded.