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Possible Duplicate:
Xcode 4.2 Warnings when dropping Nav Controller on Tab Bar in IB

Every time I create a UINavigationController with interface builder there will be a warning:

Attribute Unavailable: Defines Presentation Context is not available prior to Xcode 4.2.

I know I can just uncheck Defines context in Navigation Controller to avoid this warning

but I want to know

I am using Xcode 4.2 and working on ios5

why this warning would show up??

and what's different if I check or uncheck Defines Context??

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IPaPa
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  • Couldn't it be that the warning is just there to warn you that you're generating code that's not compatible with an earlier version of the IDE? – Joachim Isaksson Feb 12 '12 at 07:20
  • I found the answer thanks http://stackoverflow.com/questions/8054961/how-can-i-fix-freeform-size-simulated-metrics-are-not-available-prior-to-xcode Interface builder default setting is Xcode 4.1 that's the problem – IPaPa Feb 12 '12 at 13:27

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