Fix compilation of the project when using Xcode 9 new build system and CocoaPods #506
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With current podspec, one .xib file is getting picked up as a source, and is getting into Xcode Compile Sources build step in CocoaPods generated project.
New build system is more strict than the old one, and prohibits this by saying:
This behavior is described in this CocoaPods issue.
This PR changes source_files search path from being * to more specific code-related one *.{h,m,swift}, thus picking only sources into sources.
This fix can be verified by installing XLPagerTabStrip, trying to build with new Build System - it will fail. Then you can remove ButtonCell.xib file from Pods -> XLPagerTabStrip -> Compile Sources build phase and this time project will build successfully.