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    <p>The issue you have encountered seems to be C++ standard library related. </p> <p>Actually, whenever you see linker failures in relationship with standard library objects (e.g. <code>std::string</code>), you should check the project settings on all linked libraries and the app-project itself. They usually need to match!</p> <p>The original ScanTest (which builds ZXingWidget as a subproject) uses the following settings and those need to match your App build-settings if you use the library as is.</p> <p>For making sure, I created a brand-new project using Xcode 4.5. That project uses ZXingWidget as a prebuilt library but not as a subproject - I dont like subprojects for stuff that is not my own - though this specialty wont influence the results.</p> <p>The important setting is <strong><em>C++ Standard Library</em></strong> - make sure that is set towards <strong><em>Compiler Default</em></strong></p> <p><img src="https://i.stack.imgur.com/jxPvG.png" alt="enter image description here"> </p> <hr> <p><em>Little clarification</em></p> <p>Actually, you do not need to use <strong><em>C++ Standard Library</em></strong>, you may as well use <strong><em>LLVM C++ standard library with C++11 support</em></strong>. <strong>But</strong> you will have to use that exact same library in all projects, sub-projects and libraries that link with your project. So if you insist on using the more recent version of that library (C++11 support), then you will have to build the ZXing library with those settings as well.</p> <hr> <p>Last but not least, make sure your <strong><em>Architectures</em></strong> and <strong><em>Valid Architecture</em></strong> settings are matching over all projects and sub projects (fixing the common <code>armv7s</code> linker issue). </p> <p>First, make sure your <strong><em>Architectures</em></strong> setting is set towards <code>armv7</code> <code>armv7s</code> within all projects. Then also edit the project settings of all projects towards <strong><em>Valid Architecture</em></strong> <code>armv7s</code> <code>armv7</code>. </p> <p><img src="https://i.stack.imgur.com/ASeo8.png" alt="enter image description here"></p>
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    1. COthis is good for simulator; but still problem when building for a device: Undefined symbols for architecture armv7s: "_OBJC_CLASS_$_ZXingWidgetController", referenced from
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    2. COSee my edited answer.
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    3. COTill - thank you so much! this question is pretty common in zxing community now; your screenshots will save lot's of time; thanks again
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