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POCheck if framework has been added during compile time - iOS
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copied!<p>I'm currently working on a project that has a class referencing the Security.h framework. Since this is a reusable class, and might be used in multiple projects, I wish to add a compile time check to <strong>check whether the Security framework has been added to the project</strong> or not. What I mean by added to the project is whether it has been added in the <strong>Link Binary With Libraries</strong> build phases for the current target.</p> <p>Now, I know that questions with similar titles have been asked multiple times, and <a href="https://stackoverflow.com/questions/15642067/check-for-frameworks-existence-at-compile-time">this particular question</a> seemed to be super close to what I'm looking for, but I did not find an answer there either.</p> <p>I've been using:</p> <pre><code>#ifdef __SENTINEL_VALUE_ ..conditional code here.. #endif </code></pre> <p>code, but this <strong>only</strong> works if the framework header declares the sentinel value in the main header. Let me provide two examples to compare and contrast:</p> <p><code>SystemConfiguration.framework</code> has a framework header <code>SystemConfiguration.h</code> which includes all the sub headers, but also declares its own sentinel value, namely <code>_SYSTEMCONFIGURATION_H</code></p> <p>Thus, checking it using <code>#ifdef _SYSTEMCONFIGURATION_H</code> works perfectly. However, for <code>Security.framework</code>, the framework header, <code>Security.h</code> does not declare its own sentinel value. Each of its sub headers declare their own sentinel value, but since they are being imported in <code>Security.h</code>, the sentinel value gets <strong>defined</strong>. Therefore, even if <code>Security.framework</code> is not included in the project (not linked in the build phases), an <code>#ifndef</code> for one of its sub headers returns a false value, since the sentinel value is defined owing to its import in the <code>Security.h</code> file (not to mention that this approach of checking for a sub header of a framework header makes me feel a little sad).</p> <p>So, my question is: For a unique case like <code>Security.framework</code>, what would be the appropriate <strong>compile time</strong> check to check whether the framework has been added to the <strong>Link Binary With Libraries</strong> phase (if such a check exists).</p> <p>Additionally, I know of the <code>NSClassFromString()</code> method and the <code>NS_CLASS_AVAILABLE</code> macros, but I'm not looking for a run-time solution.</p> <p>Thanks in advance all!</p> <p>Cheers!</p>

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