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POPotentially simple Objective C bug with a protocol
 

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  1. POPotentially simple Objective C bug with a protocol
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    <p>This might be a super simple bug, but my eyes are practically bleeding from trying to hunt it down. At first, I thought ARC might be playing a role, but now its completely disabled, and I'm still getting the bug.</p> <p>I have a UMLLanguageProtocol protocol which defines a static method</p> <pre><code>+(NSArray *)methodFormatComponents; </code></pre> <p>I am trying to call that method within a function, but it is not being recognized by Xcode ("no known class method selector").</p> <p>Here is the code where I am trying to use it:</p> <pre><code>#import "UMLLanguageProtocol.h" @implementation UMLMethod @dynamic documentation; @dynamic name; @dynamic umlClass; +(void)validPortionOfMethod:(NSString *)method inLanguage:(Class&lt;UMLLanguageProtocol&gt;)language { [language methodFormatComponents]; &lt;-- Error: No known class method selector } @end </code></pre> <p>and the protocol itself, defined in UMLLanguageProtocol.h</p> <pre><code>#import &lt;Foundation/Foundation.h&gt; #define VISIBILITY_SPECIFIER_COUNT 6 @class UMLMethod; @class UMLAttribute; @class UMLParameter; typedef enum { PUBLIC, PRIVATE, PROTECTED, PACKAGE, DERIVED, STATIC } visibility; @protocol UMLLanguageProtocol /* * Language Specifiers */ +(NSArray *)nativeDataTypes; // Return a 6 item array with YES if the language supports that visibility // specifier at the given index, and no if it doesn't. +(NSArray*)visibilitySpecifiersForVariables; +(NSArray*)visibilitySpecifiersForMethods; /* * Parsing Methods */ // Returns a regex string that defines a validly formatted method +(NSString *)methodFormat; +(NSArray *)methodFormatComponents; @optional +(NSString*)documentationCommentFromText:(NSString*)comment; +(NSString*)scaffoldTextFromMethod:(UMLMethod*)method; +(NSString*)scaffoldTextFromParameter:(UMLParameter *)parameter; +(NSString*)scaffoldTextFromAttribute:(UMLAttribute*)attribute; +(NSArray *)additionalCommonDataTypes; +(NSString *)defaultRootObject; @end </code></pre> <p>Seriously, I'm losing hair as I write this... please help!</p> <hr> <p>UPDATE: Actually, it seems the error is in two parts in the issue navigator. The first part is "Automatic Reference Counting Issue" and the second line is "No known class method for selector". That's odd, what could this possibly have to do with ARC?!</p>
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    1. COHave you inspected the language argument that is being passed into `validPortionOfMethod` and confirmed that the class does indeed implement the `methodFormatComponents` class method? Also, try changing to `inLanguage:(id)language` instead of `inLanguage:(Class<UMLLanguageProtocol>)language`
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      1. POPotentially simple Objective C bug with a protocol
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    2. COI can't reproduce this. I seem to be able to do exactly what you're doing perfectly fine with no errors. Care to share your compiler command line to see if there's any differences?
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      1. POPotentially simple Objective C bug with a protocol
      1. USmattjgalloway
    3. CO@Jeremy if he does that, he will also have to change how he calls the methodFormatComponents method. FWIW, I can add the UMLLanguageProtocol.h file to a project and then stick your validPortionOfMethod method in another class (e.g. AppDelegate) and it compiles just fine for me.
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      1. POPotentially simple Objective C bug with a protocol
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