[Solved] What exactly the first argument `identifier` in Objective-C? [closed]

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identifier parameter is a string you need to compare to. For example: 

NSString* yourString = @"Hello"; 
BOOL match = [yourString isEqualToString: @"aString"]; //currently returns NO

//handle match value according to your needs, e.g with if-else syntax.  
if (match) { 
    //YES flow
}
else {
    //NO flow
}

where @"aString" is a method parameter, named as identifier (in your case) to be used in isEqualToString API’s implementation of Foundation framework.

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solved What exactly the first argument `identifier` in Objective-C? [closed]