CODEWITHSUNDEEP
objective-c
Crystal
Crystal

Reputation: 29518

Conforming to protocols from categories in Objective-C

In Objective-C, why is it if you have a category for a class, and conform to a protocol in the category, why does the main class not know you conform to that category?

For example, some pseudo code

main class file

@implementation SessionManager

[SessionManager alloc] initWithDelegate:self]; // warning from Xcode saying that SessionManager is not the appropriate type

category file

@interface SessionManager (SomeCategory) <SessionManagerProtocol>

But if I just move the declaration of the conformance to the protocol in the main class file

@interface SessionManager : NSObject <SessionManagerProtocol>

The compiler does not generate a warning in that case. Is it just best to declare your conformance in the main class file?

Upvotes: 1

Views: 276

Answers (1)

trungduc
trungduc

Reputation: 12154

You need to import category .h file in main class .m file so that complier can know these methods were declared in class category and it won't show warning.

Upvotes: 1

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