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Asked: 2026-06-01T15:05:52+00:00

I’m trying to force all implementers of a protocol to implement a readonly property.

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I’m trying to force all implementers of a protocol to implement a readonly property. This is my attempt:

@protocol Foo
@property(readonly) BOOL isPending;
@end

@interface Bar <Foo>
@end

@implementation Bar
- (BOOL) isPending {
    return NO;
}
@end

Why am I getting a warning in in the protocol file?

Property ‘isPending’ requires method ‘isPending’ to be defined

It’s a protocol! Protocols are not supposed to implement the functions! The classes who implement the protocol should implement the functions, which is exactly what I did.

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1 Answer

  1. Editorial Team

    I’m unable to reproduce the problem you’re reporting under Xcode 4.3.2. Is it possible you’ve declared something to implement Foo but neglected to add a getter to it for isPending? A diagnostic might be to add - (BOOL) isPending to the protocol in place of the @property and see if there’s any difference. You can still use dot syntax even with fully declared getters and setters so it shouldn’t make a syntactic difference to any other part of your program.

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