Property type 'id' is incompatible with type 'id' inherited from 'UIToolbar' warning

Question

I just installed xcode 5 and I'm now receiving this warning. I've never seen it before. My app runs fine, but I hate seeing a warning. Does anyone know what this is and how to fix it? Thanks

Property type 'id' is incompatible with type 'id' inherited from 'UIToolbar'

Answer 1

It is hard to tell from the lack of context, but this appears to be a duplicate of Syntax for resolving incompatible property type on inherited delegate

The problem is likely that you are creating a new property with the same name but with different protocols attached.

For example, UIToolBar has the following property:

@property(nonatomic, assign) id<UIToolbarDelegate> delegate;

If you were to declare the below in your class, it would generate this warning because the two properties have different protocols:

@property(nonatomic, assign) id<MyBetterDelegate> delegate;

There are two ways to solve this. You could modify your protocol to inherit from the other protocol:

@protocol MyBetterDelegate<UIToolbarDelegate>
...

Or you could modify your property definition to capture both protocols:

@property(nonatomic, assign) id<MyBetterDelegate, UIToolbarDelegate> delegate;