With ARC and iPhone Simulator 5.0 the following seems to work just fine (no warnings, etc…): SomeObject.h @class SomeObject; @protocol SomeObjectDelegate <NSObject> - (void)someObjectDidFinishDoingSomethingUseful:(SomeObject *)object; @end @interface SomeObject : NSObject { __unsafe_unretained id <SomeObjectDelegate> _delegate; } @property (nonatomic, assign) id <SomeObjectDelegate> delegate; @end SomeObject.m #import "SomeObject.h" @implementation SomeObject @synthesize delegate = _delegate; @end
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