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Alex Rivera
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My idea is very similar to declare a variable of an interface type in java. So for example, header file 1: @protocol Calculator @end I then define an @interface CalculatorImpl which implements the above Calculator protocol. In header file 2: @interface SomeViewController : UIViewController { } @property (weak, nonatomic) IBOutlet UITextField *txtResult; @property (weak, nonatomic) Calculator* calculator; @end However, the xcode will flag an error at the calculator line property with 'weak' attribute must be of object type Is this usage of protocol disallowed by objective-c?
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