What is wrong with this code?

@protocol MyViewDelegate <NSObject>
- (void) didFinishProcessing:(MyView*)myView; //compiler stops here with error
@end

@interface MyView : MySuperclass {

id<MyViewDelegate> _delegate;       
}

@property (nonatomic, retain) id<MyViewDelegate> delegate;

@end

When I try to compile I get " expected ')' before MyView开发者_C百科 ". Where is the error?

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Before @protocol add the line @class MyView. At that point the compiler doesn't yet know about your MyView class.

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MyView is not recognized by the compiler, which is why it expected a close paren before it. This is because the class is defined below the MyViewDelegate protocol, so the compiler has not yet seen it. Add

@class MyView;

above the protocol declaration to fix it.