Question

I cannot seem to build my protocol the way I would like and I have narrowed down to a problem with using derived classes. If I use a cocoa class it seems to work. Here is what I have…

#import <Foundation/Foundation.h>
#import "MyView.h"

@protocol MyDelegate  
- (void)view:(MyView *)aView didDoSomethingWithString:(NSString *)string;
@end

The MyView class is…

#import <UIKit/UIKit.h>
@interface MyView : UIView {  
    NSString *whatever;  
}  
- (void)myMethod;  
@end  

@implementation MyView  
- (void)myMethod {  
 doSomething...  
}  
@end

So when I attempt to build I get the error “Expected ‘)’ before ‘MyView'”. If I replace the custom class MyView with UIView then the code compiles. I am hoping someone sees something that I am overlooking. Any ideas are appreciated.

Thanks.

Answer 1

Are you sure MyView.h contains @interface MyView : UIView?

Also, instead of importing you can use @class. e.g.

@class MyView;
@protocol MyDelegate
- (void)view:(MyView *)aView didDoSomethingWithString:(NSString *)string;
@end