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1) en el .h:
@protocol ResultViewDelegate <NSObject>

@optional
- (void) shareFacebookPressed:(ResultView *)v;
    
2) en el .m: 

-(IBAction) onShareFacebook: (id) sender{
    if ([self.delegate respondsToSelector:@selector(shareFacebookPressed:)]) {
        [self.delegate shareFacebookPressed:self];
    }
    
}