设计模式

#import <UIKit/UIKit.h>
@class MJFoodTypesViewController, MJFoodType;

@protocol MJFoodTypesViewControllerDelegate <NSObject>
@optional
- (void)foodTypesViewController:(MJFoodTypesViewController *)foodTypesVc didSelectedFoodType:(MJFoodType *)type;
@end

@interface MJFoodTypesViewController : UITableViewController
@property (weak, nonatomic) id<MJFoodTypesViewControllerDelegate> delegate;
@end

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    if ([self.delegate respondsToSelector:@selector(foodTypesViewController:didSelectedFoodType:)]) {
        MJFoodType *foodType = self.foodTypes[indexPath.row];
        [self.delegate foodTypesViewController:self didSelectedFoodType:foodType];
    }
}