实现文件看不到协议委托

Question

在头文件中声明了一个协议，但是实现文件说它不能看到委托。为什么?

Xcode编译器消息在实现文件中被注释掉。

提前感谢。

AddItemViewController.h

#import <UIKit/UIKit.h>
@class AddItemViewController;
@class ChecklistItem;
@protocol AddItemViewControllerDelegate <NSObject>
- (void)addItemViewControllerDidCancel:(AddItemViewController *)controller;
- (void)addItemViewController:(AddItemViewController *)controller didFinishAddingItem:(ChecklistItem *)item;
@property (nonatomic, weak) id <AddItemViewControllerDelegate> delegate;
@end
@interface AddItemViewController : UITableViewController <UITextFieldDelegate>
@property (weak, nonatomic) IBOutlet UITextField *textField;
@property (weak, nonatomic) IBOutlet UIBarButtonItem *doneBarButton;
- (IBAction)cancel;
- (IBAction)done;
@end

AddItemViewController.m

- (IBAction)cancel
{
    [self.delegate addItemViewControllerDidCancel:self]; /* Semantic issue: Property 'delegate' not found on object of  type     "AddItemViewController" */
}
- (IBAction)done
{
    ChecklistItem *item = [[ChecklistItem alloc] init];
    item.text = self.textField.text;
    item.checked = NO;
    [self.delegate AddItemViewController:self didFinishAddingItem:item]; /* Semantic issue: Property 'delegate' not found on object of  type     "AddItemViewController" */
}

Answer 1

是打错字了吗?委托属性在委托协议上定义。当然VC类是看不到的;)