未找到协议声明

Question

所以我有一个班级CommentViewController.h我有

#import "FirstViewController.h"

@protocol CommentViewControllerDelegate;

@interface CommentViewController : UIViewController {
id <CommentViewControllerDelegate> delegate;
}

 @property (nonatomic, assign) id <CommentViewControllerDelegate> delegate;

- (IBAction)submit:(id)sender;

-(IBAction)cancel:(id)sender;

 @end

@protocol CommentViewControllerDelegate
-(void)commentViewControllerDidFinish:(CommentViewController *)controller;
@end

我在实现中合成了委托

我尝试访问FirstViewController.h中的协议：

 #import "CommentViewController.h"
 @interface FirstViewController : UIViewController <CommentViewControllerDelegate>

植入FirstViewController：

 - (void)commentViewControllerDidFinish:(CommentViewController *)controller {
 [self dismissModalViewControllerAnimated:YES];
 }

此行显示错误：

@interface FirstViewController : UIViewController <CommentViewControllerDelegate>

错误：Cannot find protocol declaration for 'CommentViewControllerDelegate'; did you mean 'UISplitViewControllerDelegate'?

我错过了什么吗？我总是遇到协议和代理问题。

Answer 1

您的包含文件中有一个循环。

从CommentViewController.h

中删除此行

#import "FirstViewController.h"

它没有在头文件中引用，如果是，你可以简单地把：

@class FirstViewController;

而不是包含整个文件。