objective-c – warning：忽略’…’的重复协议定义

warning: duplicate protocol definition of ‘…’ is ignored

我的协议声明在它自己的.h文件中,并且在我的项目中的一些其他文件中是#import’.

好吧,以防万一,这是带有协议声明的整个头文件：

#import <Foundation/Foundation.h> 

@class Wrapper;

@protocol WrapperDelegate

@required
- (void)wrapper:(Wrapper *)wrapper didRetrieveData:(NSData *)data;

@optional
- (void)wrapperHasBadCredentials:(Wrapper *)wrapper;
- (void)wrapper:(Wrapper *)wrapper didCreateResourceAtURL:(NSString *)url;
- (void)wrapper:(Wrapper *)wrapper didFailWithError:(NSError *)error;
- (void)wrapper:(Wrapper *)wrapper didReceiveStatusCode:(int)statusCode;

@end

谢谢你的建议.