@protocol VideoWorker <NSObject>
 
@required
 
@property (nonatomic) float progress;
@property (nonatomic) BOOL done;
 
-(void)beginWorking;
 
@end
 
@interface LoadingVC : UIViewController <UIAlertViewDelegate>
...
@end

然后在BlurWorkerGPU.h中

...
#import "LoadingVC.h"
 
@interface BlurWorkerGPU  : NSObject <VideoWorker> {
...
}
- (void)beginWorking;
@property(nonatomic)float progress;
@property(nonatomic)BOOL done;
 ...
@end

然而,llvm说

“No type or protocol named ‘VideoWorker'”

这很奇怪,因为我正在导入定义协议的标头.有线索吗？