objective-c – 错误：预期;在声明列表的末尾 – 类未被识别为类

#import <UIKit/UIKit.h>
#import <CoreData/CoreData.h>
#import <CoreLocation/CoreLocation.h>
#import <AVFoundation/AVFoundation.h>
#import <CoreMedia/CoreMedia.h>
#import <ImageIO/ImageIO.h>
#import <CoreVideo/CoreVideo.h>


@interface ViewController : UIViewController <UINavigationControllerDelegate,CLLocationManagerDelegate>

@property (nonatomic,strong) NSManagedObjectContext *managedObjectContext;
@property(nonatomic,weak) IBOutlet UIImageView *selectedImageView;
@property(nonatomic,retain) IBOutlet UIImageView *vImage;
@property(nonatomic,retain) AVCaptureStillImageOutput????? *stillImageOutput;

- (IBAction)photoFromAlbum;
- (IBAction)photoFromCamera;
- (IBAction)saveImageToAlbum;
- (IBAction)segueToChoosePhotoTypeViewController;

@end

这条线：

@property(nonatomic,retain) AVCaptureStillImageOutput????? *stillImageOutput;

正在产生以下问题：

Expected ; at end of declaration list.

Xcode没有将AVCaptureStillImageOutput识别为类,因为它仍然是黑色并且不建议它作为类型,并且“Fix-it”想要插入;就在AVCaptureStillImageOutput之后.

但是,如果我尝试使用声明AVCaptureStillImageOutput作为我的viewController.m文件的viewDidLoad中的类型,它会识别它并允许它作为类型.此外,其余的AVFoundation类在那里的代码中被识别.

框架在那里,我只是遇到了这个@property声明的问题.