无法找到“MFMailComposeViewControllerDelegate”的协议声明;你的意思是“UIPageViewControllerDelegate”?

This code :

这段代码:

#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#import <MessageUI/MessageUI.h>
#import "MessageComposerViewController.h"
#import <MessageUI/MFMailComposeViewController.h>

@interface MapViewController : UIViewController <MFMailComposeViewControllerDelegate> // Add the delegate

- (IBAction)showEmail:(id)sender;

{
    IBOutlet MKMapView *mapView;
}

@property (nonatomic, retain) MKMapView *mapView;

@end
#import <UIKit/UIKit.h>
#