iphone - 找不到协议(protocol)声明 MKAnnotation

Question

代码是:

@interface RouteMapAnnotation : NSObject <MKAnnotation> 
{    
    CLLocationCoordinate2D  coordinate;
    NSString*               title;
    NSString*               subtitle;
}

@property (nonatomic, readonly) CLLocationCoordinate2D coordinate;
@property (nonatomic, copy) NSString* title;
@property (nonatomic, copy) NSString* subtitle;

@end

这是我遇到的错误的快照:

https://skitch.com/kuntul/rws3c/smartrek-routemapannotation.h

怎么了？我在同一个项目上完成了这个并且它有效..

Answer 1

你记得吗#import <MapKit/MapKit.h> ？