1
在这个类中,有下列代码的SeismicXMLAppDelegate实现文件:苹果SeismicXML示例应用
// forward declarations
@interface SeismicXMLAppDelegate()
@property (nonatomic, retain) NSURLConnection *earthquakeFeedConnection;
@property (nonatomic, retain) NSMutableData *earthquakeData; // the data returned from the NSURLConnection
@property (nonatomic, retain) NSOperationQueue *parseQueue; // the queue that manages our NSOperation for parsing earthquake data
- (void)addEarthquakesToList:(NSArray *)earthquakes;
- (void)handleError:(NSError *)error;
@end
为什么他们在实现文件的第二接口?