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在這個類中,有下列代碼的SeismicXMLAppDelegate實現文件:蘋果SeismicXML示例應用
// 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
爲什麼他們在實現文件的第二接口?