tutorial我正在研究定义了以下方法。-(void)addBirdSightingWithSighting:(BirdSighting*)sighting{[self.masterBirdSightingListaddObject:sighting];}教程描述如下:ThismethodcreatesandinitializesanewBirdSightingobjectbysendingtotheinitWithName:location:date:methodthenameandlocationtheuserentered,alongwithtoday’sdate.Then,t