这是我的代码:NSString*calID=[[NSUserDefaultsstandardUserDefaults]objectForKey:@"calendarIdentifier"];EKCalendar*cal=[eventStorecalendarWithIdentifier:calID];//Ifcalendarexistsif(cal){//RetrieveallexistingeventsuntiltodayNSPredicate*predicate=[eventStorepredicateForEventsWithStartDate:[NSDatedistantPas