如何使用eventkit处理重复事件

Question

我从Web服务收到一些事件。我使用Eventkit以编程方式添加这些事件。我有一个Add按钮，它调用代码来添加收到的事件。但是，重复添加操作会复制事件而不是合并（如果事件已存在）。

如何避免重复事件？

Answer 1

您必须在添加之前检查现有事件。以下代码显示了如何执行此操作。我已经检查了标题并单独开始日期以识别事件，您可以根据需要使用更多参数。

EKEventStore *eventStore = [[EKEventStore alloc] init];
NSPredicate *predicate = [eventStore predicateForEventsWithStartDate:[startDate dateByAddingTimeInterval:-60]
                                                             endDate:[endDate dateByAddingTimeInterval:60] calendars:nil];
    NSArray *events = [eventStore eventsMatchingPredicate:predicate];
    bool found = NO;
    for ( EKEvent *evt in events )
    {
        if ( [evt.title isEqualToString:title]  && [evt.startDate isEqualToDate:startDate])
        {
            found = YES;                
            break;
        }
    }
if(!found)
{
//Add your event here.
}

Answer 2

即使我遇到重复事件问题，同时向日历添加事件。所以在添加事件之前，我首先通过在谓词中传递开始和结束日期来删除它们，如下所示。

    func removeMobileCalendarEvents(){
    //lstEvents is response array which i got from web service and stored in model class
    for eventObj in lstEvents.list {

        let predicate = eventStore.predicateForEvents(withStart: eventStartDate, end: eventEndDate, calendars: nil)

        let events = eventStore.events(matching: predicate)

        for event in events {
            print("event title",event.title)
            print("event start date",event.startDate)
            print("event end date",event.endDate)
            //lstEvents is response array which i got from web service and stored in model class
            for eventObj in lstEvents.list {
                if event.title! == eventObj.EventName { 
                    //exists

                    do {
                        try eventStore.remove(event, span: .thisEvent, commit: true)
                    }
                    catch {
                        print("Error saving event in calendar")             }

                }else{
                    //not exists
                }
            }

        }
    }

    addingEventsToMobileCalendar()

}

收到Web服务的响应后，调用removeMobileCalendarEvents（）方法。调用removeMobileCalendarEvents（）方法，那些api被调用的次数很多。