イベントがカレンダーに存在するかどうかを確認する - スウィフト

Question

イベントがカレンダーに既に存在するかどうかを確認し、存在することを警告します。これは私のコードです

編集：それは重複イベントを追加し続けます。

let event = EKEvent(eventStore: eventStore) 
var savedEventId : String = "" 
event.title = title 
event.startDate = (self.dataEvent?.dates?.begin)! 
event.endDate = (self.dataEvent?.dates?.end)! 
event.calendar = eventStore.defaultCalendarForNewEvents 
let predicate = eventStore.predicateForEventsWithStartDate(startDate, endDate: endDate, calendars: nil) 
let existingEvents = eventStore.eventsMatchingPredicate(predicate) 
for singleEvent in existingEvents { 
    if singleEvent.title == self.dataEvent?.titleString && singleEvent.startDate == startDate && singleEvent.endDate == endDate { 
     let alert = UIAlertController(title: "Event Already Exists", message: "Event Already Exists in Calendar", preferredStyle: UIAlertControllerStyle.Alert) 
     alert.addAction(UIAlertAction(title: "Close", style: UIAlertActionStyle.Default, handler: nil)) 
     self.presentViewController(alert, animated: true, completion: nil) 
    } 
} 
do { 
    try eventStore.saveEvent(event, span: .ThisEvent) 
    savedEventId = event.eventIdentifier 
    print("Event Added") 
    let alert = UIAlertController(title: "Event Successfully Added", message: "Event Added to Calendar", preferredStyle: UIAlertControllerStyle.Alert) 
    alert.addAction(UIAlertAction(title: "Close", style: UIAlertActionStyle.Default, handler: nil)) 
    self.presentViewController(alert, animated: true, completion: nil) 
} catch { 
    print("Error occurred") 
} 

Answer 1

問題は、イベントを追加するあなたのdo-catchブロックは、イベントが存在する場合でも、すべての時間を呼び出されるということです。ブール値を作成して、同じイベントが検出されたかどうかを追跡し、ブロックが見つからなければdo-catchブロックのみを実行する必要があります。

最初に一致するイベントが見つかるとすぐにループを解除することもできます。

var eventAlreadyExists = false 
let event = EKEvent(eventStore: eventStore) 
var savedEventId : String = "" 
event.title = title 
event.startDate = (self.dataEvent?.dates?.begin)! 
event.endDate = (self.dataEvent?.dates?.end)! 
event.calendar = eventStore.defaultCalendarForNewEvents 
let predicate = eventStore.predicateForEventsWithStartDate(startDate, endDate: endDate, calendars: nil) 
let existingEvents = eventStore.eventsMatchingPredicate(predicate) 
for singleEvent in existingEvents { 
    if singleEvent.title == self.dataEvent?.titleString && singleEvent.startDate == startDate && singleEvent.endDate == endDate { 
     eventAlreadyExists = true 
     let alert = UIAlertController(title: "Event Already Exists", message: "Event Already Exists in Calendar", preferredStyle: UIAlertControllerStyle.Alert) 
     alert.addAction(UIAlertAction(title: "Close", style: UIAlertActionStyle.Default, handler: nil)) 
     self.presentViewController(alert, animated: true, completion: nil) 
     break 
    } 
} 
if !eventAlreadyExists { 
    do { 
     try eventStore.saveEvent(event, span: .ThisEvent) 
     savedEventId = event.eventIdentifier 
     print("Event Added") 
     let alert = UIAlertController(title: "Event Successfully Added", message: "Event Added to Calendar", preferredStyle: UIAlertControllerStyle.Alert) 
     alert.addAction(UIAlertAction(title: "Close", style: UIAlertActionStyle.Default, handler: nil)) 
     self.presentViewController(alert, animated: true, completion: nil) 
    } catch { 
     print("Error occurred") 
    } 
}