檢查日曆中是否存在事件 - Swift

我試圖檢查日曆中是否存在事件，並顯示它存在的警報。這是我的代碼檢查日曆中是否存在事件 - Swift

編輯：它不斷添加重複事件。

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") 
}

來源

2017-08-14 Humayun Khan

會發生什麼？你有錯誤，或者根本沒有數據？它工作正常嗎？描述你所看到的內容以及它與你的期望有什麼不同，這很重要 - 這通常使我們更容易提供幫助 - 我們無法分辨你在這裏提出的問題。 – Petesh

它只是不斷添加重複的事件到日曆。 –

問題是，即使事件存在，您添加事件的do-catch塊也會始終被調用。您需要創建一個布爾值來跟蹤是否找到相同的事件，並且只有在未找到該塊時才執行do-catch塊。

只要找到第一個匹配事件，您也可以打開循環。

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") 
    } 
}

來源

2017-08-14 12:42:19

它仍然添加重複的事件。 –

你是否檢查if語句是否被執行？ –

謝謝。它正在工作。在其他方法中做了一件愚蠢的事情，因爲它與開始和結束日期不匹配。 –

檢查日曆中是否存在事件 - Swift

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