在swift iOS中通过QR扫描仪扫描时如何在日历中添加事件

Question

在发布之前，我确实搜索过这个答案，但没有找到我需要的东西，所以想请问您是否可以帮助我。

我有 iOS Swift 应用程序，它扫描 QR 码，在我的情况下是日历事件，然后将其显示为警报弹出窗口。 我需要的是扫描二维码（日历事件），扫描时提示是否将事件添加到日历中，也限制扫描事件二维码。

有效的代码来自https://medium.com/@gayatri.hedau/qr-code-scanner-with-avcapturesession-ios-swift-5007ee498b49，但您可以在那里确认您已看到扫描信息。

在https://qrcode.tec-it.com/en/Calendar上创建带有活动信息的二维码

我不太了解，但我认为下面的代码应该调整一下，因为这部分显示了警报二维码。

   func receivedCode(qrcode: String) {
    print(qrcode)
    let alertController = UIAlertController(title: "Do you want to add event into your calendar?", message: qrcode, preferredStyle: .alert)
    let action1 = UIAlertAction(title: "Ok", style: .default) { (action:UIAlertAction) in
        self.dismiss(animated: true)
    }
    alertController.addAction(action1)
    self.present(alertController, animated: true, completion: nil)
}

当扫描二维码时，我得到了这个

开始：事件 摘要：学生会七月 描述：参加学生会议 地点：21号会议室 DTSTART:20190710T140000Z 结束：事件

当使用来自 AppStore 的类似 QR 码应用扫描仪进行扫描时，它会显示这是日历事件。

Answer 1

我通过操作二维码返回的字符串值找到了解决方案：

var aStr = codeString.replacingOccurrences(of: "BEGIN:VEVENT", with: "")
aStr = aStr.replacingOccurrences(of: "\n", with: "")
aStr = aStr.replacingOccurrences(of: "SUMMARY:", with: "")
aStr = aStr.replacingOccurrences(of: "LOCATION:", with: "_")
aStr = aStr.replacingOccurrences(of: "DTSTART:", with: "_")
aStr = aStr.replacingOccurrences(of: "DTEND:", with: "_")
aStr = aStr.replacingOccurrences(of: "END:VEVENT", with: "")
print("\nEVENT STRING: \(aStr)\n")

// Make an array of aStr items
let evArr = aStr.components(separatedBy: "_")
let startDateStr = "\(evArr[2])"
let endDateStr = "\(evArr[3])"

// Get dates from Strings
let df = DateFormatter()
df.locale = Locale(identifier: "en_US_POSIX")
df.timeZone = TimeZone.autoupdatingCurrent
df.dateFormat = "yyyyMMdd'T'HHmmss"
let startDate = df.date(from: startDateStr)
let endDate = df.date(from: endDateStr)

// Store Event in Calendar
let eventStore = EKEventStore()
eventStore.requestAccess(to: EKEntityType.event) { (granted, error) in
    if granted && error == nil {
        print("ACCESS GRANTED \(granted)")
        print("ERROR: \(String(describing: error))")

        let event = EKEvent(eventStore: eventStore)
        event.title = "\(evArr[0])"
        event.startDate = startDate!
        event.endDate = endDate!
        event.notes = "EVENT: \(evArr[0])\nLOCATION: \(evArr[1])"
        // Save Event...
        event.calendar = eventStore.defaultCalendarForNewEvents
        do { try eventStore.save(event, span: .thisEvent)
        } catch let error as NSError { print("Failed to save Event: \(error)") }

        print("Event saved in your Calendar app")
// error
} else { print("Failed to save Event: \(error!.localizedDescription)") }

请注意，此代码处理类型为 vEvent 的 QR 码，创建于 https://www.qrcode-monkey.com/#event。
但如果您在https://www.qrstuff.com 上创建事件，则该事件将是 vCalendar 事件类型，因此您需要以下代码将其保存到 iOS 日历应用程序：

var aStr = codeString.replacingOccurrences(of: "BEGIN:VCALENDAR", with: "")
aStr = aStr.replacingOccurrences(of: "VERSION:2.0", with: "")
aStr = aStr.replacingOccurrences(of: "BEGIN:VEVENT", with: "")
aStr = aStr.replacingOccurrences(of: "\n", with: "")
aStr = aStr.replacingOccurrences(of: "\r", with: "")
aStr = aStr.replacingOccurrences(of: "SUMMARY;CHARSET=utf-8:", with: "")
aStr = aStr.replacingOccurrences(of: "LOCATION;CHARSET=utf-8:", with: "_")
aStr = aStr.replacingOccurrences(of: "DTSTART:", with: "_")
aStr = aStr.replacingOccurrences(of: "DTEND:", with: "_")
aStr = aStr.replacingOccurrences(of: "END:VEVENT", with: "")
aStr = aStr.replacingOccurrences(of: "END:VCALENDAR", with: "")

// Make an array of aStr items
let evArr = aStr.components(separatedBy: "_")
let startDateStr = "\(evArr[2])"
let endDateStr = "\(evArr[3])"

// Get dates from Strings
let df = DateFormatter()
df.locale = Locale(identifier: "en_US_POSIX")
df.timeZone = TimeZone.autoupdatingCurrent
df.dateFormat = "yyyyMMdd'T'HHmmssZ"
let startDate = df.date(from: startDateStr)
let endDate = df.date(from: endDateStr)

// Store Event in Calendar
let eventStore = EKEventStore()
eventStore.requestAccess(to: EKEntityType.event) { (granted, error) in
    if granted && error == nil {
         print("ACCESS GRANTED \(granted)")
         print("ERROR: \(String(describing: error))")

         let event = EKEvent(eventStore: eventStore)
         event.title = "\(evArr[0])"
         event.startDate = startDate!
         event.endDate = endDate!
         event.notes = "EVENT: \(evArr[0])\nLOCATION: \(evArr[1])"

         // Save Event...
         event.calendar = eventStore.defaultCalendarForNewEvents
         do { try eventStore.save(event, span: .thisEvent)
         } catch let error as NSError { print("Failed to save Event: \(error)") }
         print("This Event has been saved in your Calendar app")

// error
} else { print("Failed to save Event: \(error!.localizedDescription)") }