在iOS日历(Swift)中保存事件内部的唯一自定义标识符时需要帮助

import EventKit

func saveEventToCalendar() {
    let eventStore = EKEventStore()
    
    // 请求日历访问权限
    eventStore.requestAccess(to: .event) { (granted, error) in
        if granted && error == nil {
            let event = EKEvent(eventStore: eventStore)
            
            // 设置事件的属性
            event.title = "My Event"
            event.startDate = Date()
            event.endDate = Date().addingTimeInterval(3600)
            
            // 为事件分配一个唯一标识符
            let eventIdentifier = UUID().uuidString
            event.eventIdentifier = eventIdentifier
            
            // 保存事件到日历
            do {
                try eventStore.save(event, span: .thisEvent)
                print("Event saved successfully with identifier: \(eventIdentifier)")
            } catch {
                print("Failed to save event: \(error.localizedDescription)")
            }
        } else {
            print("Access to calendar denied")
        }
    }
}