保存的事件未显示在Calendar.app中

我正在尝试在macOS 10.14上使用Swift 4创建日历事件

self.eventStore.requestAccess(to: .event, completion: { (granted, error) in
    print(granted)
})

然后我尝试创建一个事件:

let event = EKEvent(eventStore: self.eventStore)
event.title = "Help me SO"
event.startDate = Date()
event.endDate = Calendar.current.date(byAdding: .hour, value: 1, to: Date())
event.calendar = self.eventStore.defaultCalendarForNewEvents
do {
    try eventStore.save(event, span: .thisEvent, commit: true)
} catch let error as NSError { //This is never called
    print("failed to save event with error : \(error)") 
}
print("Saved Event") //This prints

没有 是 被创造和储存,只是没有表现出来。