iOS 10 UserNotification框架。日历触发器

Question

我使用的是iOS 10.3.2 Beta4和Xcode8.3.2。我尝试每天同时发出通知，但通知似乎从未发出过。如果我不使用日历触发器，而使用时间间隔触发器，它们将按预期工作。

以下是我的代码

let content = UNMutableNotificationContent()
    content.title = "Daily Notification"
    content.subtitle = ""
    content.body = NSLocalizedString("Hello I am a notification", comment: "Comment")
    content.badge = 1
    content.sound = UNNotificationSound.default()

    let calendar = Calendar.current
    var dateComponents = calendar.dateComponents([.day, .month, .year, .hour], from: Date())
    dateComponents.hour = 14
    dateComponents.minute = 55

    let trigger = UNCalendarNotificationTrigger(dateMatching: dateComponents, repeats: false)

    NSLog("Setting daily notification - \(dateComponents)")

    let request = UNNotificationRequest(identifier: "dailyWarning", content: content, trigger: trigger)

    center.add(request, withCompletionHandler: { error in

        if error != nil {
            NSLog("Error occurred")
        } else {
            NSLog("Request added successfully: %@", request)
        }
    })

Answer 1

尝试像这样创建触发器：

var dateComponents = DateComponents()
dateComponents.hour = 14
dateComponents.minute = 55
let trigger = UNCalendarNotificationTrigger(dateMatching: dateComponents, repeats: true) // Setting repeats to true will trigger the notification daily

有关为什么只提供hour和minutes就足够了的更多信息，请参阅文档found here中的清单1中的解释。