通知触发器中的错误。斯威夫特

Question

我创建一个本地通知，它应该每天上午9点来。我以前也这么做过，而且成功了。由于某种原因，它会产生以下错误.

请告诉我如何正确地解决这个问题！

     let date = Date()
    var triggerDate = 
Calendar.current.dateComponents([.hour,.minute,.second,], from: 
date)
    triggerDate.hour = 9
      triggerDate.minute = 0
      triggerDate.second = 0

    let request = UNNotificationRequest(identifier: "Oneindifer", 
content: content, trigger: triggerDate) /*ERROR - Cannot convert 
value of type 'DateComponents' to expected argument type 
'UNNotificationTrigger?'*/

Answer 1

您需要做的是在UNNotificationTrigger参数中传递一个trigger。您目前正在传递DateComponents。尝试用以下代码替换代码：

let date = Date()
var triggerDate = Calendar.current.dateComponents([.hour,.minute,.second,], from: date)
triggerDate.hour = 9
triggerDate.minute = 0
triggerDate.second = 0

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

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

Alternatively:看一下这个UIViewController扩展的答案。它是一个让您轻松创建UNNotificationRequest：Send a local notification when timer is up的函数。

在您的例子中，您可以使用上面链接的答案中的扩展名，如：self.createLocalNotification(title: "9 hours have passed", hours: 9)

Answer 2

这是工作！

 let date = Date()
    var triggerDate = 
Calendar.current.dateComponents([.hour,.minute,.second,], from: 
date)
    triggerDate.hour = 9
      triggerDate.minute = 0
      triggerDate.second = 0

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

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