ios - 如何安排一周中特定两天的本地通知？

Question

我想安排每周触发两次通知:

let gregorian = Calendar(identifier: .gregorian)
let now = Date()

[2, 4].forEach { day in 
    let content = UNMutableNotificationContent()
    content.title = "Notif title"
    content.body = "Comment"
    content.sound = .default
    var components = gregorian.dateComponents([.year, .month, .weekdayOrdinal, .day, .hour, .minute, .second], from: now)
    components.hour = 11
    components.minute = 25
    components.second = 0
    components.weekdayOrdinal = day

    let date = gregorian.date(from: components)!
    let triggerDaily = gregorian.dateComponents([.weekdayOrdinal, .hour, .minute, .second], from: date)
    let trigger = UNCalendarNotificationTrigger(dateMatching: triggerDaily, repeats: true)
    let request = UNNotificationRequest(identifier: "test", content: content, trigger: trigger)
    UNUserNotificationCenter.current().add(request) { error in
        if let error = error {
            print("Oops: \(error)")
        } else {
            print("Notification created!")
        }
    }
}

但是它不是在星期一和星期三被解雇一次，而是每天被调用两次。

我做错了什么？感谢您的帮助。

Answer 1

由于 foreach 循环，您的代码会安排两个具有相同标识符的通知。当您的代码正在执行第二个循环时覆盖请求。

我进行了一些研发并稍微改进了您的代码。在我这边，它工作得很好。

请尝试下面提到的代码。

func setNotification() {
    let days = [2,4]

func ScheduleNotification(index:Int){
    let calendarComponents = NSDateComponents()
    calendarComponents.hour = 11
    calendarComponents.minute = 25
    calendarComponents.second = 0
    calendarComponents.weekday = days[index]

    let content = UNMutableNotificationContent()
    content.title = "Notification title"
    content.body = "your message here."
    content.sound = UNNotificationSound.default

    let trigger = UNCalendarNotificationTrigger(dateMatching: calendarComponents as DateComponents, repeats: true)
    let identifier = "UYLLocalNotification\(days[index])"
    let request = UNNotificationRequest(identifier: identifier, content: content, trigger: trigger)

    UNUserNotificationCenter.current().add(request, withCompletionHandler: { (error) in
        if let error = error {
            print(error)
        }else{
            if index == 0{
                ScheduleNotification(index: 1)
            }
        }
    })
}
ScheduleNotification(index: 0)
}

在您的 viewdidLoad 方法中调用此函数。

self.setNotification()

我希望它能节省您的时间。