每周触发通知 Swift 3

Question

我正在尝试制定一个时间表，其中我需要记住我上课的所有星期，例如星期一的某个时间。问题是，如果我在打印变量 triggerWeekly 时指定 weekday = 1（星期日），它会告诉我 weekday = 2，因此通过执行测试我不会收到此类通知。我需要知道为什么会发生这种情况

let weekday = 1 //Sunday 19 Mar 
let calendar = NSCalendar.current
var date = DateComponents()
date.weekday = weekday
date.hour = 1
date.minute = 5

let ultimateDate = calendar.date(from: date)

let triggerWeekly = Calendar.current.dateComponents([.weekday, .hour, .minute], from:
ultimateDate!)

print(triggerWeekly) // hour: 1 minute: 5 second: 0 weekday: 2 isLeapMonth: false 
let trigger = UNCalendarNotificationTrigger(dateMatching: triggerWeekly, repeats: true)
let identifier = "curso\(String(Index))"
let request = UNNotificationRequest(identifier: identifier,
                                        content: content, trigger: trigger)

Answer 1

您可以将触发器设置为每周一凌晨 1:05 重复，如下所示：

import UserNotifications

let trigger = UNCalendarNotificationTrigger(dateMatching: DateComponents(hour: 1, minute: 5, weekday: 2), repeats: true)
print(trigger.nextTriggerDate() ?? "nil")

let content = UNMutableNotificationContent()
content.title = "title"
content.body = "body"
// make sure you give each request a unique identifier. (nextTriggerDate description)
let request = UNNotificationRequest(identifier: "identify", content: content, trigger: trigger)
UNUserNotificationCenter.current().add(request) { error in
    if let error = error {
        print(error)
        return
    }
    print("scheduled")
}

在尝试安排通知之前，不要忘记询问用户安排通知的权限：

UNUserNotificationCenter.current().requestAuthorization(options:[.badge, .alert, .sound]) { granted, error in
    if granted {
        print("authorized")
    }
}