我创建了一个功能，该功能会在您设置的特定时间和星期几发出警报。
func scheduleNotification() {
let center = UNUserNotificationCenter.current()
let hour = 6
let minute = 40
let weekdays = [2,3,4] // mon, tue, wed
let content = UNMutableNotificationContent()
content.title = "Fire!!"
content.body = "test.!"
content.badge = 1
content.categoryIdentifier = "alarm"
content.userInfo = ["customData": "fizzbuzz"]
content.sound = UNNotificationSound.default
for weekday in weekdays {
var dateComponents = DateComponents()
dateComponents.hour = hour
dateComponents.minute = minute
dateComponents.weekday = weekday
let trigger = UNCalendarNotificationTrigger.init(dateMatching: dateComponents, repeats: true)
let request = UNNotificationRequest(identifier: UUID().uuidString, content: content, trigger: trigger)
center.add(request)
center.getPendingNotificationRequests { (requests) in
for request in requests {
print("trigger : \(request.trigger)")
}
}
UNUserNotificationCenter.current().add(request) { (error) in
}
}
}
如您在上面的代码中看到的，您想重复的日子是星期一，星期二和星期三。
weekdays = [2,3,4]
之后，我想使用[2,3,4]数组上的for语句创建一个在星期一，星期二和星期三发出的警报。
但是警报没有按我想要的响。
我使用getPendingNotificationRequests方法将预定警报列表打印到控制台。
trigger : Optional(<UNCalendarNotificationTrigger: 0x283242f20; dateComponents: <NSDateComponents: 0x2830567a0> {
Hour: 6
Minute: 40
Weekday: 2, repeats: YES>)
trigger : Optional(<UNCalendarNotificationTrigger: 0x283241920; dateComponents: <NSDateComponents: 0x283056900> {
Hour: 6
Minute: 40
Weekday: 2, repeats: YES>)
trigger : Optional(<UNCalendarNotificationTrigger: 0x2832416a0; dateComponents: <NSDateComponents: 0x2830556f0> {
Hour: 6
Minute: 40
Weekday: 3, repeats: YES>)
trigger : Optional(<UNCalendarNotificationTrigger: 0x283242f20; dateComponents: <NSDateComponents: 0x283056900> {
Hour: 6
Minute: 40
Weekday: 2, repeats: YES>)
trigger : Optional(<UNCalendarNotificationTrigger: 0x2832426e0; dateComponents: <NSDateComponents: 0x283054c40> {
Hour: 6
Minute: 40
Weekday: 3, repeats: YES>)
trigger : Optional(<UNCalendarNotificationTrigger: 0x2832413c0; dateComponents: <NSDateComponents: 0x283056930> {
Hour: 6
Minute: 40
Weekday: 4, repeats: YES>)
我想要的是三个触发器，并将工作日一个一地存储在[2,3,4]数组中。
但是，创建了六个触发器，并且工作日的顺序存储不正确。
我想问两个问题。
如果您查看上面代码的日志，如果您有一系列的触发器，其中“工作日”存储为2，是否逐个执行？例如，今天是星期一，下周一是一次？
为什么警报存储如此错误，如何解决该问题？
之所以得到六个触发器，是因为在for循环（for weekday in weekdays）中，每个触发器都添加了两次。每个触发器在该行添加一次center.add(request)，然后在该行添加一次UNUserNotificationCenter.current().add(request) { (error) in。您可以通过更新for循环来解决此问题，如下所示：
for weekday in weekdays {
var dateComponents = DateComponents()
dateComponents.hour = hour
dateComponents.minute = minute
dateComponents.weekday = weekday
let trigger = UNCalendarNotificationTrigger.init(dateMatching: dateComponents, repeats: true)
let request = UNNotificationRequest(identifier: UUID().uuidString, content: content, trigger: trigger)
center.current().add(request) { (error) in
if error != nil {
print(error.localizedDescription)
}
}
}
您也可能只想在for循环完成之后打印出触发器，而不是在for循环内打印出来。因此，我将在for循环之后添加以下代码：
func scheduleNotification() {
...
for weekday in weekdays {
...
}
//This following code was originally within your for loop, but should probably execute after the for loop instead
//The console should look a lot cleaner after doing so
center.getPendingNotificationRequests { (requests) in
for request in requests {
print("trigger : \(request.trigger)")
}
}
}
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