我正在使用UNUserNotificationCenter在iOS上显示一些本地通知。这些是预定的通知。这是我的高级要求:(类似于iOS上的Reminders应用程序。您可以选择提醒时间,设置间隔(频繁)以及设置到期日期。
我有一个开始日期(2018年6月1日)和结束日期(2018年6月28日)和时间(例如,每天下午2:00)。这些本地通知应仅在指定日期之间触发。
这是我的代码:
var content = new UNMutableNotificationContent();
content.Title = "Title";
content.Subtitle = "Subtitle";
content.Body = "Body";
content.Badge = 1;
content.CategoryIdentifier = categoryID;
content.Sound = UNNotificationSound.Default;
var d = new NSDateComponents {
Hour = 14
};
//Repeat is true, so it will keep triggering when ever the hour reads 14
var newTrigger = UNCalendarNotificationTrigger.CreateTrigger(d, true);
var requestID = "notificationRequest";
var request = UNNotificationRequest.FromIdentifier(requestID, content, newTrigger);
//Here I set the Delegate to handle the user tapping on notification
UNUserNotificationCenter.Current.Delegate = new CustomUNUserNotificationCenterDelegate();
UNUserNotificationCenter.Current.AddNotificationRequest(request, (err) => {
if (err != null) {
// Report error
System.Console.WriteLine("Error: {0}", err);
} else {
// Report Success
System.Console.WriteLine("Notification Scheduled: {0}", request);
}
});
我正在检查WillPresentNotification方法中的条件:
public override void WillPresentNotification(UNUserNotificationCenter center, UNNotification notification, Action<UNNotificationPresentationOptions> completionHandler) {
DateTime StartDate = new DateTime(2018, 6, 1, 0, 0, 0);
DateTime EndDate = new DateTime(2018, 6, 28, 0, 0, 0);
if ((DateTime.Now > StartDate) && (DateTime.Now < EndDate)) {
UIAlertView alertView = new UIAlertView();
alertView.Message = "within the date range";
alertView.AddButton("OK");
alertView.Show();
completionHandler(UNNotificationPresentationOptions.Alert | UNNotificationPresentationOptions.Sound | UNNotificationPresentationOptions.Badge);
} else {
var requests = new string[] { "notificationRequest" };
UNUserNotificationCenter.Current.RemovePendingNotificationRequests(requests);
}
}
如果应用程序位于前台并且通知自动取消,则此方法可以正常工作。但如果该应用程序被杀,那么这些通知仍然会继续。有没有办法检查何时在后台触发本地通知,以便可以检查上述逻辑并停止这些通知?
还有其他方法可以在6月28日下午2点准确地停止吗?
另外,我对iOS不太熟悉,UICalenderNotification触发器是否有到期日期?
我尝试使用ComponentsFromDateToDate进行实验,但通知仍在进行..
//This is just test data
var d = new NSDateComponents();
NSCalendar currCal = new NSCalendar(NSCalendarType.Gregorian);
var d1 = new NSDateComponents();
d1.Day = 29;
d1.Month = 5;
d1.Year = 2018;
d1.Hour = 12;
d1.Minute = 58;
d1.Second = 00;
var d2 = new NSDateComponents();
d2.Day = 29;
d2.Month = 5;
d2.Year = 2018;
d2.Hour = 13;
d2.Minute = 02;
d2.Second = 00;
currCal.ComponentsFromDateToDate(NSCalendarUnit.Second, d1, d2, NSCalendarOptions.None);
d.Second = 10;
d.Calendar = currCal;
我在这里做错了什么,或者应该考虑采取不同的做法?
我还在考虑使用后台提取,并且有一段代码可以检查日期范围的上述逻辑。
感谢任何帮助。谢谢!
答案 0 :(得分:0)
我认为最佳解决方案是:使用UNNotificationRequest
中的UNUserNotificationCenter
将UNCalendarNotificationTrigger
添加到6.1-6.28
,在6.28之后永远不会触发通知,因此这样做您无需手动删除该请求。
for(int i = 1; i < 29; i++)
{
NSDateComponents d = new NSDateComponents() { Year = 2018, Month = 6,Day = i,Hour= 14 };
UNCalendarNotificationTrigger trigger = UNCalendarNotificationTrigger.CreateTrigger(d, true);
UNMutableNotificationContent content = new UNMutableNotificationContent() { Title = "xxx", Body = "xxx", CategoryIdentifier = "xxx" };
UNNotificationRequest request = UNNotificationRequest.FromIdentifier(i.ToString(), content, trigger);
UNUserNotificationCenter.Current.AddNotificationRequest(request,null);
}