Accessing the Event Store

Your app must obtain permission from the user before accessing the calendar database: an app must never directly modify the calendar database on its own. ISN_EKSaveResult is the application’s point of contact for accessing calendar and reminder data.

using SA.iOS.EventKit;

To receive event data in iOS, you must request access to an entity type by using ISN_EKSaveResult

EKEventStore.Instance.RequestAccessToEvent((request) =>
{
    if(request.IsSucceeded)
    {
        Debug.Log("We Initialized EventKit with event!");
    }
    else
    {
        Debug.Log("We have error at initialized EventKit with event- " + request.Error.FullMessage);
    }
});

for Events and

EKEventStore.Instance.RequestAccessToReminder((request) =>
{
    if(request.IsSucceeded)
    {
        Debug.Log("We Initialized EventKit with reminder!");
    }
    else
    {
        Debug.Log("We have error at initialized EventKit with reminder - " + request.Error.FullMessage);
    }
});

for Reminders.

This will show dialog window for user where he can give or denied access to ISN_EKSaveResult functionality for Events and Reminders. Text thay user will see you can set here:

After all this you can use ISN_EKSaveResult functionality.