/// <summary> /// Creates a new calendar or updates the name and color of an existing one. /// </summary> /// <param name="calendar">The calendar to create/update</param> /// <exception cref="System.ArgumentException">Calendar does not exist on device or is read-only</exception> /// <exception cref="System.UnauthorizedAccessException">Calendar access denied</exception> /// <exception cref="Calendars.Plugin.Abstractions.PlatformException">Unexpected platform-specific error</exception> public async Task AddOrUpdateCalendarAsync(Calendar calendar) { await RequestCalendarAccess().ConfigureAwait(false); EKCalendar deviceCalendar = null; if (!string.IsNullOrEmpty(calendar.ExternalID)) { deviceCalendar = _eventStore.GetCalendar(calendar.ExternalID); if (deviceCalendar == null) { throw new ArgumentException("Specified calendar does not exist on device", "calendar"); } } if (deviceCalendar == null) { deviceCalendar = CreateEKCalendar(calendar.Name, calendar.Color); calendar.ExternalID = deviceCalendar.CalendarIdentifier; // Update color in case iOS assigned one calendar.Color = ColorConversion.ToHexColor(deviceCalendar.CGColor); } else { deviceCalendar.Title = calendar.Name; if (!string.IsNullOrEmpty(calendar.Color)) { deviceCalendar.CGColor = ColorConversion.ToCGColor(calendar.Color); } NSError error = null; if (!_eventStore.SaveCalendar(deviceCalendar, true, out error)) { // Without this, the eventStore will continue to return the "updated" // calendar even though the save failed! // (this obviously also resets any other changes, but since we own the eventStore // we can be pretty confident that won't be an issue) // _eventStore.Reset(); if (error.Domain == _ekErrorDomain && error.Code == (int)EKErrorCode.CalendarIsImmutable) { throw new ArgumentException(error.LocalizedDescription, new NSErrorException(error)); } else { throw new PlatformException(error.LocalizedDescription, new NSErrorException(error)); } } } }