iOS7 日历 - 对日历守护程序的谓词调用失败：错误域 = EKCADErrorDomain 代码 = 1013

Question

我在尝试与现有项目集成的 iOS7 应用程序中首次运行我的应用程序时收到以下错误，但无法弄清楚如何消除此错误。

“对日历守护程序的谓词调用失败：错误域=EKCADErrorDomain Code=1013”

应用第一次运行时触发错误的代码是：

  NSMutableArray *events =  [NSMutableArray arrayWithArray:[self.eventStore eventsMatchingPredicate:predicate]];

在使用谓词语句之前是否需要检查 eventStore（在最后一个函数中）是否为空？

函数定义如下：

此功能确保用户已授予访问日历的权限。

// Prompt the user for access to their Calendar
    -(void)requestCalendarAccess
    {
        if([self.eventStore respondsToSelector:@selector(requestAccessToEntityType:completion:)])
        {
            [self.eventStore requestAccessToEntityType:EKEntityTypeEvent completion:^(BOOL granted, NSError *error)
             {
                 if (granted)
                 {
                     // The user has granted access to their Calendar; let's populate our UI with all events occuring in the next 24 hours.
                     [self accessGrantedForCalendar];
                 }
             }];
        }
    }

授权时调用下面的函数。

    // This method is called when the user has granted permission to Calendar
    -(void)accessGrantedForCalendar
    {
        // Let's get the default calendar associated with our event store
        self.defaultCalendar = PierceCalendar;
        // Enable the Add button
        self.addButton.enabled = YES;
        // Fetch all events happening in the next 24 hours and put them into eventsList
        self.eventsList = [self parseEventsByMonth];
    }

函数的第一行调用包含错误导致语句的 fetchEvents 函数。

-(NSMutableArray *) parseEventsByMonth
{
    NSMutableArray *allPierceEvents = [self fetchEvents];
     ....
    return parsedEventsByMonth;
}

此函数在应用程序首次运行时执行导致错误的语句 ([self.eventStore eventsMatchingPredicate:predicate])。

// Fetch all events happening in the next 24 hours
- (NSMutableArray *)fetchEvents
{
    NSMutableArray *pierceEvents = [[NSMutableArray alloc] init];

    //Create the end date components
    NSDateComponents *oneYearAgoComponents = [[NSDateComponents alloc] init];
    oneYearAgoComponents.year = -1;

    NSDate *startDate = [[NSCalendar currentCalendar] dateByAddingComponents:oneYearAgoComponents
                                                                      toDate:[NSDate date]
                                                                     options:0];

    NSDateComponents *oneYearFromNowComponents = [[NSDateComponents alloc] init];
    oneYearFromNowComponents.year = 1;
    NSDate *endDate = [[NSCalendar currentCalendar] dateByAddingComponents:oneYearFromNowComponents
                                                                    toDate:[NSDate date]
                                                                   options:0];

    // We will only search the default calendar for our events
    NSArray *calendarArray = [self.eventStore calendarsForEntityType:EKEntityTypeEvent];
    // Create the predicate
    NSPredicate *predicate = [self.eventStore predicateForEventsWithStartDate:startDate
                                                                      endDate:endDate
                                                                    calendars:calendarArray];

    // Fetch all events that match the predicate
    NSMutableArray *events =  [NSMutableArray arrayWithArray:[self.eventStore eventsMatchingPredicate:predicate]];

    for (EKEvent *event in events)
    {
        if (event.calendar == PierceCalendar) {
            [pierceEvents addObject:event];
        }
    }

    return pierceEvents;
}

Answer 1

我在导致错误的行之前插入了语句以消除错误。

[self.eventStore reset];

我发现提示来自：

calendarsForEntityType:EKEntityTypeReminder is empty first time, works subsequently