objective-c - 使用开始日期获取 iPhone 日历中的所有事件

Question

我有一个应用程序可以通过按钮提醒患者他/她的预约。如果患者单击按钮，我想获取患者日历中的所有事件以检查约会是否已经存在。如果不存在，我将创建事件。

我知道如何将事件添加到日历中，但获取的结果是返回零计数？？

下面是我的代码:

 //set start and end date
NSDate* startDate = [NSDate date];//start from today
NSDate* endDate =  [NSDate dateWithTimeIntervalSinceNow:[[NSDate distantFuture] timeIntervalSinceReferenceDate]];//no end
NSLog(@"S Date %@", startDate);
NSLog(@"E Date %@", endDate);

NSString *AppointmentTitle=@"Appointment in Hospital at Pediatric Clinic";

EKEventStore *store = [[EKEventStore alloc] init];
NSArray *calendarArray = [store calendars];
NSPredicate *fetchCalendarEvents = [store predicateForEventsWithStartDate:startDate endDate:endDate calendars:calendarArray];
NSArray *eventList = [store eventsMatchingPredicate:fetchCalendarEvents];
BOOL IsFound;
int EventsCount=eventList.count;
for(int i=0; i < EventsCount; i++)
{
    NSLog(@"Event Title:%@", [[eventList objectAtIndex:i] title]);
    if ([[[eventList objectAtIndex:i] title] isEqualToString:AppointmentTitle])//check title
    {
        IsFound=TRUE;
        break;
    }
    else
    {
        IsFound=FALSE;
    }
}

此代码在 2 个月前运行良好。突然，当我回来测试它时，它没有用。我错过了什么？或者我的代码有什么错误吗？

我需要你的帮助......

Answer 1

最终我得到了答案，我认为 Apple 做了一些允许的事情(在 iOS 5 中，您只能访问事件存储中的事件 (EKEntityTypeEvent)，而在 iOS 6 中您可以访问提醒 (EKEntityTypeReminder)。但是您需要以下代码才能至少获得 1 次授权。) “由 WrightsCS 回答”

找到下面的代码:-

   EKEventStore *store = [[EKEventStore alloc] init];


// Get the appropriate calendar
NSCalendar *calendar = [NSCalendar currentCalendar];


if ([store respondsToSelector:@selector(requestAccessToEntityType:completion:)])
{
    /* iOS Settings > Privacy > Calendars > MY APP > ENABLE | DISABLE */
    [store requestAccessToEntityType:EKEntityTypeEvent completion:^(BOOL granted, NSError *error)
     {
         if ( granted )
         {
             NSLog(@"User has granted permission!");
             // Create the start date components
             NSDateComponents *oneDayAgoComponents = [[NSDateComponents alloc] init];
             oneDayAgoComponents.day = -1;
             NSDate *oneDayAgo = [calendar dateByAddingComponents:oneDayAgoComponents
                                                           toDate:[NSDate date]
                                                          options:0];

             // Create the end date components
             NSDateComponents *oneYearFromNowComponents = [[NSDateComponents alloc] init];
             oneYearFromNowComponents.year = 1;
             NSDate *oneYearFromNow = [calendar dateByAddingComponents:oneYearFromNowComponents
                                                                toDate:[NSDate date]
                                                               options:0];

             // Create the predicate from the event store's instance method
             NSPredicate *predicate = [store predicateForEventsWithStartDate:oneDayAgo
                                                                     endDate:oneYearFromNow
                                                                   calendars:nil];

             // Fetch all events that match the predicate
             NSArray *events = [store eventsMatchingPredicate:predicate];
             NSLog(@"The content of array is%@",events);
         }
         else
         {
             NSLog(@"User has not granted permission!");
         }
     }];
}