如何检测更改了哪个EKevent [英] How to detect which EKevent was changed

问题描述

我遇到了问题。我需要知道我的EventStore中的事件何时被更改，所以对于这种情况我使用 EKEventStoreChangedNotification 但是这个通知在 userInfo中返回给我难以理解的字典
它看起来像这样：

I got the problem. I need to know when Events in my EventStore are changed, so for this case I use EKEventStoreChangedNotification but this notification return to me incomprehensible dictionary in userInfo It's look like this:

EKEventStoreChangedObjectIDsUserInfoKey = ("x-apple-eventkit:///Event/p429" );

我不知道如何使用此数据来访问已更改的对象。请帮助我

I don't know how I can use this data to taking access for changed object. Please help me

推荐答案

这将检测更改的事件并在日期范围内记录事件标题。虽然，我最终没有这样做，因为在实践中我不知道日期范围。我需要与我正在使用的所有事件进行比较，这意味着我需要刷新它们，因为对象ID可能已经更改。这最终使每个事件都不那么有用，现在我只是在变化进来时每隔几秒刷新一次并忽略细节。我希望Apple改进这些通知。

This will detect changed events and log the event titles over a date range. Although, I ended up not doing this because in practice I don't know the date range. I need to compare with all the events I'm working with, which means I need to refresh them anyway since the object IDs might have changed. This ends up making each event not so useful and now I just refresh every few seconds when changes come in and ignore the details. I hope Apple improves these notifications.

#pragma mark - Calendar Changed
- (void)calendarChanged:(NSNotification *)notification {
    EKEventStore *ekEventStore = notification.object;

    NSDate *now = [NSDate date];
    NSDateComponents *offsetComponents = [NSDateComponents new];
    [offsetComponents setDay:0];
    [offsetComponents setMonth:4];
    [offsetComponents setYear:0];
    NSDate *endDate = [[NSCalendar currentCalendar] dateByAddingComponents:offsetComponents toDate:now options:0];

    NSArray *ekEventStoreChangedObjectIDArray = [notification.userInfo objectForKey:@"EKEventStoreChangedObjectIDsUserInfoKey"];
    NSPredicate *predicate = [ekEventStore    predicateForEventsWithStartDate:now
                                                                  endDate:endDate
                                                                calendars:nil];
    // Loop through all events in range
    [ekEventStore enumerateEventsMatchingPredicate:predicate usingBlock:^(EKEvent *ekEvent, BOOL *stop) {
        // Check this event against each ekObjectID in notification
        [ekEventStoreChangedObjectIDArray enumerateObjectsUsingBlock:^(NSString *ekEventStoreChangedObjectID, NSUInteger idx, BOOL *stop) {
            NSObject *ekObjectID = [(NSManagedObject *)ekEvent objectID];
            if ([ekEventStoreChangedObjectID isEqual:ekObjectID]) {
                // Log the event we found and stop (each event should only exist once in store)
                NSLog(@"calendarChanged(): Event Changed: title:%@", ekEvent.title);
                *stop = YES;
            }
        }];
    }];
}

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