ios - 如何检测哪个 EKevent 被更改

Question

我有问题。我需要知道我的 EventStore 中的事件何时发生更改，因此对于这种情况，我使用EKEventStoreChangedNotification但此通知返回给我难以理解userInfo 的字典，它看起来像这样：

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

我不知道如何使用这些数据来访问更改的对象。请帮我

Answer 1

这将检测更改的事件并记录某个日期范围内的事件标题。虽然，我最终没有这样做，因为实际上我不知道日期范围。我需要与我正在处理的所有事件进行比较，这意味着无论如何我都需要刷新它们，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，现在我只是在更改出现时每隔几秒钟刷新一次并忽略细节。我希望 Apple 改进这些通知。

#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;
            }
        }];
    }];
}