（EventKit）为什么从日历中检索事件大约需要10秒钟？

Question

所以我从iOS日历中检索事件（在某个谓词中），将它们排序并存储在一个数组中;然后我获取第一个事件的标题，时间和位置，并在故事板上将它们显示为UILabels。 我遇到的第一个问题是，当我构建并运行应用程序时，不会显示任何内容。我必须退出应用程序（从多任务处理）并从模拟器运行它，并在每次延迟10秒后显示（我的第二个问题）。 我正在我的视图控制器的（void）viewDidLoad函数中运行以上所有代码，我认为问题来自于此。有没有办法在应用程序启动之前或启动时运行代码，这样用户就不必等待他的事件加载？ 谢谢！ 这是我的代码：

//Load Calendar Events
EKEventStore *store = [[EKEventStore alloc] init];

[store requestAccessToEntityType:EKEntityTypeEvent completion:^(BOOL granted,
                                                                NSError *error) {
    if (granted) {
    NSLog(@"User has granted permission");
    // Get the appropriate calendar
    NSCalendar *calendar = [NSCalendar currentCalendar];

    //Create the start date component
    NSDateComponents *nowComponents = [[NSDateComponents alloc] init];
    nowComponents.hour = 0;
    NSDate *now = [calendar dateByAddingComponents:nowComponents
                                                      toDate:[NSDate date]
                                                     options:0];

    // Create the end date components
    NSDateComponents *oneDayFromNowComponents = [[NSDateComponents alloc] init];
    oneDayFromNowComponents.day = 1;
    NSDate *todayEnd = [calendar dateByAddingComponents:oneDayFromNowComponents
                                                       toDate:[NSDate date]
                                                      options:0];

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

    // Fetch all events that match the predicate
    NSArray *events = [store eventsMatchingPredicate:predicate];
    NSLog(@"The events in the array are %@", events);

    NSArray *sortedArray = [events sortedArrayUsingComparator:^NSComparisonResult(EKEvent *event1, EKEvent *event2) {
            return [event1.startDate compare:event2.startDate];
        }];

    //Sort events according to date and fetch the one at index 0
        if ([sortedArray count] == 0){
            NSString *noEvent = (@"No Upcoming Events");
            NSString *noDescription = (@"No scheduled events for the day.");
            NSString *noLocale = (@"");

            self.eventTime.text = noEvent;
            self.eventTitle.text = noDescription;
            self.eventLocation.text = noLocale;
        } else {
            EKEvent *event = [sortedArray objectAtIndex:0];
            self.eventTitle.text = event.title;
            self.eventLocation.text = event.location;

            NSDateFormatter *formatter =  [[NSDateFormatter alloc] init];
            formatter.dateFormat = @"hh:mma";
            self.eventTime.text = [NSString stringWithFormat:@"%@ - %@", [formatter stringFromDate:event.startDate], [formatter stringFromDate:event.endDate]];
        }

    } else {
        NSLog(@"User has not granted permission");
    }
}];