从 EventStore EventKit iOS 中获取所有事件 [英] Fetch all events from EventStore EventKit iOS

问题描述

我想知道如何在 iOS 中使用 EventKit 从 EventStore 中获取所有事件.

这样我可以指定今天的所有活动:

- (NSArray *)fetchEventsForToday {NSDate *startDate = [NSDate 日期];//endDate 是 1 天 = 60*60*24 秒 = 距 startDate 86400 秒NSDate *endDate = [NSDate dateWithTimeIntervalSinceNow:86400];//创建谓词.将默认日历传递给它.NSArray *calendarArray = [NSArray arrayWithObject:defaultCalendar];NSPredicate *predicate = [self.eventStore predicateForEventsWithStartDate:startDate endDate:endDate calendars:calendarArray];//获取与谓词匹配的所有事件.NSArray *events = [self.eventStore eventsMatchingPredicate:predicate];返回事件；}

正确的应该使用 NSPredicate，它是通过以下方式创建的:

NSPredicate *predicate = [self.eventStore predicateForEventsWithStartDate:startDate endDate:endDate calendars:calendarArray];

我尝试过使用

distantPast遥远的未来

作为 startDate 和 endDate，不好.所以其他 Q 中的其他 A 并不是我要寻找的.

谢谢！

<小时>

编辑

我已经测试并得出结论，我最多只能获取 4 年的事件.有什么办法可以过去吗?不使用多次提取..

解决方案

获取所有事件到数组的代码:

NSDate *start = ...NSDate *完成 = ...//使用 Dictionary 删除由覆盖超过一年的事件产生的重复项NSMutableDictionary *eventsDict = [NSMutableDictionary dictionaryWithCapacity:1024];NSDate* currentStart = [NSDate dateWithTimeInterval:0 sinceDate:start];int seconds_in_year = 60*60*24*365;//以一年为单位枚举事件，因为 iOS 不支持超过 4 年的谓词！while ([currentStart compare:finish] == NSOrderedAscending) {NSDate* currentFinish = [NSDate dateWithTimeInterval:seconds_in_year sinceDate:currentStart];if ([currentFinish compare:finish] == NSOrderedDescending) {currentFinish = [NSDate dateWithTimeInterval:0 sinceDate:finish];}NSPredicate *predicate = [eventStore predicateForEventsWithStartDate:currentStart endDate:currentFinish calendars:nil];[eventStore 枚举EventsMatchingPredicate:谓词usingBlock:^(EKEvent *event, BOOL *stop) {如果(事件){[eventsDict setObject:event forKey:event.eventIdentifier];}}];currentStart = [NSDate dateWithTimeInterval:(seconds_in_year + 1) sinceDate:currentStart];}NSArray *events = [eventsDict allValues];

i would like to know how to fetch all events from an EventStore using EventKit in iOS.

This way i can specify all events for today:

- (NSArray *)fetchEventsForToday {

    NSDate *startDate = [NSDate date];

    // endDate is 1 day = 60*60*24 seconds = 86400 seconds from startDate
    NSDate *endDate = [NSDate dateWithTimeIntervalSinceNow:86400];

    // Create the predicate. Pass it the default calendar.
    NSArray *calendarArray = [NSArray arrayWithObject:defaultCalendar];
    NSPredicate *predicate = [self.eventStore predicateForEventsWithStartDate:startDate endDate:endDate calendars:calendarArray]; 

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

    return events;
}

The correct should use a NSPredicate, which is created with:

NSPredicate *predicate = [self.eventStore predicateForEventsWithStartDate:startDate endDate:endDate calendars:calendarArray]; 

I have tried using

distantPast
distantFuture

as startDate and endDate, no good. So other A's from other Q's are not exaclty wha im looking for.

Thank you!

---

EDIT

I have tested and got to the conclusion that i can only fetch events in a period of 4 years maximum. Any way of getting past this? Without using multiple fetches..

解决方案

Code for fetch all events into array :

NSDate *start = ...
NSDate *finish = ...

// use Dictionary for remove duplicates produced by events covered more one year segment
NSMutableDictionary *eventsDict = [NSMutableDictionary dictionaryWithCapacity:1024];

NSDate* currentStart = [NSDate dateWithTimeInterval:0 sinceDate:start];

int seconds_in_year = 60*60*24*365;

// enumerate events by one year segment because iOS do not support predicate longer than 4 year !
while ([currentStart compare:finish] == NSOrderedAscending) {

    NSDate* currentFinish = [NSDate dateWithTimeInterval:seconds_in_year sinceDate:currentStart];

    if ([currentFinish compare:finish] == NSOrderedDescending) {
        currentFinish = [NSDate dateWithTimeInterval:0 sinceDate:finish];
    }
    NSPredicate *predicate = [eventStore predicateForEventsWithStartDate:currentStart endDate:currentFinish calendars:nil];
    [eventStore enumerateEventsMatchingPredicate:predicate
                                      usingBlock:^(EKEvent *event, BOOL *stop) {

                                          if (event) {
                                              [eventsDict setObject:event forKey:event.eventIdentifier];
                                          }

                                      }];       
    currentStart = [NSDate dateWithTimeInterval:(seconds_in_year + 1) sinceDate:currentStart];

}

NSArray *events = [eventsDict allValues];

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