我想知道如何在 iOS 中使用 EventKit 从 EventStore 获取所有事件。
这样我就可以指定今天的所有事件:
- (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;
}
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
distantFuture
作为开始日期和结束日期,不好。
所以其他 Q 中的其他 A 并不完全是我想要的。
谢谢你!
EDIT
我已经测试并得出结论,我只能获取最多 4 年时间内的事件。有办法克服这个吗?不使用多次获取..
将所有事件提取到数组中的代码:
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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