Question

如果我想使用EKEvent方法从EKEventStore检索先前保存的事件eventWithIdentifier，但我总是为空。

这是添加事件的代码：

EKEventStore *eventStore = [[EKEventStore alloc] init];
EKEvent *newEvent = [EKEvent eventWithEventStore:eventStore];
newEvent.title = @"Test";
newEvent.availability = EKEventAvailabilityFree;
newEvent.startDate = startDate;
newEvent.endDate = endDate;
[newEvent addAlarm:[EKAlarm alarmWithRelativeOffset:-15*60]];

newEvent.calendar = [eventStore defaultCalendarForNewEvents];

NSError *err;
BOOL success = [eventStore saveEvent:newEvent span:EKSpanThisEvent commit:YES error:&err];

if (success) {
    if ([newEvent respondsToSelector:@selector(calendarItemIdentifier)]) {
        [[NSUserDefaults standardUserDefaults] setObject:newEvent.calendarItemIdentifier forKey:self.showId];
        NSLog(@"Event ID: %@",newEvent.calendarItemIdentifier);
    }
    else {
        [[NSUserDefaults standardUserDefaults] setObject:newEvent.UUID forKey:self.showId];
        NSLog(@"Event ID: %@",newEvent.UUID);
    }
}

删除事件的代码：

EKEventStore *eventStore = [[EKEventStore alloc] init];

NSError *err;
BOOL success = YES;

NSLog(@"Event ID: %@",[[NSUserDefaults standardUserDefaults] objectForKey:self.showId]);

EKEvent *existingEvent = [eventStore eventWithIdentifier:[[NSUserDefaults standardUserDefaults] objectForKey:self.showId]];
NSLog(@"Existing event: %@",existingEvent);
if (existingEvent != nil) {
    success = [eventStore removeEvent:existingEvent span:EKSpanThisEvent error:&err];
}
if (success) {
    [[NSUserDefaults standardUserDefaults] removeObjectForKey:self.showId];
}

为什么我无法从具有相同事件ID的日历中删除以前添加的事件？

此代码已在iOS 5（iPad 1）和iOS 6（新iPad）上测试...

Answer 1

我使用newEvent.eventIdentifier代替newEvent.calendarItemIdentifier，到目前为止，使用[store eventWithIdentifier:_project.event_identifier]，我可以检索，删除和编辑现有事件。你应该试试。

Answer 2

文档警告说“如果事件的日历发生变化，其标识符很可能也会发生变化。”在您存储eventIdentifer和尝试删除它之间的事件有什么变化吗？

在iOS上使用eventWithIdentifier的EKEvent

2 个答案: