如何更快地删除日历事件？
如何更快地删除日历事件？
提问于 2010-10-28 15:15:46
下面的代码工作并从iPhone日历数据库中删除所有日历事件。但事件的删除速度非常慢:在iPhone 3GS上每秒2个事件。所以如果你有3000个事件-那么需要25分钟来删除它们...你将如何优化这段代码？也许我做错了什么？谢谢。
- (void)deleteAllCalendarEventsFromIPhone:(NSError **)error {
EKEventStore *store = [[EKEventStore alloc] init];
NSUInteger beginYear = 1900;
NSUInteger endYear = 2100;
while (beginYear < endYear) {
NSPredicate *predicate =
[store predicateForEventsWithStartDate:[self createDateWithYear:beginYear month:1 day:1]
endDate:[self createDateWithYear:beginYear + 4 month:1 day:1]
calendars:nil];
NSArray *eventList = [store eventsMatchingPredicate:predicate];
for (EKEvent *event in eventList) {
success = [store removeEvent:event span:EKSpanThisEvent error:nil];
}
beginYear += 4;
}
[store release];
}回答 3
Stack Overflow用户
发布于 2011-09-22 16:35:24
iOS 5.0有一个新的removeEvent:方法，它允许您直到最后才能提交更改。我还没有测试它，但听起来这正是您在这里需要的。
Stack Overflow用户
发布于 2010-10-28 15:34:39
也许是因为这不是EKEventStore的用法！
删除所有用户事件非常危险...
Stack Overflow用户
发布于 2011-05-11 00:39:45
-(void)deleteElementFromCalendarDB {
CFGregorianDate gregorianStartDate, gregorianEndDate;
CFGregorianUnits startUnits = {-2, 0, 0, 0, 0, 0};
CFGregorianUnits endUnits = {1, 0, 0, 0, 0, 0};
CFTimeZoneRef timeZone = CFTimeZoneCopySystem();
gregorianStartDate = CFAbsoluteTimeGetGregorianDate(
CFAbsoluteTimeAddGregorianUnits(CFAbsoluteTimeGetCurrent(),
timeZone,startUnits),timeZone);
gregorianStartDate.hour = 0;
gregorianStartDate.minute = 0;
gregorianStartDate.second = 0;
gregorianEndDate = CFAbsoluteTimeGetGregorianDate(
CFAbsoluteTimeAddGregorianUnits(CFAbsoluteTimeGetCurrent(),
timeZone, endUnits),timeZone);
gregorianEndDate.hour = 0;
gregorianEndDate.minute = 0;
gregorianEndDate.second = 0;
NSDate* startDate = [NSDate dateWithTimeIntervalSinceReferenceDate:
CFGregorianDateGetAbsoluteTime(gregorianStartDate, timeZone)];
NSDate* endDate = [NSDate dateWithTimeIntervalSinceReferenceDate:
CFGregorianDateGetAbsoluteTime(gregorianEndDate, timeZone)];
CFRelease(timeZone);
NSError *err;
NSPredicate *predicate = [self.eventStore predicateForEventsWithStartDate:startDate
endDate:endDate
calendars:nil];
NSArray *eventListS = [self.eventStore eventsMatchingPredicate:predicate];
for (EKEvent *event in eventListS) {
[self.eventStore removeEvent:event span:EKSpanFutureEvents error:&err];
}
if (err == noErr) {
UIAlertView *alert =[[UIAlertView alloc]itWithTitle:@"All Events were deleted" message:@"How about that?"
delegate:nil
cancelButtonTitle:@"Okay"
otherButtonTitles:nil];
[alert show];
[alert release];
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/4040621
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