ios - 保存 80 个事件后收到内存警告

Question

- (void)syncWithCalendar
{

    NSMutableDictionary *dictionary = [util readPListData];  
    NSMutableArray *courses = [util getCourses];  
    __block NSMutableArray *lessons;   
    __block NSMutableDictionary *lesson;    
    NSString *studentID = [util getProgramDetails].studentId;  
    NSString *programName = [util getProgramDetails].programName;

    __block NSString *startDateString = @"", *endDateString = @"";

    NSDateFormatter *formatter;  
    formatter = [[NSDateFormatter alloc] init];  
    [formatter setDateFormat:@"MM/dd/yyyy HH:mm:ss"];  
    [formatter setDateFormat:@"MM/dd/yyyy"];  

    NSString *currentDateString = [NSString stringWithFormat:@"%@ 09:00:00", [formatter stringFromDate:[NSDate date]]];  
    [formatter setDateFormat:@"MM/dd/yyyy HH:mm:ss"];

    NSDate *currentDate = [formatter dateFromString:currentDateString];

    self.eventstore = [[EKEventStore alloc] init];

   [self.eventstore requestAccessToEntityType:EKEntityTypeEvent completion:^(BOOL granted, NSError *error)  
    {  
        if (granted) {  

            NSLog(@"calendar access granted");

            for (int i=0; i<[courses count]; i++)
            {
                lessons = [[courses objectAtIndex:i] objectForKey:@"lessons"];
                for (int j=0; j<[lessons count]; j++)
                {
                    lesson = [lessons objectAtIndex:j];
                    NSString *title = nil;
                    title = [NSString stringWithFormat:@"%@ %@-Complete %@ lesson",studentID,programName,[lesson objectForKey:@"lesson-name"]];

                    startDateString = [NSString stringWithFormat:@"%@ %@", [lesson objectForKey:@"exam-date"], @"09:00:00"];
                        endDateString = [NSString stringWithFormat:@"%@ %@", [lesson objectForKey:@"exam-date"], @"18:00:00"];

                    if (!([startDateString isEqualToString:@""] && [endDateString isEqualToString:@""]))
                    {
                        EKEvent *event = [EKEvent eventWithEventStore:self.eventstore];
                        event.title=title;
                        event.startDate = [formatter dateFromString:startDateString];
                        event.endDate = [formatter dateFromString:endDateString];

                        event.allDay = NO;

                        [event setCalendar:[self.eventstore defaultCalendarForNewEvents]];


                       NSError *err = nil;
             [self.eventstore saveEvent:event span:EKSpanThisEvent commit:YES error:&err];
           //[self.eventstore saveEvent:event span:EKSpanThisEvent error:&err];
                            if (err) {
                                NSLog(@"event not saved .. error = %@",err);
                            } else {
                                NSLog(@"event added successfully");
                            }       
                    }
                } // lessons for loop
            } // courses for loop

        } else {
            NSLog(@"Access not granted");
        }
    }];

    [self.eventstore release];  
    [formatter release];
}

成功添加事件后显示:

"Received Memory Warning. Terminating in response to SpringBoard's termination"

然后应用终止。这发生在 iOS 7 设备中。我还没有在 iOS 6 及以下版本中检查过它。如果只保存了几个事件(30 个或更少)，代码工作正常，但在保存 80 个或更多事件时显示内存问题。

Answer 1

我终于找到了问题的答案。我想分享我的解决方案，以便它可以帮助其他人....

我在 iOS 7 中特别遇到崩溃，这是因为下面这行

//错误
[self.eventstore saveEvent:event span:EKSpanThisEvent commit:YES error:&err];

保存事件的正确方法:(注意:我的案例不需要事件标识符)
//正确
[self.eventstore saveEvent:event span:EKSpanThisEvent commit:NO er​​ror:&err]; 然后使用 [self.eventstore 提交:NULL]

保存所有事件后。 这阻止了我的崩溃。