每当通过调用此方法选择UIPickerView
行时,我就会将对象添加到可变数组中 -
-(void)setScheduleStartDate:(NSString *)dateStr
{
[scheduleDatesArray removeAllObjects];
NSDateFormatter* df = [[NSDateFormatter alloc] init];
df.dateFormat = @"d MMMM yyyy";
scheduleStartDate = [df dateFromString:dateStr];
/******* getting array of schedule dates ***********/
NSDate* scheduleEndDate = [scheduleStartDate dateByAddingTimeInterval:60*60*24*28*6]; // add six month (of 28 days) in schedule start date
double endMS = [scheduleEndDate timeIntervalSinceDate:scheduleStartDate];
for (double i =0; i < endMS; i = (i + 60*60*24*14)) {
[scheduleDatesArray addObject:[NSNumber numberWithDouble:i]];
}
}
在多次调用此方法后,我遇到此错误消息
malloc: *** mmap(size=627101696) failed (error code=12)
*** error: can't allocate region
*** set a breakpoint in malloc_error_break to debug
通过设置malloc_error_break
中的断点,我的应用程序中断for循环(我将对象添加到数组中)。但我无法找到问题,我搜索了谷歌同样的问题,但仍然没有运气。
任何人都能帮我解决我做错的事吗?
答案 0 :(得分:2)
你真的不应该根据假设一个月是28天甚至是a minute is 60 seconds进行日期计算。
而不是dateByAddingTimeInterval:
使用NSCalendar
的{{1}}
dateByAddingComponents:toDate:options:
编辑:根据我的理解,您希望每隔~14天为您的阵列添加一个时间间隔(将您定义为一个月为28天的半个月)。为了更加健壮,我会做这样的事情(没有经过测试但应该有效,请告诉我):
NSDateComponents *sixMonthComponents = [[NSDateComponents alloc] init];
sixMonthComponents.month = 6;
NSCalendar *currentCalendar = [NSCalendar currentCalendar];
NSDate* scheduleEndDate = [currentCalendar dateByAddingComponents:sixMonthComponents toDate:scheduleStartDate options:0];
旁注:// We increment i with the total interval between the two dates (endMS) divided by 12 (6 months * 2 times per month)
for (double i = 0; i < endMS; i += (endMS / 12) {
[scheduleDatesArray addObject:@(i)];
}
can be written @(i)
。