iphone - 错误 : can't allocate region in iOS

Question

只要通过调用此方法选择一行 UIPickerView，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]];
    }
}

多次调用此方法后，我崩溃并显示此错误消息

malloc: *** mmap(size=627101696) failed (error code=12)
*** error: can't allocate region
*** set a breakpoint in malloc_error_break to debug

通过在 malloc_error_break 中设置断点，我的应用程序进入 for 循环(我在其中将对象添加到数组)。但我找不到问题所在，我在谷歌上搜索了同样的问题，但仍然没有运气。

任何人都可以帮助我解决我做错的问题吗？

Answer 1

你真的不应该根据一个月是 28 天甚至是 a minute is 60 seconds 的假设来计算日期。 .

代替 dateByAddingTimeInterval: 使用 NSCalendar 的 dateByAddingComponents:toDate:options:

NSDateComponents *sixMonthComponents = [[NSDateComponents alloc] init];
sixMonthComponents.month = 6;

NSCalendar *currentCalendar = [NSCalendar currentCalendar];
NSDate* scheduleEndDate = [currentCalendar dateByAddingComponents:sixMonthComponents toDate:scheduleStartDate options:0];

编辑:据我了解，您想每隔 14 天(半个月，因为您将一个月定义为 28 天)为数组添加一个时间间隔。为了更健壮，我会做这样的事情(未经测试但应该工作，让我知道):

// 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)];
}

旁注:[NSNumber numberWithDouble:i] can be written @(i) .