Iphone 在for循环中添加NSDateComponents

我正在尝试编写一个方法，该方法将运行for循环检查日期是否早于今天，如果早于今天，则需要通过NSDateComponent递增

检查日期是否早于今天的方法：

- (BOOL) isDatePassedToday:(NSDate *)recurringDate
{
    if ([recurringDate compare:[NSDate date]] == NSOrderedDescending)
        return NO;

    return YES;
}

-(NSDate *)calculateRecurringReminder:(NSDate *)startDate using:(NSDateComponents*)doItAgainComponents
{
    NSDate *recurringDate = [[NSDate alloc]init];

    recurringDate = [[NSCalendar currentCalendar] dateByAddingComponents:doItAgainComponents toDate:recurringDate options:0];

    // The loop to add components
    for ([self isDatePassedToday:recurringDate]; [self isDatePassedToday:recurringDate] == YES; doItAgainComponents)
    {

        recurringDate = [[NSCalendar currentCalendar] dateByAddingComponents:doItAgainComponents toDate:recurringDate options:0];

    }

    return recurringDate;
}

我需要for循环如何工作的逻辑：

- (BOOL) isDatePassedToday:(NSDate *)recurringDate
{
    if ([recurringDate compare:[NSDate date]] == NSOrderedDescending)
        return NO;

    return YES;
}

-(NSDate *)calculateRecurringReminder:(NSDate *)startDate using:(NSDateComponents*)doItAgainComponents
{
    NSDate *recurringDate = [[NSDate alloc]init];

    recurringDate = [[NSCalendar currentCalendar] dateByAddingComponents:doItAgainComponents toDate:recurringDate options:0];

    // The loop to add components
    for ([self isDatePassedToday:recurringDate]; [self isDatePassedToday:recurringDate] == YES; doItAgainComponents)
    {

        recurringDate = [[NSCalendar currentCalendar] dateByAddingComponents:doItAgainComponents toDate:recurringDate options:0];

    }

    return recurringDate;
}

也许你的意思是：

-(NSDate *)calculateRecurringReminder:(NSDate *)startDate using:(NSDateComponents*)doItAgainComponents {
    NSDate *recurringDate = startDate;

    while (![self isDatePassedToday:recurringDate]) {
        recurringDate = [[NSCalendar currentCalendar] dateByAddingComponents:doItAgainComponents toDate:recurringDate options:0];
    }

    return recurringDate;
}

---

那么你对我们的期望是什么？那么你对循环的期望行为是什么？它实际上做了什么？我只是希望循环不断地将doItAgainComponents添加到recurringDate中，直到它今天通过为止。嗯，虽然这似乎正是我所需要的，但它锁定了我的UI，即使是很小的计算，似乎也无法完成。有什么建议吗？也许这是一个无限循环。在调试器中运行此命令并查看原因。也许

recurringDate

没有按预期递增，或者

isDatePassedToday

永远不会返回

YES

。对不起，我想得不清楚，是的，你是对的，它正在进入一个无限循环。我想我知道这个问题，但是我原来的问题得到了回答，所以非常感谢。