Question

我有以下方法可以帮助我确定当月是否是从月底开始的3天或更短时间：

- (BOOL) checkMonthEnd {

    NSDate *now = [NSDate date];
    NSCalendar *cal = [NSCalendar currentCalendar];
    NSDate *startOfToday;
    [cal rangeOfUnit:NSCalendarUnitDay startDate:&startOfToday interval:NULL forDate:now];

    NSDate *startOfNextMonth = ({
        NSDate *startOfThisMonth;
        NSTimeInterval lengthOfThisMonth;
        [cal rangeOfUnit:NSCalendarUnitMonth startDate:&startOfThisMonth interval:&lengthOfThisMonth forDate:now];
        [startOfThisMonth dateByAddingTimeInterval:lengthOfThisMonth];
    });

    NSDateComponents *comp = [cal components:NSCalendarUnitDay fromDate:startOfToday toDate:startOfNextMonth options:0];
    if (comp.day < 4) {
        return YES;
    }  else {
        return NO;
    }
}

我想要做的是现在修改它，以便它显示当前日期是否在当前月份开始的前三天内。我怎么能这样做？

Answer 1

要确定它是否是该月的前三天之一，只需检索NSCalendarUnitDay并查看它是否小于4：

- (BOOL) checkMonthStart {
    NSDate *now = [NSDate date];
    NSCalendar *cal = [NSCalendar currentCalendar];
    NSDateComponents *components = [cal components:NSCalendarUnitDay fromDate:now];
    return components.day < 4;
}

顺便说一下，如果你在月底的三天内检查一下你是否会这样做，我可能会建议：

- (BOOL) checkMonthEnd {
    NSDate *now = [NSDate date];
    NSCalendar *cal = [NSCalendar currentCalendar];
    NSDateComponents *components = [cal components:NSCalendarUnitDay fromDate:now];

    NSRange range = [cal rangeOfUnit:NSCalendarUnitDay inUnit:NSCalendarUnitMonth forDate:now];

    return (range.length - components.day) < 3;
}

尝试确定当月的当前日期是否在iOS的月初

1 个答案: