iphone - 如何检查限制的日期和时间是否与另一个限制重叠？

Question

我想检查日期限制*(例如:- 22/07/2013 2:30PM -22/07/2013 8:30PM )* 是否有另一个时间限制*< em>(例如:- 22/07/2013 4:30PM -22/07/2013 6:30PM )* 或不是。我对这个概念完全陌生。谁能告诉我该怎么做。

任何帮助将不胜感激

下面是我试过的代码:

- (void)viewDidLoad
{
    [self isDateInterval:@"8/1/2013 8:30am" and:@"8/1/2013 8:40am" fallsWithin:@"8/1/2013 8:30am" and:@"8/1/2013 8:55am"];
    [super viewDidLoad];
}

-(BOOL)isDateInterval:(NSString*)startDate1 and:(NSString*)endDate1 fallsWithin:(NSString*)startDate2 and:(NSString*)endDate2
{
    BOOL isWithinrange;

    NSDateFormatter *formatter = [[NSDateFormatter alloc]init];

    [formatter setDateFormat:@"dd/MM/yyyy hh:mmaa"];

    NSTimeInterval ti1 = [[formatter dateFromString:startDate1] timeIntervalSince1970];
    NSTimeInterval ti2 = [[formatter dateFromString:endDate1] timeIntervalSince1970];

    NSTimeInterval ti3 = [[formatter dateFromString:startDate2] timeIntervalSince1970];
    NSTimeInterval ti4 = [[formatter dateFromString:endDate2] timeIntervalSince1970];

    if( (ti3 > ti1 && ti3 < ti2) || (ti3 < ti1 && ti4 > ti1) )
    {
        //Date with in range
        isWithinrange=TRUE;
    }
    else
    {
        isWithinrange=FALSE;
        //Not with in range
    }

    return isWithinrange;
}

我希望输出为“isWithin”，因为一个时间间隔的一部分正在进入另一个时间间隔

Answer 1

这段代码会给你你想要的。它检查两个间隔的开始日期或结束日期是否在另一个间隔的开始日期和结束日期之间。

- (BOOL)timeIntervalFromDate:(NSString *)dateString toDate:(NSString *)anotherDateString overlapsWithTimeIntervalFromDate:(NSString *)date2String toDate:(NSString *)anotherDate2String {
    BOOL isWithinRange = NO;

    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    formatter.dateFormat = @"dd/MM/yyyy hh:mmaa";

    NSDate *date = [formatter dateFromString:dateString];
    NSDate *anotherDate = [formatter dateFromString:anotherDateString];
    NSDate *date2 = [formatter dateFromString:date2String];
    NSDate *anotherDate2 = [formatter dateFromString:anotherDate2String];

    NSDate *startDate = [date earlierDate:anotherDate];
    NSDate *endDate = [date laterDate:anotherDate];

    NSDate *otherStartDate = [date2 earlierDate:anotherDate2];
    NSDate *otherEndDate = [date2 laterDate:anotherDate2];

    BOOL startDateIsEarlierThanOtherStartDate = [startDate earlierDate:otherStartDate] == startDate;
    BOOL endDateIsLaterThanOtherStartDate = [endDate laterDate:otherStartDate] == endDate;

    BOOL startDateIsEarlierThanOtherEndDate = [startDate earlierDate:otherEndDate] == startDate;
    BOOL endDateIsLaterThanOtherEndDate = [endDate laterDate:otherEndDate] == endDate;

    BOOL otherStartDateIsEarlierThanStartDate = [startDate earlierDate:otherStartDate] == otherStartDate;
    BOOL otherEndDateIsLaterThanStartDate = [otherEndDate laterDate:startDate] == otherEndDate;

    BOOL otherEndDateIsEarlierThanStartDate = [startDate earlierDate:otherEndDate] == otherEndDate;
    BOOL otherEndDateIsLaterThanEndDate = [endDate laterDate:otherEndDate] == otherEndDate;

    isWithinRange = (startDateIsEarlierThanOtherStartDate && endDateIsLaterThanOtherStartDate) || (startDateIsEarlierThanOtherEndDate && endDateIsLaterThanOtherEndDate) || (otherStartDateIsEarlierThanStartDate && otherEndDateIsLaterThanStartDate) || (otherEndDateIsEarlierThanStartDate && otherEndDateIsLaterThanEndDate);

    return isWithinRange;
}

为了说明每种可能的情况，任何一对 bool 语句都必须为真。向方法提供日期对的顺序无关紧要。