使用 NSOrderedAscending 和 NSOrderedDescending 指定特定范围内的日期

发布于 2024-11-14 04:30:19 字数 404 浏览 3 评论 0原文

我有这个代码：

NSComparisonResult compareStart = [firstDate compare: dateSelected]; 
NSComparisonResult compareEnd = [secondDate compare: dateSelected];

if (((compareStart == NSOrderedAscending) || (compareStart == NSOrderedSame))
                   && (compareEnd == NSOrderedDescending))

但是当firstDate = dateSelected或secondDate = dateSelected时它不会进入“if”...为什么？

原文

I have this code:

NSComparisonResult compareStart = [firstDate compare: dateSelected]; 
NSComparisonResult compareEnd = [secondDate compare: dateSelected];

if (((compareStart == NSOrderedAscending) || (compareStart == NSOrderedSame))
                   && (compareEnd == NSOrderedDescending))

but it don't entry in the "if" when firstDate = dateSelected or secondDate = dateSelected...why??

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

Saygoodbye 2024-11-21 04:30:19

您确定当firstDate等于dateSelected时选择的日期早于secondDate吗？目前您的逻辑是：firstDate <= dateSelected <第二个日期。如果你想要firstDate <= dateSelected <= secondaryDate，那么你需要实现代码如下：

NSComparisonResult compareStart = [firstDate compare: dateSelected]; 
NSComparisonResult compareEnd = [secondDate compare: dateSelected];

if ( (compareStart == NSOrderedAscending || compareStart == NSOrderedSame)
                   && (compareEnd == NSOrderedDescending || compareEnd == NSOrderedSame)) {
  // some code
}

更新：

要比较两个NSDate而不依赖于时间，请参阅：比较两个 NSDate 并忽略时间部分

Are you sure that when firstDate equals dateSelected that date selected is earlier than secondDate? Currently your logic is: firstDate <= dateSelected < secondDate. If you want firstDate <= dateSelected <= secondDate, then you need to implement the code as follows:

NSComparisonResult compareStart = [firstDate compare: dateSelected]; 
NSComparisonResult compareEnd = [secondDate compare: dateSelected];

if ( (compareStart == NSOrderedAscending || compareStart == NSOrderedSame)
                   && (compareEnd == NSOrderedDescending || compareEnd == NSOrderedSame)) {
  // some code
}

Update:

To compare two NSDates without relying on time see: Comparing two NSDates and ignoring the time component

回复收藏 0 原文

~没有更多了~