使用 NSOrderedAscending 和 NSOrderedDescending 在特定范围内的日期 [英] date in a specific range with NSOrderedAscending and NSOrderedDescending

问题描述

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 时它不会在if"中输入...为什么??

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

推荐答案

你确定当 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.如果想要firstDate <= dateSelected <= secondDate，那么就需要实现如下代码:

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
}

更新:

要在不依赖时间的情况下比较两个 NSDate，请参阅:比较两个 NSDate并忽略时间分量

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

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