Objective c 特定范围内的日期，包括Sensor DeredSceneding和Sensor DeredSceneding

我有以下代码：

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

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

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但是当firstDate=dateSelected或secondDate=dateSelected时，它不会在“if”中输入…为什么？？？

您确定当firstDate=dateSelected时，所选日期早于secondDate吗？当前您的逻辑是：只有当firstDateNSComparisonResult compareStart = [firstDate compare: dateSelected]; NSComparisonResult compareEnd = [secondDate compare: dateSelected]; if ( (compareStart == NSOrderedAscending || compareStart == NSOrderedSame) && (compareEnd == NSOrderedDescending || compareEnd == NSOrderedSame)) { // some code }