xcode4.5中的NSDate比较

Question

我有以下代码

NSDate * selectedDate = self.datePicker.date;

NSLog(@"The date selected is %@ and initialdate is %@", selectedDate, initialDate);

NSLog(@"the expression value is %i", [self.initialDate isEqualToDate:selectedDate]);

，它将打印以下内容

The date selected is 2012-09-24 18:49:04 +0000 and initialdate is 2012-09-24 18:49:04 +0000

the expression value is 0

我使用的是xcode4.5，目标是ios6。xcode4.4中的相同代码打印1(它们是相等的)

Answer 1

这样啊，原来是这么回事。

当我添加下面这行代码时

NSLog(@"Initaldate with time intervel since 1970 %f  and selecteddate %f", [initialDate timeIntervalSince1970], [selectedDate timeIntervalSince1970]);

它在iOS 5中打印相同的值，但在iOS6中打印不同的值。