iOS - 如何比较两次? [英] iOS - how to compare two times?

问题描述

我使用以下函数来检查消息是否已过期 -

I use the following function to check if a message has expired -

- (BOOL) hasExpired:(NSDate*)myDate
{     
    if(myDate == nil)
    {
        return false;
    }
    NSDate *now = [NSDate date];
    return !([now compare:myDate] == NSOrderedAscending);
}

如果我比较两个不同的日期，这很好用.但是，如果消息在今天早些时候过期，则返回 false.关于如何修复它的任何想法?

This works fine if I am comparing two different dates. However, it returns false if the message has expired earlier in the day today. Any ideas on how I might fix it?

推荐答案

(添加我的评论作为答案:)

这不应该发生，NSDate 实例之间的 1 秒差异也足够了.添加带有两个日期的 NSLog() 以查看它们是否确实不同.

This should not happen, also 1 second difference between NSDate instances is enough. Add an NSLog() with both dates there to see whether they are different indeed.

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