如何在Objective-C中比较两个日期 [英] How to compare two dates in Objective-C

问题描述

我有两个日期:2009-05-11 和当前日期.我想检查给定的日期是否是当前日期.这怎么可能.

I have two dates: 2009-05-11 and the current date. I want to check whether the given date is the current date or not. How is this possible.

推荐答案

Cocoa 有几个方法用于此:

在 NSDate 中

– isEqualToDate:  
– earlierDate:  
– laterDate:  
– compare:

当你使用 - (NSComparisonResult)compare:(NSDate *)anotherDate 时，你会得到以下之一:

When you use - (NSComparisonResult)compare:(NSDate *)anotherDate ,you get back one of these:

The receiver and anotherDate are exactly equal to each other, NSOrderedSame
The receiver is later in time than anotherDate, NSOrderedDescending
The receiver is earlier in time than anotherDate, NSOrderedAscending.

示例:

NSDate * now = [NSDate date];
NSDate * mile = [[NSDate alloc] initWithString:@"2001-03-24 10:45:32 +0600"];
NSComparisonResult result = [now compare:mile];

NSLog(@"%@", now);
NSLog(@"%@", mile);

switch (result)
{
    case NSOrderedAscending: NSLog(@"%@ is in future from %@", mile, now); break;
    case NSOrderedDescending: NSLog(@"%@ is in past from %@", mile, now); break;
    case NSOrderedSame: NSLog(@"%@ is the same as %@", mile, now); break;
    default: NSLog(@"erorr dates %@, %@", mile, now); break;
}

[mile release];

这篇关于如何在Objective-C中比较两个日期的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！