如何比较Objective-C中的两个日期

概述我有两个日期：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。 Cocoa has couple of methods for this： 在NSDate – isEqualToDate: – earlierDate: – laterDate: – compare: 当你使用 – (NSComparisonResult)compare：(NSDate *) 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。解决方法 Cocoa has couple of methods for this：

在NSDate

– isEqualToDate:  – earlIErDate:  – laterDate:  – compare:

当你使用 – (NSComparisonResult)compare：(NSDate *)anotherDate，你回到其中之一：

The receiver and anotherDate are exactly equal to each other,NSOrderedSameThe receiver is later in time than anotherDate,NSOrderedDescendingThe receiver is earlIEr in time than anotherDate,NSOrderedAscending.

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 %@",Now); break;    case NSOrderedSame: NSLog(@"%@ is the same as %@",Now); break;    default: NSLog(@"erorr dates %@,%@",Now); break;}[mile release];

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