如何创建一个 NSDate 日期对象? [英] How to create an NSDate date object?

问题描述

如何从日、月和年创建 NSDate?似乎没有任何方法可以做到这一点，他们已经删除了类方法 dateWithString(他们为什么要这样做?！).

How can I create an NSDate from the day, month and year? There don't seem to be any methods to do this and they have removed the class method dateWithString (why would they do that?!).

推荐答案

您可以为此编写一个类别.我这样做了，这就是代码的样子:

You could write a category for this. I did that, this is how the code looks:

//  NSDateCategory.h

#import <Foundation/Foundation.h>

@interface NSDate (MBDateCat) 

+ (NSDate *)dateWithYear:(NSInteger)year month:(NSInteger)month day:(NSInteger)day;

@end



//  NSDateCategory.m

#import "NSDateCategory.h"

@implementation NSDate (MBDateCat)

+ (NSDate *)dateWithYear:(NSInteger)year month:(NSInteger)month day:(NSInteger)day {
    NSCalendar *calendar = [[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar] autorelease];
    NSDateComponents *components = [[[NSDateComponents alloc] init] autorelease];
    [components setYear:year];
    [components setMonth:month];
    [components setDay:day];
    return [calendar dateFromComponents:components];
}

@end

像这样使用它:NSDate *aDate = [NSDate dateWithYear:2010 month:5 day:12];

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