Objective-C排序字符串日期数组 [英] Objective-C Sort String Date Array

问题描述

我有一个数组，由日期组成，但 NSString 。如何排序？

I have an array which consists of dates but as NSString. How do I sort it descending?

编辑：我通过调整我的代码使用NSDate使用其他方法不会在我的情况下工作

EDIT : I Ended up by tweaking my code to use NSDate as using other methods won't work in my case

推荐答案

您可以使用 sortedArrayUsingFunction ，考虑下面的例子

You could use sortedArrayUsingFunction, consider the bellow example

NSString *str1 = @"03-07-2012";
NSString *str2 = @"01-07-2012";
NSString *str3 = @"02-07-2012";


NSArray *arr = [NSArray arrayWithObjects:str1, str2, str3, nil];
arr = [arr sortedArrayUsingFunction:dateSort context:nil];


//The date sort function
NSComparisonResult dateSort(NSString *s1, NSString *s2, void *context) {

    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setDateFormat:@"dd-MM-yyyy"];

    NSDate *d1 = [formatter dateFromString:s1];
    NSDate *d2 = [formatter dateFromString:s2];

    return [d1 compare:d2]; // ascending order
    return [d2 compare:d1]; // descending order
}

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