对NSString的NSArray进行排序 [英] Sorting an NSArray of NSString

问题描述

有人可以告诉我排序NSMutableArray的代码吗？我有以下NSMutableArray：

Can someone please show me the code for sorting an NSMutableArray? I have the following NSMutableArray:

NSMutableArray *arr = [[NSMutableArray alloc] init];

包含2，4，5，1，1等元素9等等都是NSString。

with elements such as "2", "4", "5", "1", "9", etc which are all NSString.

我想按降序对列表进行排序，以便列表中最大值整数最高（索引0） 。

I'd like to sort the list in descending order so that the largest valued integer is highest in the list (index 0).

我尝试了以下内容：

[arr sortUsingSelector:@selector(compare:)];

但它似乎没有正确排序我的值。

but it did not seem to sort my values properly.

有人能告诉我代码是否正确地做了我想要完成的事情？谢谢！

Can someone show me code for properly doing what I am trying to accomplish? Thanks!

推荐答案

为字符串编写自己的比较方法非常简单：

It's pretty simple to write your own comparison method for strings:

@implementation NSString(compare)

-(NSComparisonResult)compareNumberStrings:(NSString *)str {
    NSNumber * me = [NSNumber numberWithInt:[self intValue]];
    NSNumber * you = [NSNumber numberWithInt:[str intValue]];

    return [you compare:me];
}

@end

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