我有一个NSArray NSString的，但一些字符串只是数字。如何正确排序数字？ [英] I have an NSArray on NSString's, but some of the strings are only numbers. How do I sort numerically properly?

问题描述

我的NSArray包含100,110,91,98和87，所有NSStrings。

My NSArray contains 100, 110, 91, 98, and 87, all NSStrings.

我想按照这个顺序排序：87 ，91，98，100，110。

I'd like to sort them to show up in this order: 87, 91, 98, 100, 110.

而是显示为100,110,87,91,98。

Instead they are showing up as 100, 110, 87, 91, 98.

我不能启动数组的所有int，而不是字符串。任何人都有任何想法如何判断数组是否只包含数字从字符串，可能使用for循环？然后我可以把它们所有的数组中的整数，并做这种方式排序。

I can't start the array with all ints instead of strings unfortunately. Anyone have any ideas on how to tell if the array contains ONLY numbers from strings, maybe using a for loop? Then I could just convert them all to ints within the array and do the sort that way. Or maybe there is an easy way I am missing?

如果有人有任何想法，请告诉我。

Let me know if anyone has any ideas.

推荐答案

您可以使用NSString比较函数中的 NSNumericSearch 选项对字符串进行数字排序。要使用NSArray执行此操作，您需要编写一个块或函数来调用 compare：options：方法。

You can use the NSNumericSearch option to the NSString compare function to sort strings numerically. To do this with an NSArray, you will need to write a block or function to call the compare:options: method.

NSArray *theStrings; // Contains strings, some of which are numbers
NSArray *theSortedStrings = [theStrings sortedArrayUsingComparator:^(id obj1, id obj2) {
    return [(NSString *)obj1 compare:(NSString *)obj2 options:NSNumericSearch];
}];

如果字符串中有一个数字， abcd89将在abcd123之前。

This will also sort numerically if there is a numer within a string, i.e. "abcd89" will come before "abcd123".

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