如何做一个自然排序在一个NSArray？ [英] How to do a natural sort on an NSArray?

问题描述

我有一个对象数组，我需要他们按他们的标题键排序。它目前工作，虽然它使用ASCII排序而不是自然排序。标题是文件名，因此它们如下所示：

I've got an array of objects, and I need them sorted by their "title" key. It's currently working, though it's using an ASCII sort instead of a natural sort. The titles are filenames, so they look like this:

file1

file2

file3

...

file10

file11

file12

file1
file2
file3
...
file10
file11
file12

expect：

file1

file10

file11

file12

file2

file3

...

file1
file10
file11
file12
file2
file3
...

有人知道是否有一种内置于NSArray排序功能的方法得到这个自然排序而不是字母排序？我找到一些通用的算法，但我希望有一些内置的...

Does anyone know if there is a way built-in to the NSArray sorting functionality to get this natural sorting as opposed to the alphabetical sort? I found some generic algorithms, but I was hoping for something built-in...

推荐答案

NSString 可以比较，使用 NSNumericSearch 比较选项。

NSStrings can be compared using the NSNumericSearch compare option.

一个版本：

NSInteger sort(Obj* a, Obj* b, void*) {
    return [[a title] compare:[b title] options:NSNumericSearch];
}

result = [array sortedArrayUsingFunction:&sort context:nil];

或更加通用：

NSInteger sort(id a, id b, void* p) {
    return [[a valueForKey:(NSString*)p] 
            compare:[b valueForKey:(NSString*)p]
            options:NSNumericSearch];
}

result = [array sortedArrayUsingFunction:&sort context:@"title"]

或使用块：

result = [array sortedArrayUsingComparator:^(Obj* a, Obj* b) { 
    return [[a title] compare:[b title] options:NSNumericSearch]; 
}];

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