I have 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
I'm getting, as you would expect:
file1
file10
file11
file12
file2
file3
...
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.
An object representing a static ordered collection, for use instead of an Array constant in cases that require reference semantics.
arrays can't contain nil.
NSString
s can be compared using the NSNumericSearch compare option.
One version:
NSInteger sort(Obj* a, Obj* b, void*) { return [[a title] compare:[b title] options:NSNumericSearch]; } result = [array sortedArrayUsingFunction:&sort context:nil];
Or a bit more generic:
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"]
Or using blocks:
result = [array sortedArrayUsingComparator:^(Obj* a, Obj* b) { return [[a title] compare:[b title] options:NSNumericSearch]; }];
Those attempting to replicate the Finder's sorting behavior on Mac OS X 10.6 and later and iOS 4 and later can use localizedStandardCompare:
as the comparator selector.
Those with the same goal on earlier versions of Mac OS X and/or iOS should use the solution described in the String Programming Guide.
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