I have to sort an array of objects by a property of the objects that is a string. How can I do this?
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3 Answers
you need to use
-[NSArray sortedArrayUsingSelector:]
or
-[NSMutableArray sortUsingSelector:] and pass @selector(compare:) as the parameter.
here's a link to the answer Sort NSArray of date strings or objects
Comments
For just sorting array of strings:
sorted = [array sortedArrayUsingSelector:@selector(compare:)];
For sorting objects with key "name":
NSSortDescriptor *sort = [NSSortDescriptor sortDescriptorWithKey:@"name" ascending:YES selector:@selector(compare:)];
sorted = [array sortedArrayUsingDescriptors:@[sort]];
Also, instead of compare: you can use:
caseInsensitiveCompare:localizedCaseInsensitiveCompare:
Comments
Here's what I ended up using - works like a charm:
[categoryArray sortedArrayWithOptions:0
usingComparator:^NSComparisonResult(id obj1, id obj2)
{
id<SelectableCategory> cat1 = obj1;
id<SelectableCategory> cat2 = obj2;
return [cat1.name compare:cat2.name options:NSCaseInsensitiveSearch];
}];
SelectableCategory is just a @protocol SelectableCategory <NSObject> defining the category with all its properties and elements.
