Sorting NSMutableArray By Object's Property
Solution 1
NSSortDescriptors
s make this really simple. With NSMutableArray
you can sort the existing array using sortUsingDescriptors:
and with immutable arrays you create a new array using sortedArrayUsingDescriptors:
//This will sort by stringProperty ascending, then dateProperty ascending
[mutable_array sortUsingDescriptors:
@[
[NSSortDescriptor sortDescriptorWithKey:@"stringProperty" ascending:YES],
[NSSortDescriptor sortDescriptorWithKey:@"dateProperty" ascending:YES]
]];
Solution 2
This little snippet worked great for me:
[students sortUsingDescriptors:@[[NSSortDescriptor sortDescriptorWithKey:@"name" ascending:YES]]];
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Rich Haygren
Updated on June 06, 2022Comments
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Rich Haygren almost 2 years
So this is a rather basic question regarding the best way to sort an
NSMutableArray
of custom objects.I have a an
NSMutableArray
of custom objects, each object with anNSString
andNSDate
that go together. I need to sort the array by the newest object (so latestNSDate
), and I'm pretty sure I could simply useNSDate compare: NSDate
if this was an array of justNSDate
, but since I need all objects to be sorted and not just the date, I'm not sure if I can use that method.In terms of pseudo-code, I need to: Look at individual object, determine if the current object's
NSDate
is the next biggest in the array, and if it is, move the object, not just the date.Again, this is something I was even hesitant to ask since it's so basic but I don't want to go writing some grossly inefficient method if there is a pre-existing class method that will essentially do what I want, search an array of object's sub properties and sort the objects according to the subproperties.
Thanks for any help.
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Rich Haygren over 12 yearsThanks, that seems to be just what I'm looking for!
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Rich Haygren over 12 yearsLooks like I should have done a little more research too, this question was exactly my problem as well for anyone in the future: stackoverflow.com/questions/6083408/…