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I have a class that includes an "updated order" property, and an array containing instances of that class. I want that array to be sorted based on the updated order of each of its elements. How can I do that?

TwoStraws
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Ryohei Arai
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  • Do you mean "the objects in my array have a date property that marks when they were last updated; I want the array to be sorted by that date"? – TwoStraws Dec 18 '15 at 09:15
  • May be you are looking something similar to [this](http://stackoverflow.com/a/31729654/2955078) – Akhilrajtr Dec 18 '15 at 09:21

1 Answers1

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Following OP's clarification of what they want, they have a class or struct similar to this:

struct CustomObj {
    var title: String
    var date: NSDate
}

…and they looking to sort an array of such instances based on the date property. Here's how it's done:

array.sortInPlace { (obj1, obj2) -> Bool in
    return obj1.date.compare(obj2.date) == NSComparisonResult.OrderedAscending
}

You can test that it works using some example data:

array.append(CustomObj(title: "Testing 1", date: NSDate(timeIntervalSinceNow: 5000)))
array.append(CustomObj(title: "Testing 2", date: NSDate(timeIntervalSinceNow: 2000)))
array.append(CustomObj(title: "Testing 3", date: NSDate(timeIntervalSinceNow: 4000)))
array.append(CustomObj(title: "Testing 4", date: NSDate(timeIntervalSinceNow: 3000)))
array.append(CustomObj(title: "Testing 5", date: NSDate(timeIntervalSinceNow: 1000)))

print(array)

That will order the items 5, 2, 4, 3, 1.

TwoStraws
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