Sorting NSArray containing NSDate objects

Question

I have an array containing NSDate objects. With Objective-C, I am able to sort this array by using:

NSArray *array = [unsortedArray sortedArrayUsingSelector:@selector(compare:)]

I'm wondering if there's a Swift equivalent of doing this same thing. Relatively new to Swift here, hacking my way through.

nRewik · Accepted Answer · 2015-12-28 04:41:35Z

2

If you use Swift array.

let datesArray = [ NSDate(), NSDate(timeIntervalSinceNow: 60), NSDate(timeIntervalSinceNow: -60) ]
let sorter: (NSDate, NSDate) -> Bool = { $0.compare($1) == .OrderedAscending }
let sortedDatesArray = datesArray.sort(sorter)

answered Dec 28, 2015 at 4:41

nRewik

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Leo Dabus · Accepted Answer · 2015-12-30 04:36:10Z

2

You can make your NSDate conform to protocol Comparable and then you can just compare it the same way you do with number data type:

extension NSDate: Comparable {}

public func <(lhs: NSDate, rhs: NSDate) -> Bool {
    return lhs.compare(rhs) == .OrderedAscending
}

var dates = [NSDate(),NSDate(timeIntervalSinceNow: -600)]   // ["Dec 28, 2015, 2:48 AM", "Dec 28, 2015, 2:38 AM"]
dates.sortInPlace(<)
dates // ["Dec 28, 2015, 2:38 AM", "Dec 28, 2015, 2:48 AM"]

edited Dec 30, 2015 at 4:36

answered Dec 28, 2015 at 4:48

Leo Dabus

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1 Comment

Ron Buencamino Over a year ago

Nice job on showing the extension, this is an elegant solution

Code Different · Accepted Answer · 2015-12-28 04:26:47Z

1

Using the native Array type in Swift. If you are interfacing with legacy code from ObjC, use this:

let array = unsortedArray.sortedArrayUsingSelector("compare:")

answered Dec 28, 2015 at 4:26

Code Different

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1 Comment

Ron Buencamino Over a year ago

thanks! i overlooked putting in the colon after the selector name.

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