Sort array of custom objects by date swift

Question

I have a custom object "Meeting" I am adding all the objects in an array. What I want to do is sort the array from Meeting.meetingDate.

I'm also using Parse, I have two queries and putting the results into one array.

I am able to add the data to "meetingData", but not sort it.

Can anyone help with this?

So my array is:

var meetingsData = [Meeting]() 

The Meeting class is:

public class Meeting: PFObject, PFSubclassing {    @NSManaged public var meetingTitle: String?   @NSManaged public var meetingLocation: String?   @NSManaged public var meetingNotes: String?   @NSManaged public var meetingDuration: String?   @NSManaged public var createdBy: User?   @NSManaged public var meetingTime: NSDate?   @NSManaged public var meetingDate: NSDate?  } 

The contents of the array is like so:

<Meeting: 0x125edd040, objectId: xIqx7MoRd6, localId: (null)> { createdBy = "<PFUser: 0x125d627c0, objectId: RKCWJRj84O>"; meetingDate = "2015-08-29 17:07:12 +0000"; meetingDuration = "2 hours 2 mins"; meetingLocation = 4th Floor; meetingNotes = With Investors; meetingTime = "2015-08-24 09:00:17 +0000"; meetingTitle = Meeting with Investors; } <Meeting: 0x125ed95f0, objectId: tz4xx5p9jB, localId: (null)> { createdBy = "<PFUser: 0x125d627c0, objectId: RKCWJRj84O>"; meetingDate = "2015-08-23 23:00:00 +0000"; meetingDuration = "1 hour"; meetingLocation = "Emirates Stadium, London"; meetingNotes = "Football"; meetingTime = "2000-01-01 20:00:00 +0000"; meetingTitle = "Liverpool V Arsenal"; } <Meeting: 0x125ed95f0, objectId: tz4xx5p9jB, localId: (null)> { createdBy = "<PFUser: 0x125d627c0, objectId: RKCWJRj84O>"; meetingDate = "2015-09-23 23:00:00 +0000"; meetingDuration = "1 hour"; meetingLocation = "Library"; meetingNotes = "Dev Team"; meetingTime = "2000-01-01 10:00:00 +0000"; meetingTitle = "Code Review"; } 

I have tried to do this Swift how to sort array of custom objects by property value but it doesn't work

Thanks in advance

Answer 1

NSDate can't be compared with < directly. You can use NSDate's compare method, like in the following code:

meetingsData.sort({ $0.meetingDate.compare($1.meetingDate) == .OrderedAscending }) 

In the above code you can change the order of the sort using the NSComparisonResult enum, that in Swift is implemented like the following:

enum NSComparisonResult : Int {    case OrderedAscending    case OrderedSame    case OrderedDescending } 

I hope this help you.

Answer 2

For Swift 3

meetingsData.sort(by: { $0.meetingDate.compare($1.meetingDate) == .orderedAscending}) 

OR

As dates are now directly comparable in Swift 3, For example.

   let firstDate = Date()    let secondDate = Date()     if firstDate < secondDate {        } else if firstDate == secondDate {            } else if firstDate > secondDate {            }