Swift check if an array of objects contains an object of another array

Question

I am using two arrays:

var facebookFriends: [FacebookFriend] = []

var friendsToInvite: [FacebookFriend]!

The first array contains all the Facebook friends and the second one contains objects FacebookFriend which have selected in a different ViewController.

Both of the arrays are instantiated correctly in the ViewController.

In the -tableView:cellForRowAtIndexPath delegate method I want to change the cell view if the Facebook friend from the facebookFriends array is contained in the friendsToInvite array.

In order to acheive that, I have tried the following:

if(friendsToInvite.contains(facebookFriends[indexPath.row])) {
    // Code to change the view of the cell
 }

But I get the following error:

Cannot subscript a value of type '[FacebookFriend]'.

Is there any other way to check if this object is contained in the array?

I have created my own class ` FacebookFriend ` and I use the following constructor in order to create an object: ` init(facebookId: String, facebookUsername: String, profilePicture: NSData) { self.facebookId = facebookId self.facebookUsername = facebookUsername self.profilePicture = profilePicture } ` — PV169
– PV169, Commented Jan 19, 2016 at 10:11

Michaël Azevedo · Accepted Answer · 2016-01-19 10:21:42Z

2

Your FacebookFriendclass must conform to Equatableprotocol in order to have the contains() method to work. This protocol allows the comparison of objects .

Let's do it with a simplified facebookFriendclass :

class facebookFriend {

    let name:String
    let lastName:String

    init(name:String, lastName:String) {
        self.name = name
        self.lastName = lastName
    }

}

You can conform to Equatable protocol quite easily :

extension facebookFriend: Equatable {}

    func ==(lhs: facebookFriend, rhs: facebookFriend) -> Bool {
        let areEqual = lhs.name == rhs.name &&
        lhs.lastName == rhs.lastName
        return areEqual
    }
}

answered Jan 19, 2016 at 10:21

Michaël Azevedo

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Comments

Ankit Thakur · Accepted Answer · 2016-01-19 10:23:51Z

-1

You can make a filter using

let friend:FacebookFriend = facebookFriends[indexPath.row]
var filteredArray = friendsToInvite.filter( { (inviteFriend: FacebookFriend) -> Bool in
        return inviteFriend.userID == friend.userID
    });

if(count(filteredFriend) > 0){
  // friend exist
}
else{
  // friend does not exist
}

answered Jan 19, 2016 at 10:23

Ankit Thakur

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