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Implement recommendFriendsCallback

docs/codelabs/integration_with_native/ios_swift/4-ios_recommendfriendscallback.md

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Implement recommendFriendsCallback

It is time to actually do the thing we came here to do! Lets replace our dummyRecommendFriendsCallback callback with a real callback:

swift
let friendsCallback: ((@escaping ([SCCHelloWorldFriend]) throws -> Void) throws -> String) = { completion in
    snapchatterServices.snapchattersDataFetcher.target()?.suggestedSnapchatters(for: .addFriends, completionQueue: DispatchQueue.main) { snapchatters, error in
        var friends = [SCCHelloWorldFriend]()
        if error == nil, let snapchatters = snapchatters, !snapchatters.isEmpty {
            for snapchatter in snapchatters {
                guard let displayName = snapchatter.displayName else { continue }
                let friend = SCCHelloWorldFriend(name: displayName)
                friends.append(friend)
            }
        }
        do {
            try completion(friends)
        } catch {
            // Handle error
        }
    }
    return "Success"
}

Then use this as the recommendFriendsCallback when creating SCCHelloWorldContext:

swift
let context = SCCHelloWorldContext(title: "HelloWorld", recommendFriendsCallback: friendsCallback)

That's it. That's the last step.

We request some suggested friends from the snapchattersDataFetcher and then when we get them, we iterate through, format the friends into Friends, and put them in an array. Then call the completion with the list.

Rebuild your app, load up the page, make some friends.

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