Can we integrate apollo graph QL SDK in existing Objective C projects?

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1

Hi Team,
We have developed a product using Objective C code, now we want to integrate integrate apollo graph QL SDK in the product so we can do it?

2

It’s possible, but it’ll be a bit of an uphill battle since the Apollo SDK makes really heavy use of Swift features, particularly structs and generics.

I think the way I’d start is by basically writing an API wrapper in Swift that has one method per query. Then you can use each method to populate ViewModel type objects that are declared (and used) in Objective-C.

So if you had a LoginMutation that looked something like this in GraphQL:

mutation Login($username: String!, $password: String! {
   loginUser(username: $username, password: $password) {
    id
    givenName
    familyName
  }
}

And a class that holds data in Objective-C with a .h file like this:

@class ObjCUser: NSObject 

@property (nonatomic) NSString *id;
@property (nonatomic) NSString *givenName;
@property (nonatomic) NSString *familyName;

- (instancetype)initWithId:(NSString *id) 
                 givenName:(NSString *givenName) 
                familyName:(NSString *familyName);

@end

You could create a wrapper in swift that basically looks like this to call through to it:

@objc
public class ApolloWrapper: NSObject {

    private let apollo = ApolloClient() // This setup is actually longer, keeping it short for this example

    @objc
    public init() {
       super.init()
    }

   @objc
   public func loginUser(username: String, 
                         password: String, 
                         completion: ((ObjCUser?, Error?) -> Void)) {
      let loginMutation = LoginMutation(username: username, password: password)
      apollo.perform(mutation: loginMutation) { result in 
          switch result {
          case .failure(let error): 
              completion(nil, error)
          case .success(let graphQLResult):
               if let generatedUser = graphQLResult.data?.loginUser {
                   let returnUser = ObjCUser(id: generatedUser.id, 
                                      givenName: generatedUser.givenName,
                                      familyName: generatedUser.familyName)
                   completion(returnUser, nil)
               }  // handle any errors returned from the server if needed. 
          }
   }
}

Definitely not as straightforward as being able to just set up your operations and call them, but it’s certainly doable.

3

if possible, Can you please share any sample Objective C application with Apollo SDK?