Stitch SDK Deprecation Notice

Stitch SDK functionality has been moved into the Realm SDKs. Applications using a Stitch SDK can be migrated to the corresponding Realm SDK by using one of the Stitch SDK Migration Guides. Support for the Stitch SDKs will fully end on November 1, 2021.

MongoDB Stitch iOS/Swift SDK

The official MongoDB Stitch SDK for iOS/Swift.

Documentation

Discussion

Installation

Xcode/iOS

CocoaPods

CocoaPods is a dependency manager for Cocoa projects. You can install it with the following command:

$ gem install cocoapods

Note: CocoaPods 1.6.0+ is required to build the Stitch iOS SDK 5.0+.

To integrate the iOS SDK into your Xcode project using CocoaPods, specify it in your Podfile:

source 'https://github.com/CocoaPods/Specs.git'
platform :ios, '11.0'
use_frameworks!

target '<Your Target Name>' do
    # For core functionality and the Remote MongoDB Service
    pod 'StitchSDK', '= 6.4.0'

    # optional: for using the AWS service
    pod 'StitchSDK/StitchAWSService', '= 6.4.0'
    # optional: for using the Firebase Cloud Messaging service
    pod 'StitchSDK/StitchFCMService', '= 6.4.0'
    # optional: for using the HTTP service
    pod 'StitchSDK/StitchHTTPService', '= 6.4.0'
    # optional: for using the twilio service
    pod 'StitchSDK/StitchTwilioService', '= 6.4.0'
end

Then, run the following command:

$ pod install

Open the .xcworkspace file generated by pod install to access your project with all of its necessary Stitch dependencies automatically linked.

Example Usage

Creating a new app with the SDK (iOS)

Set up an application on Stitch

Go to https://stitch.mongodb.com/ and log in to MongoDB Atlas.
Create a new app in your project with your desired name.
Go to your app in Stitch via Atlas by clicking 'Stitch' in the left side pane and clicking your app.
Copy your Stitch App ID from the top of the left side pane.
Enable anonymous authentication by going to the Users page in the left side pane, selecting the Providers tab, and enabling the "Allow users to log in anonymously" option.

Set up a project in Xcode/CocoaPods using Stitch

Download and install Xcode.
Create a new app project with your desired name. Ensure that Swift is the selected language.

Note: iOS 11.0 is the minimum iOS Deployment Target.

Navigate to the directory of the project in a command line, and run pod init.
In the Podfile that is generated, add the following line under the dependencies for your app target:

    pod 'StitchSDK', '= 6.4.0'

See above for the list of optional Stitch service pods that you may add to your Podfile.

Run pod install.
Open the generated .xcworkspace file. Your app project will have all the necessary dependencies configured to communicate with MongoDB Stitch.
To use basic Stitch features, import StitchCore in a source file.
To create BSON documents and BSON values like ObjectId, import MongoSwift in a source file.
To access a remote MongoDB instance via Stitch, import StitchRemoteMongoDBService in a source file.

Using the SDK

Initialize the SDK

When your app is initialized, run the following code to initialize the Stitch SDK. The application(_:didFinishLaunchWithOptions) method of your AppDelegate.swift can be an appropriate place for this initialization step. Be sure to import StitchCore.

    // at the top of the file
    import StitchCore

    // ...

    // in `application(_:didFinishLaunchWithOptions)`
    do {
        _ = try Stitch.initializeDefaultAppClient(
            withClientAppID: "your-client-app-id"
        )
        print("Successfully initialized default Stitch app client!");
    } catch {
        // note: This initialization will only fail if an incomplete configuration is 
        // passed to a client initialization method, or if a client for a particular 
        // app ID is initialized multiple times. See the documentation of the "Stitch" 
        // class for more details.
        print("Failed to initialize MongoDB Stitch iOS SDK: \(error)")
    }

To get a client to use for logging in and communicating with Stitch, use Stitch.defaultAppClient.

    // in a view controller's properties, for example
    private lazy var stitchClient = Stitch.defaultAppClient!

Logging In

We enabled anonymous log in, so let's log in with it! Add the following anywhere in your code:

let client = Stitch.defaultAppClient!

print("logging in anonymously")
client.auth.login(withCredential: AnonymousCredential()) { result in
      switch result {
      case .success(let user):
          print("logged in anonymous as user \(user.id)")
          DispatchQueue.main.async {
              // update UI accordingly
          }
      case .failure(let error):
          print("Failed to log in: \(error)")
      }
  }

Now run your app in Xcode by going to product, Run (or hitting ⌘R).
Once the app is running, open up the Debug Area by going to View, Debug Area, Show Debug Area.
You should see log messages like:

logging in anonymously                                                      
logged in anonymously as user 58c5d6ebb9ede022a3d75050

Executing a Function

Once logged in, you can execute a Stitch Function with the StitchClient's callFunction() method:

    client.callFunction(
        withName: "echoArg", withArgs: ["Hello world!"], withRequestTimeout: 5.0
    ) { (result: StitchResult<String>) in
        switch result {
        case .success(let stringResult):
            print("String result: \(stringResult)")
        case .failure(let error):
            print("Error retrieving String: \(String(describing: error))")
        }
    }

If you've configured your Stitch application to have a function named "echoArg" that returns its argument, i.e.:

// Stitch Function called 'echoArg'
exports = function(arg) {
  return arg;
};

Then you should see a message in the Xcode Debug Area like:

String result: Hello world!

Getting a StitchAppClient without Stitch.defaultAppClient

In the case that you don't want a single default initialized StitchAppClient, you can use the following with as many client app IDs as you'd like to initialize clients for multiple app IDs:

    do {        
        let client1 = try Stitch.initializeAppClient(withClientAppID: "your-first-client-app-id")

        let client2 = try Stitch.initializeAppClient(withClientAppID: "your-second-client-app-id")
    } catch {
        print("Failed to initialize MongoDB Stitch iOS SDK: \(error.localizedDescription)")
    }

You can use the client returned there or anywhere else in your app you can use the following:

let client1 = try! Stitch.appClient(forAppID: "your-first-client-app-id")
let client2 = try! Stitch.appClient(forAppID: "your-second-client-app-id")

mongodb / stitch-ios-sdk

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