LaunchDarkly SDK for iOS

Installation

LaunchDarkly supports multiple methods for installing the library in a project.

Installation with CocoaPods

CocoaPods is a dependency manager for Objective-C, which automates and simplifies the process of using 3rd-party libraries like LaunchDarkly in your projects. You can install it with the following command:

$ gem install cocoapods

Podfile

To integrate LaunchDarkly into your Xcode project using CocoaPods, specify it in your Podfile:

source 'https://github.com/CocoaPods/Specs.git'
platform :ios, '8.0'

target 'TargetName' do
pod 'LaunchDarkly'
end

Then, run the following command:

$ pod install

Installation with Carthage

Carthage is a decentralized dependency manager that builds your dependencies and provides you with binary frameworks.

You can install Carthage with Homebrew using the following command:

$ brew update
$ brew install carthage

To integrate LaunchDarkly into your Xcode project using Carthage, specify it in your Cartfile:

github "launchdarkly/ios-client"

Run carthage to build the framework and drag the built Darkly.framework into your Xcode project.

Quick setup

1. Add the SDK to your Podfile:

    pod `LaunchDarkly`
   

2. Import the LaunchDarkly client:

    #import "LDClient.h"
   

3. Instantiate a new LDClient with your mobile key and user:

    LDConfig *config = [[LDConfig alloc] initWithMobileKey: @"YOUR_MOBILE_KEY"];
   
    LDUserBuilder *user = [[LDUserBuilder alloc] init];
    user.key = @"aa0ceb";
   
    [[LDClient sharedInstance] start:config withUserBuilder:user];
   

(Be sure to use a mobile key from your environments. Never embed a standard SDK key into a mobile application.)

Your first feature flag

1. Create a new feature flag on your dashboard

2. In your application code, use the feature’s key to check whether the flag is on for each user:

    BOOL showFeature = [[LDClient sharedInstance] boolVariation:@"YOUR_FLAG_KEY" fallback:NO];
    if (showFeature) {
            NSLog(@"Showing feature for %@", user.key);
    } else {
            NSLog(@"Not showing feature for user %@", user.key);
    }
   

Manage the feature on your dashboard — control who sees the feature without re-deploying your application!

Learn more

Check out our documentation for in-depth instructions on configuring and using LaunchDarkly. You can also head straight to the complete reference guide for this SDK.

Testing

We run integration tests for all our SDKs using a centralized test harness. This approach gives us the ability to test for consistency across SDKs, as well as test networking behavior in a long-running application. These tests cover each method in the SDK, and verify that event sending, flag evaluation, stream reconnection, and other aspects of the SDK all behave correctly.

Contributing

See Contributing

About LaunchDarkly

• LaunchDarkly is a continuous delivery platform that provides feature flags as a service and allows developers to iterate quickly and safely. We allow you to easily flag your features and manage them from the LaunchDarkly dashboard. With LaunchDarkly, you can:
  • Roll out a new feature to a subset of your users (like a group of users who opt-in to a beta tester group), gathering feedback and bug reports from real-world use cases.
  • Gradually roll out a feature to an increasing percentage of users, and track the effect that the feature has on key metrics (for instance, how likely is a user to complete a purchase if they have feature A versus feature B?).
  • Turn off a feature that you realize is causing performance problems in production, without needing to re-deploy, or even restart the application with a changed configuration file.
  • Grant access to certain features based on user attributes, like payment plan (eg: users on the ‘gold’ plan get access to more features than users in the ‘silver’ plan). Disable parts of your application to facilitate maintenance, without taking everything offline.
• LaunchDarkly provides feature flag SDKs for
  • Java
  • JavaScript
  • PHP
  • Python
  • Python Twisted
  • Go
  • Node.JS
  • .NET
  • Ruby
  • iOS
  • Android
• Explore LaunchDarkly
  • launchdarkly.com for more information
  • docs.launchdarkly.com for our documentation and SDKs
  • apidocs.launchdarkly.com for our API documentation
  • blog.launchdarkly.com for the latest product updates
  • Feature Flagging Guide for best practices and strategies