Set up iOS SDK

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import LaunchDarkly
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// This is your mobile key.
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let config = LDConfig(mobileKey: "YOUR_MOBILE_KEY", autoEnvAttributes: .enabled)
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// A "context" is a data object representing users, devices, organizations, and other entities.
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let contextBuilder = LDContextBuilder(key: "EXAMPLE_CONTEXT_KEY")
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guard case .success(let context) = contextBuilder.build()
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else { return }
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LDClient.start(config: config, context: context, startWaitSeconds: 5) { timedOut in
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    if timedOut {
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        print("SDK didn't initialize in 5 seconds.  SDK is still running and trying to get latest flags.")
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    } else {
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        print("SDK successfully initialized with the latest flags")
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    }
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}
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print("SDK started.")

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import LaunchDarkly
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// Call this once from your app startup (e.g. application(_:didFinishLaunchingWithOptions:)).
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// You can't invoke LDClient.start() at the top level in Swift — wrap it in a function.
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func startLaunchDarkly() {
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    // This is your mobile key.
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    let config = LDConfig(mobileKey: "YOUR_MOBILE_KEY", autoEnvAttributes: .enabled)
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    // A "context" is a data object representing users, devices, organizations, and other entities.
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    let contextBuilder = LDContextBuilder(key: "EXAMPLE_CONTEXT_KEY")
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    guard case .success(let context) = contextBuilder.build() else { return }
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    LDClient.start(config: config, context: context, startWaitSeconds: 5) { timedOut in
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        if timedOut {
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            print("SDK didn't initialize in 5 seconds. SDK is still running and trying to get latest flags.")
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        } else {
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            print("SDK successfully initialized with the latest flags")
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        }
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    }
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}
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// Call trackMetric when a metric action occurs in your app —
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// a tap, a form submit, a screen view, a custom event, whatever your metric measures.
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func trackMetric(metricKey: String, data: LDValue = .null) {
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    let client = LDClient.get()!
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    client.track(key: metricKey, data: data)
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}