Swift SDK

Flipswitch works with Swift applications through the OpenFeature SDK and its native OFREP provider — no custom Flipswitch package needed.

GitHub: open-feature/swift-sdk · open-feature/ofrep-swift-client-provider

This integration uses the OpenFeature Remote Evaluation Protocol (OFREP), which evaluates flags via polling. Real-time SSE streaming is available in official Flipswitch SDKs.

Requirements

Swift 5.9+
iOS 15+ / macOS 13+

Installation

Add via Swift Package Manager:

https://github.com/open-feature/ofrep-swift-client-provider.git

Quick Start

import OpenFeature
import OFREPProvider

let provider = OFREPProvider(
    baseURL: URL(string: "https://api.flipswitch.io")!,
    headers: ["X-API-Key": "YOUR_API_KEY"]
)

OpenFeatureAPI.shared.setProvider(provider: provider)
let client = OpenFeatureAPI.shared.getClient()

let darkMode = client.getBooleanValue(key: "dark-mode", defaultValue: false)

Evaluation Context

Pass user attributes for targeting:

let context = MutableContext(
    targetingKey: "user-123",
    structure: MutableStructure(attributes: [
        "email": .string("user@example.com"),
        "plan": .string("premium"),
        "country": .string("SE")
    ])
)

let showFeature = client.getBooleanValue(key: "new-feature", defaultValue: false, context: context)

Detailed Evaluation

Get full evaluation details including variant and reason:

let details = client.getBooleanDetails(key: "feature-flag", defaultValue: false, context: context)

print("Value: \(details.value)")
print("Variant: \(details.variant ?? "none")")
print("Reason: \(details.reason ?? "none")")

SwiftUI Integration

import SwiftUI
import OpenFeature

struct FeatureView: View {
    @State private var isEnabled = false

    var body: some View {
        VStack {
            if isEnabled {
                Text("New feature is live!")
            } else {
                Text("Coming soon")
            }
        }
        .onAppear {
            let client = OpenFeatureAPI.shared.getClient()
            isEnabled = client.getBooleanValue(key: "new-feature", defaultValue: false)
        }
    }
}

UIKit Integration

import UIKit
import OpenFeature

class FeatureViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()

        let client = OpenFeatureAPI.shared.getClient()
        let showBanner = client.getBooleanValue(key: "promo-banner", defaultValue: false)

        if showBanner {
            showPromoBanner()
        }
    }
}

Direct OFREP API

You can also call the OFREP endpoints directly via HTTP — see the OFREP protocol reference for details.

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