ios: allow example app users to configure API URL and key (#87)

examples/swift/hello_world/BUILD

@@ -41,7 +41,7 @@ ios_application(
         "ipad",
     ],
     infoplists = ["Info.plist"],
-    minimum_os_version = "13.0",
+    minimum_os_version = "16.0",
     provisioning_profile = select({
         "//bazel:ios_device_build": "//bazel/ios:ios_provisioning_profile",
         "//conditions:default": None,
@@ -71,7 +71,7 @@ ios_application(
         "ipad",
     ],
     infoplists = ["Info.plist"],
-    minimum_os_version = "13.0",
+    minimum_os_version = "16.0",
     provisioning_profile = select({
         "//bazel:ios_device_build": "//bazel/ios:ios_provisioning_profile",
         "//conditions:default": None,

examples/swift/hello_world/Configuration.swift

@@ -0,0 +1,38 @@
+// capture-sdk - bitdrift's client SDK
+// Copyright Bitdrift, Inc. All rights reserved.
+//
+// Use of this source code is governed by a source available license that can be found in the
+// LICENSE file or at:
+// https://polyformproject.org/wp-content/uploads/2020/06/PolyForm-Shield-1.0.0.txt
+
+import Combine
+import Foundation
+
+final class Configuration: ObservableObject {
+    @Published var apiURL: String
+    @Published var apiKey: String
+
+    private var subscriptions = Set<AnyCancellable>()
+
+    static var storedAPIURL: String {
+        get { UserDefaults.standard.string(forKey: "apiURL") ?? "https://api.bitdrift.io" }
+        set { UserDefaults.standard.setValue(newValue, forKey: "apiURL") }
+    }
+
+    static var storedAPIKey: String? {
+        get { UserDefaults.standard.string(forKey: "apiKey") }
+        set { UserDefaults.standard.setValue(newValue, forKey: "apiKey") }
+    }
+
+    init() {
+        self.apiURL = Self.storedAPIURL
+        self.apiKey = Self.storedAPIKey ?? ""
+
+        $apiURL
+            .sink(receiveValue: { Self.storedAPIURL = $0 })
+            .store(in: &self.subscriptions)
+        $apiKey
+            .sink(receiveValue: { Self.storedAPIKey = $0 })
+            .store(in: &self.subscriptions)
+    }
+}

examples/swift/hello_world/ConfigurationView.swift

@@ -0,0 +1,28 @@
+// capture-sdk - bitdrift's client SDK
+// Copyright Bitdrift, Inc. All rights reserved.
+//
+// Use of this source code is governed by a source available license that can be found in the
+// LICENSE file or at:
+// https://polyformproject.org/wp-content/uploads/2020/06/PolyForm-Shield-1.0.0.txt
+
+import SwiftUI
+
+struct ConfigurationView: View {
+    @StateObject var configuration = Configuration()
+
+    var body: some View {
+        Text("API URL").frame(maxWidth: .infinity)
+        TextField(text: $configuration.apiURL) { Text("Enter API URL") }
+            .autocapitalization(.none)
+
+        Text("API Key").frame(maxWidth: .infinity)
+        TextField(text: $configuration.apiKey, axis: .vertical) { Text("Enter API Key") }
+            .autocapitalization(.none)
+
+        Spacer()
+
+        Text("The app needs to be restarted for any configuration change to take effect.")
+            .font(.caption2)
+            .padding(EdgeInsets(top: 10, leading: 10, bottom: 20, trailing: 10))
+    }
+}

examples/swift/hello_world/ContentView.swift

@@ -24,6 +24,7 @@ struct ContentView: View {
 
     var body: some View {
         VStack {
+            NavigationLink("Configuration") { ConfigurationView() }
             Spacer()
             VStack {
                 Text("ACTIONS")

examples/swift/hello_world/LoggerCustomer.swift

@@ -9,9 +9,6 @@ import Capture
 import Foundation
 import MetricKit
 
-private let kBitdriftAPIKey = "<YOUR API KEY GOES HERE>"
-// swiftlint:disable:next force_unwrapping use_static_string_url_init
-private let kBitdriftURL = URL(string: "https://api.bitdrift.io")!
 private let kDeviceId = "ios-helloworld"
 
 private struct EncodableExampleStruct: Encodable {
@@ -83,21 +80,26 @@ final class LoggerCustomer: NSObject, URLSessionDelegate {
     override init() {
         self.appStartTime = Date()
 
+        super.init()
+
+        guard let apiURL = URL(string: Configuration.storedAPIURL) else {
+            print("failed to initialize logger due to invalid API URL: \(Configuration.storedAPIURL)")
+            return
+        }
+
         Logger
             .start(
-                withAPIKey: kBitdriftAPIKey,
+                withAPIKey: Configuration.storedAPIKey ?? "",
                 sessionStrategy: .fixed(),
                 configuration: .init(),
                 fieldProviders: [CustomFieldProvider()],
-                apiURL: kBitdriftURL
+                apiURL: apiURL
             )?
             .enableIntegrations([.urlSession()], disableSwizzling: true)
 
         Logger.addField(withKey: "field_container_field_key", value: "field_container_value")
         Logger.logInfo("App launched. Logger configured.")
 
-        super.init()
-
         MXMetricManager.shared.add(self)
     }