Merge pull request #129 from msmollin/app-group-support

Support app groups

SwiftTweaks.podspec

@@ -13,7 +13,7 @@ Pod::Spec.new do |s|
   s.authors            = "Khan Academy", "Bryan Clark"
   s.social_media_url   = "https://twitter.com/khanacademy"
 
-  s.platform     = :ios, "8.0"
+  s.platform     = :ios, "9.0"
 
   s.source       = { :git => "https://github.com/Khan/SwiftTweaks.git", :tag => "v4.0.2", :submodules => true }
   s.source_files = "SwiftTweaks/**/*.swift"

SwiftTweaks/TweakPersistency.swift

@@ -23,8 +23,8 @@ internal final class TweakPersistency {
 
 	private var tweakCache: TweakCache = [:]
 
-	init(identifier: String) {
-		self.diskPersistency = TweakDiskPersistency(identifier: identifier)
+	init(identifier: String, appGroup: String?) {
+		self.diskPersistency = TweakDiskPersistency(identifier: identifier, appGroup: appGroup)
 		self.tweakCache = self.diskPersistency.loadFromDisk()
 	}
 
@@ -62,8 +62,14 @@ internal final class TweakPersistency {
 private final class TweakDiskPersistency {
 	private let fileURL: URL
 
-	private static func fileURLForIdentifier(_ identifier: String) -> URL {
-		return try! FileManager().url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: true)
+	private static func fileURLForIdentifier(_ identifier: String, appGroup: String?) -> URL {
+		guard let appGroupName = appGroup else {
+			return try! FileManager().url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: true)
+				.appendingPathComponent("SwiftTweaks")
+				.appendingPathComponent("\(identifier)")
+				.appendingPathExtension("db")
+		}
+		return FileManager().containerURL(forSecurityApplicationGroupIdentifier: appGroupName)!
 			.appendingPathComponent("SwiftTweaks")
 			.appendingPathComponent("\(identifier)")
 			.appendingPathExtension("db")
@@ -73,11 +79,11 @@ private final class TweakDiskPersistency {
 
 	private static let dataClassName = "TweakDiskPersistency.Data"
 
-	init(identifier: String) {
+	init(identifier: String, appGroup: String?) {
 		NSKeyedUnarchiver.setClass(TweakDiskPersistency.Data.self, forClassName: TweakDiskPersistency.dataClassName)
 		NSKeyedArchiver.setClassName(TweakDiskPersistency.dataClassName, for: TweakDiskPersistency.Data.self)
 
-		self.fileURL = TweakDiskPersistency.fileURLForIdentifier(identifier)
+		self.fileURL = TweakDiskPersistency.fileURLForIdentifier(identifier, appGroup: appGroup)
 		self.ensureDirectoryExists()
 	}
 

SwiftTweaks/TweakStore.swift

@@ -34,8 +34,8 @@ public final class TweakStore {
 
 	/// Creates a TweakStore, with information persisted on-disk. 
 	/// If you want to have multiple TweakStores in your app, you can pass in a unique storeName to keep it separate from others on disk.
-	public init(tweaks: [TweakClusterType], storeName: String = "Tweaks", enabled: Bool) {
-		self.persistence = TweakPersistency(identifier: storeName)
+	public init(tweaks: [TweakClusterType], storeName: String = "Tweaks", enabled: Bool, appGroup: String? = nil) {
+		self.persistence = TweakPersistency(identifier: storeName, appGroup: appGroup)
 		self.storeName = storeName
 		self.enabled = enabled
 		self.allTweaks = Set(tweaks.reduce([]) { $0 + $1.tweakCluster })