Add support for string arrays to AppStorage (#107)

Co-authored-by: Stephen Celis <[email protected]>

Author: ph1ps

Sources/Sharing/SharedKeys/AppStorageKey.swift

@@ -60,7 +60,19 @@
     where Self == AppStorageKey<String> {
       AppStorageKey(key, store: store)
     }
-
+    
+    /// Creates a shared key that can read and write to a string array user default.
+    ///
+    /// - Parameters:
+    ///   - key: The key to read and write the value to in the user defaults store.
+    ///   - store: The user defaults store to read and write to. A value of `nil` will use the user
+    ///     default store from dependencies.
+    /// - Returns: A user defaults shared key.
+    public static func appStorage(_ key: String, store: UserDefaults? = nil) -> Self
+    where Self == AppStorageKey<[String]> {
+      AppStorageKey(key, store: store)
+    }
+    
     /// Creates a shared key that can read and write to a URL user default.
     ///
     /// - Parameters:
@@ -188,7 +200,19 @@
     where Self == AppStorageKey<String?> {
       AppStorageKey(key, store: store)
     }
-
+    
+    /// Creates a shared key that can read and write to an optional string array user default.
+    ///
+    /// - Parameters:
+    ///   - key: The key to read and write the value to in the user defaults store.
+    ///   - store: The user defaults store to read and write to. A value of `nil` will use the user
+    ///     default store from dependencies.
+    /// - Returns: A user defaults shared key.
+    public static func appStorage(_ key: String, store: UserDefaults? = nil) -> Self
+    where Self == AppStorageKey<[String]?> {
+      AppStorageKey(key, store: store)
+    }
+    
     /// Creates a shared key that can read and write to an optional URL user default.
     ///
     /// - Parameters:
@@ -333,7 +357,11 @@
     fileprivate init(_ key: String, store: UserDefaults?) where Value == String {
       self.init(lookup: CastableLookup(), key: key, store: store)
     }
-
+    
+    fileprivate init(_ key: String, store: UserDefaults?) where Value == [String] {
+      self.init(lookup: CastableLookup(), key: key, store: store)
+    }
+    
     fileprivate init(_ key: String, store: UserDefaults?) where Value == URL {
       self.init(lookup: URLLookup(), key: key, store: store)
     }
@@ -373,7 +401,11 @@
     fileprivate init(_ key: String, store: UserDefaults?) where Value == String? {
       self.init(lookup: OptionalLookup(base: CastableLookup()), key: key, store: store)
     }
-
+    
+    fileprivate init(_ key: String, store: UserDefaults?) where Value == [String]? {
+      self.init(lookup: OptionalLookup(base: CastableLookup()), key: key, store: store)
+    }
+    
     fileprivate init(_ key: String, store: UserDefaults?) where Value == URL? {
       self.init(lookup: OptionalLookup(base: URLLookup()), key: key, store: store)
     }

Tests/SharingTests/AppStorageTests.swift

@@ -34,7 +34,14 @@
       store.set("Blob, Jr.", forKey: "string")
       #expect(string == "Blob, Jr.")
     }
-
+    
+    @Test func stringArray() {
+      @Shared(.appStorage("stringArray")) var stringArray = ["Blob"]
+      #expect(store.stringArray(forKey: "stringArray") == ["Blob"])
+      store.set(["Blob", "Blob, Jr."], forKey: "stringArray")
+      #expect(stringArray == ["Blob", "Blob, Jr."])
+    }
+    
     @Test func url() {
       @Shared(.appStorage("url")) var url = URL(fileURLWithPath: "/dev")
       #expect(store.url(forKey: "url") == URL(fileURLWithPath: "/dev"))