Update MLXChatExample for iOS Sandboxing (#285)

* Add conditional default value for HubApi
* Add sandboxing for macOS

Author: rudrankriyam

Applications/MLXChatExample/Support/HubApi+default.swift

@@ -12,6 +12,13 @@ import Foundation
 extension HubApi {
     /// Default HubApi instance configured to download models to the user's Downloads directory
     /// under a 'huggingface' subdirectory.
+#if os(macOS)
     static let `default` = HubApi(
-        downloadBase: URL.downloadsDirectory.appending(path: "huggingface"))
+        downloadBase: URL.downloadsDirectory.appending(path: "huggingface")
+    )
+#else
+    static let `default` = HubApi(
+        downloadBase: URL.cachesDirectory.appending(path: "huggingface")
+    )
+#endif
 }

MLXChatExample.entitlements

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>com.apple.developer.kernel.increased-memory-limit</key>
+	<true/>
+	<key>com.apple.security.app-sandbox</key>
+	<true/>
+	<key>com.apple.security.files.downloads.read-write</key>
+	<true/>
+	<key>com.apple.security.network.client</key>
+	<true/>
+</dict>
+</plist>

mlx-swift-examples.xcodeproj/project.pbxproj

@@ -190,6 +190,7 @@
 /* End PBXCopyFilesBuildPhase section */
 
 /* Begin PBXFileReference section */
+		0A7C100B2DC37CEA00FD5155 /* MLXChatExample.entitlements */ = {isa = PBXFileReference; lastKnownFileType = text.plist.entitlements; path = MLXChatExample.entitlements; sourceTree = "<group>"; };
 		0AC74EBB2D136221003C90A7 /* VLMEval.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = VLMEval.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		0AC74EC92D13622A003C90A7 /* Preview Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = "Preview Assets.xcassets"; sourceTree = "<group>"; };
 		0AC74ECB2D13622A003C90A7 /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
@@ -522,6 +523,7 @@
 		C39273672B60697700368D5D = {
 			isa = PBXGroup;
 			children = (
+				0A7C100B2DC37CEA00FD5155 /* MLXChatExample.entitlements */,
 				C325DE3F2B648CDB00628871 /* README.md */,
 				F8D7023A2BB4E223003D7CF5 /* Package.swift */,
 				C3C36A6C2CA714600099FFA4 /* Configuration */,
@@ -1311,6 +1313,7 @@
 				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
 				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
+				CODE_SIGN_ENTITLEMENTS = MLXChatExample.entitlements;
 				CODE_SIGN_STYLE = Automatic;
 				COPY_PHASE_STRIP = NO;
 				CURRENT_PROJECT_VERSION = 1;
@@ -1376,6 +1379,7 @@
 				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
 				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
+				CODE_SIGN_ENTITLEMENTS = MLXChatExample.entitlements;
 				CODE_SIGN_STYLE = Automatic;
 				COPY_PHASE_STRIP = NO;
 				CURRENT_PROJECT_VERSION = 1;