Swift support for multiple ptd files

Differential Revision: [D82075758](https://our.internmc.facebook.com/intern/diff/D82075758/)

ghstack-source-id: 308661945
Pull Request resolved: #14754

Author: lucylq

extension/apple/ExecuTorch/Exported/ExecuTorchModule.h

@@ -126,27 +126,27 @@ NS_SWIFT_NAME(Module)
  * Initializes a module with a file path, data path and a specified load mode.
  *
  * @param filePath A string representing the path to the ExecuTorch program file.
- * @param dataFilePath A string representing the path to a .ptd file with
+ * @param dataFiles A list of strings representing paths to .ptd files with
  * external tensors and external data.
  * @param loadMode A value from ExecuTorchModuleLoadMode that determines the
  * file loading behavior.
  * @return An initialized ExecuTorchModule instance.
  */
 - (instancetype)initWithFilePath:(NSString *)filePath
-                    dataFilePath:(NSString *)dataFilePath
+                       dataFiles:(NSArray<NSString *> *)dataFiles
                         loadMode:(ExecuTorchModuleLoadMode)loadMode
     NS_DESIGNATED_INITIALIZER;
 
 /**
  * Initializes a module with a file path, data path and a specified load mode.
  *
  * @param filePath A string representing the path to the ExecuTorch program file.
- * @param dataFilePath A string representing the path to a .ptd file with
+ * @param dataFiles A list of strings representing paths to .ptd files with
  * external tensors and external data.
  * @return An initialized ExecuTorchModule instance.
  */
 - (instancetype)initWithFilePath:(NSString *)filePath
-                    dataFilePath:(NSString *)dataFilePath;
+                       dataFiles:(NSArray<NSString *> *)dataFiles;
 
 /**
  * Initializes a module with a file path and a specified load mode.

extension/apple/ExecuTorch/Exported/ExecuTorchModule.mm

@@ -250,13 +250,20 @@ @implementation ExecuTorchModule {
 }
 
 - (instancetype)initWithFilePath:(NSString *)filePath
-                    dataFilePath:(NSString *)dataFilePath
+                       dataFiles:(NSArray<NSString *> *)dataFiles
                         loadMode:(ExecuTorchModuleLoadMode)loadMode {
   self = [super init];
   if (self) {
+    // Convert NSArray<NSString *> to std::vector<std::string>
+    std::vector<std::string> dataFilesVector;
+    if (dataFiles != nil) {
+      for (NSString *dataFile in dataFiles) {
+        dataFilesVector.push_back(dataFile.UTF8String);
+      }
+    }
     _module = std::make_unique<Module>(
       filePath.UTF8String,
-      dataFilePath.UTF8String,
+      dataFilesVector,
       static_cast<Module::LoadMode>(loadMode)
     );
     _inputs = [NSMutableDictionary new];
@@ -266,21 +273,21 @@ - (instancetype)initWithFilePath:(NSString *)filePath
 }
 
 - (instancetype)initWithFilePath:(NSString *)filePath
-                    dataFilePath:(NSString *)dataFilePath {
+                       dataFiles:(NSArray<NSString *> *)dataFiles {
   return [self initWithFilePath:filePath
-                   dataFilePath:dataFilePath
+                      dataFiles:dataFiles
                        loadMode:ExecuTorchModuleLoadModeFile];
 }
 
 - (instancetype)initWithFilePath:(NSString *)filePath
                         loadMode:(ExecuTorchModuleLoadMode)loadMode {
   return [self initWithFilePath:filePath
-                   dataFilePath:@""
+                      dataFiles:@[]
                        loadMode:loadMode];
 }
 - (instancetype)initWithFilePath:(NSString *)filePath {
   return [self initWithFilePath:filePath
-                   dataFilePath:@""
+                      dataFiles:@[]
                        loadMode:ExecuTorchModuleLoadModeFile];
 }