chore: use ffi and pods dependencies for iOS

ios/tflite_flutter.podspec

@@ -1,25 +1,36 @@
 #
 # To learn more about a Podspec see http://guides.cocoapods.org/syntax/podspec.html.
-# Run `pod lib lint tflite_flutter_plugin.podspec' to validate before publishing.
+# Run `pod lib lint tflite_flutter.podspec` to validate before publishing.
 #
 Pod::Spec.new do |s|
   s.name             = 'tflite_flutter'
-  s.version          = '0.1.0'
+  s.version          = '0.0.1'
   s.summary          = 'TensorFlow Lite plugin for Flutter apps.'
   s.description      = <<-DESC
 TensorFlow Lite plugin for Flutter apps.
                        DESC
   s.homepage         = 'http://example.com'
   s.license          = { :file => '../LICENSE' }
   s.author           = { 'Your Company' => 'email@example.com' }
+
+  # This will ensure the source files in Classes/ are included in the native
+  # builds of apps using this FFI plugin. Podspec does not support relative
+  # paths, so Classes contains a forwarder C file that relatively imports
+  # `../src/*` so that the C sources can be shared among all target platforms.
   s.source           = { :path => '.' }
-  s.source_files = 'Classes/**/*'
+  # s.source_files = 'Classes/**/*'
+
   s.dependency 'Flutter'
-  s.platform = :ios, '8.0'
 
-  s.ios.deployment_target = '9.0'
-  s.dependency 'TensorFlowLiteSwift'
-  # Flutter.framework does not contain a i386 slice. Only x86_64 simulators are supported.
-  s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES', 'VALID_ARCHS[sdk=iphonesimulator*]' => 'x86_64' }
+  tflite_version = '2.12.0'
+  s.dependency 'TensorFlowLiteC', tflite_version
+  s.dependency 'TensorFlowLiteC/Metal', tflite_version
+  s.dependency 'TensorFlowLiteC/CoreML', tflite_version
+
+  s.platform = :ios, '11.0'
+  s.static_framework = true
+
+  # Flutter.framework does not contain a i386 slice.
+  s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES', 'EXCLUDED_ARCHS[sdk=iphonesimulator*]' => 'i386' }
   s.swift_version = '5.0'
 end

pubspec.yaml

@@ -51,7 +51,7 @@ flutter:
         package: com.tfliteflutter.tflite_flutter_plugin
         pluginClass: TfliteFlutterPlugin
       ios:
-        pluginClass: TfliteFlutterPlugin
+        ffiPlugin: true
       linux:
         pluginClass: TfliteFlutterPlugin