Added custom swift plugin

Summary: Our very own SeaMammal plugin for iOS written in swift

Reviewed By: passy

Differential Revision: D15199381

fbshipit-source-id: 10b085c314328ff52ae3f5feef51f70d0ce12f1b

iOS/Tutorial/Podfile

@@ -0,0 +1,60 @@
+project 'Tutorial.xcodeproj'
+swift_version = "4.1"
+flipperkit_version = '0.20.0'
+use_frameworks!
+
+target 'Tutorial' do
+  platform :ios, '9.0'
+
+  pod 'FlipperKit', '~>' + flipperkit_version
+  # Layout and network plugins are not yet supported for swift projects
+  pod 'FlipperKit/FlipperKitLayoutComponentKitSupport', '~>' + flipperkit_version
+  pod 'FlipperKit/SKIOSNetworkPlugin', '~>' + flipperkit_version
+  pod 'FlipperKit/FlipperKitUserDefaultsPlugin', '~>' + flipperkit_version
+
+  # If you use `use_frameworks!` in your Podfile,
+  # uncomment the below $static_framework array and also
+  # the pre_install section.  This will cause Flipper and
+  # it's dependencies to be static and all other pods to
+  # be dynamic.
+
+  $static_framework = ['FlipperKit', 'Flipper', 'Flipper-Folly',
+    'CocoaAsyncSocket', 'ComponentKit', 'DoubleConversion',
+    'glog', 'Flipper-PeerTalk', 'Flipper-RSocket', 'Yoga', 'YogaKit',
+    'CocoaLibEvent', 'OpenSSL-Static', 'boost-for-react-native']
+
+  pre_install do |installer|
+    Pod::Installer::Xcode::TargetValidator.send(:define_method, :verify_no_static_framework_transitive_dependencies) {}
+    installer.pod_targets.each do |pod|
+      if $static_framework.include?(pod.name)
+        pod.instance_variable_set(:@host_requires_frameworks, false)
+      end
+    end
+  end
+
+
+  # This post_install hook adds the -DFB_SONARKIT_ENABLED flag to OTHER_SWIFT_FLAGS, necessary to build swift target
+  post_install do |installer|
+    file_name = Dir.glob("*.xcodeproj")[0]
+    app_project = Xcodeproj::Project.open(file_name)
+    app_project.native_targets.each do |target|
+        target.build_configurations.each do |config|
+          if (config.build_settings['OTHER_SWIFT_FLAGS'])
+            unless config.build_settings['OTHER_SWIFT_FLAGS'].include? '-DFB_SONARKIT_ENABLED'
+              puts 'Adding -DFB_SONARKIT_ENABLED ...'
+              swift_flags = config.build_settings['OTHER_SWIFT_FLAGS']
+              if swift_flags.split.last != '-Xcc'
+                config.build_settings['OTHER_SWIFT_FLAGS'] << ' -Xcc'
+              end
+              config.build_settings['OTHER_SWIFT_FLAGS'] << ' -DFB_SONARKIT_ENABLED'
+            end
+          else
+            puts 'OTHER_SWIFT_FLAGS does not exist thus assigning it to `$(inherited) -Xcc -DFB_SONARKIT_ENABLED`'
+            config.build_settings['OTHER_SWIFT_FLAGS'] = '$(inherited) -Xcc -DFB_SONARKIT_ENABLED'
+          end
+          app_project.save
+        end
+      end
+      installer.pods_project.save
+  end
+end