Enhance Podfile. (#1252)

example/ios/Podfile

@@ -5,9 +5,10 @@ platform :ios, '8.0'
 
 # Change 'AirMapsExplorer' to match the target in your Xcode project.
 target 'AirMapsExplorer' do
+  rn_path = '../../node_modules/react-native'
 
-  pod 'Yoga', :path => '../../node_modules/react-native/ReactCommon/yoga/Yoga.podspec'
-  pod 'React', path: '../../node_modules/react-native', :subspecs => [
+  pod 'Yoga', path: "#{rn_path}/ReactCommon/yoga/Yoga.podspec"
+  pod 'React', path: rn_path, subspecs: [
     'Core',
     'RCTActionSheet',
     'RCTAnimation',
@@ -22,16 +23,14 @@ target 'AirMapsExplorer' do
     'BatchedBridge'
   ]
 
-  pod 'GoogleMaps'  # <~~ remove this line if you do not want to support GoogleMaps on iOS
+  pod 'GoogleMaps'  # Remove this line if you don't want to support GoogleMaps on iOS
   pod 'react-native-maps', path: '../../'
-  pod 'react-native-google-maps', path: '../../'  # <~~ if you need GoogleMaps support on iOS
-
+  pod 'react-native-google-maps', path: '../../'  # If you need GoogleMaps support on iOS
 end
 
-
 post_install do |installer|
   installer.pods_project.targets.each do |target|
-    if target.name == "react-native-google-maps"
+    if target.name == 'react-native-google-maps'
       target.build_configurations.each do |config|
         config.build_settings['CLANG_ENABLE_MODULES'] = 'No'
       end