1. Install  nodejs
2. npm i -g ionic@latest
3. Install  Xcode
4. Install  CocoaPods

1. install nodejs
2. npm i -g ionic@latest
3. install android studio

1. run 'npm i' under project root directory
2. Ionic cordova platform add android && Ionic cordova platform add ios
3. Go to plugins/cordova-plugin-request-location-accuracy/plugin.xml
    Comment out below lines
    <preference name="PLAY_SERVICES_LOCATION_VERSION" default="16.+" />
    <framework src="com.google.android.gms:play-services-location:$PLAY_SERVICES_LOCATION_VERSION" />
    Add new line as below
    <framework src="com.google.android.gms:play-services-location:10.+" />
4. Ionic corodova build android (or) ionic serve

1. Android :
    1. ionic cordova build android --prod --release
    2. Go to "platforms\android\app\build\outputs\apk\debug" and run "jarsigner -verbose -sigalg SHA1withRSA -digestalg SHA1 -keystore my-release-key.keystore <yourapkname>.apk alias_name"
    3. And run this comment in same directoty zipalign -v 4 <yourapkname>.apk <Outputyourapkname>.apk
2. IOS :
    1. ionic cordova build ios --release
    2. Now, open the platforms/ios/<YourAppName>.xcodeproj file in Xcode
    3. select Product -> Archive, and the Archive organizer appears and displays the new archive.At this point you can click the Upload to App Store... button