If your problem is on android, maybe this will help you. In the ionic config.xml, add the following lines in the platform name=“android” tag.
<platform name="android">
<edit-config file="AndroidManifest.xml" mode="merge" target="/manifest/application/activity"> <activity android:windowSoftInputMode="adjustPan" /></edit-config>
...the rest of the android configs...
</platform>
This will prevent the keyboard to push up everything and simple overlay the keyboard on the content. So the behaviour will be the same or similar to the ios keyboard