Ionic remove white blank space above keyboard

I am building an app using ionic framework. I got two issues.

  1. I am getting a blank white space above keyboard.

enter image description here

  1. White screen appears after splash screen and before app loading. I have tried the below mentioned code. But no use of it.
<preference name="ShowSplashScreenSpinner" value="false" />
<preference name="AutoHideSplashScreen" value="false" />

How to avoid the white screen before app loading and how to avoid the blank space above the keyboard transition.

Thanks, Raj.