I found some solutions to change the color of the spinner on iOS:
How to show custom Splash Screen Spinner (i.e spinner with white color) in iOS phonegap app?
<<?xml version="1.0" encoding="utf-8"?>
<rotate xmlns:android="http://schemas.android.com/apk/res/android"
android:pivotX="50%" android:pivotY="50%" android:fromDegrees="0"
android:toDegrees="360">
<shape android:shape="ring" android:innerRadiusRatio="3"
android:thicknessRatio="8" android:useLevel="false">
<size android:width="76dip" android:height="76dip" />
<gradient android:type="sweep" android:useLevel="false"
android:startColor="yourcolor"
android:endColor="yourcolor"
android:angle="0"
/>
</shape>
</rotate>
Save in drawable folder.
Then add this in your java code
progressBar.setIndeterminateDrawable(R.drawable.customspinner);
or
progressBar.setBackground(R.drawable.customspinner);
add this line in your project config.xml file .
<preference name="TopActivityIndicator" value="white"/>