One possible solution is to try to changing the cssClass in your code behind.
// instance of button or provide your XML-element with getViewById()
As I don't have your project to work with I can not test if that will solve your issue. However if you need further assistance please provide us with a sample code to reproduce the behaviour.
p.p. You can also set your Button text color explicitly for iOS
app = require(
// to ensure your code will run on in ios app
myButton = page.getViewById(
myButton.ios.tintColor = UIColor.redColor();
// text color
myButton.ios.backgroundColor = UIColor.blackColor();
// background color
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