List wheels = driver.findElements(MobileBy.className("XCUIElementTypePickerWheel"))
Point p1=wheels.get(0).getLocation()
Dimension d1 = wheels.get(0).getSize()
//-100 scrolls up (taps the value below the currently selected value)
driver.tap(1, p1.getX(), p1.getY() + d1.getHeight() -100, 500)
//+100 scrolls down (taps the value above the currently selected value)
driver.tap(1, p1.getX(), p1.getY() +100, 500)
