how to Detect if Keyboard is shown in Xcode UI test

Add two observers

NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardVisible:", name: UIKeyboardDidShowNotification, object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardHidden:", name: UIKeyboardDidHideNotification, object: nil)

func keyboardVisible(notif: NSNotification) {
    print("keyboardVisible")
}

func keyboardHidden(notif: NSNotification) {
    print("keyboardHidden")
}

Whenever the keyboard is visible keyboardVisible will be called and whenever the keyboard is hidden keyboardHidden will be called.

Try this check:

let app = XCUIApplication()
XCTAssert(app.keyboards.count > 0, "The keyboard is not shown")

Or check for specific keyboard keys like:

let app = XCUIApplication()
XCTAssert(app.keyboards.buttons["Next:"].exists, "The keyboard has no Next button")

You can also control interactions on the keyboard:

let app = XCUIApplication()
app.keyboards.buttons["Next:"].tap()