Have you conducted automated testing of interface markup elements?

Yes, automated testing of interface layout elements in iOS is usually performed using UI tests with the XCTest framework. This allows checking for the presence, positioning, and interaction with interface elements such as buttons, text fields, and other components.

A simple UI test example in Swift:

func testButtonExists() {
    let app = XCUIApplication()
    app.launch()
    let button = app.buttons["submitButton"]
    XCTAssertTrue(button.exists, "The submit button should be present on the screen")
}

This approach helps ensure that the interface functions correctly after code changes.