require 'appium_capybara'
desired_caps_ios = {
  platform:        "Mac",
  deviceName:      "iPhone Simulator",
  platformName:    "iOS",
  platformVersion: "12.4",
  app:             "full/path/to/app.zip"
}
url = "https://localhost:4723/wd/hub" # or a sauce labs url
Capybara.register_driver(:appium) do |app|
    appium_lib_options = {
      server_url: url
    }
    all_options = {
      appium_lib: appium_lib_options,
      caps: desired_caps_ios
    }
    Appium::Capybara::Driver.new app, all_options
end
Capybara.default_driver = :appium

Capybara.server_host = '0.0.0.0' # Listen to all interfaces
Capybara.server_port = 56844     # Open port TCP 56844, change at your convenience

capy_driver = Capybara.current_session.driver
# Calls methods defined in Appium::Capybara::Driver and Capybara::Selenium::Driver
capy_driver.find_custom :name, '<enter text>'
# Calls methods defined in only appium_lib (Appium::Driver)
capy_driver.appium_driver.find_element(:name, 'TextFields').click
capy_driver.appium_driver.hide_keyboard