Selenium Webdriver (Appium) - switching to a UIWebview in a Hybrid app (iOS) - selenium

Question

I am using a hybrid app and writing tests using Appium + Selenium Webdriver in Ruby.
I start my test with some textbox editing + click a button to open the UIWebview (so far everything works). The problem is when the UIWebview is opened - I cannot access it (it is immediately closed when I'm trying to click a html element (I am using Appium inspector to find elements and to record my Ruby test). I understand that I have to switch to the UIWebview (as I found here), but I cannot make it to work.
Code example:
require 'rubygems'
require 'selenium-webdriver'
capabilities = {
'browserName' => 'iOS',
'platform' => 'Mac',
'version' => '7.1',
'device' => 'iPhone Retina (4-inch)',
'app' => '/Users/{my user here}/Library/Developer/Xcode/DerivedData/{path here}/Build/Products/Debug-iphonesimulator/SDK.app'
}
server_url = "http://127.0.0.1:4723/wd/hub"
#wd = Selenium::WebDriver.for(:remote, :desired_capabilities => capabilities, :url => server_url)
# ...
# Do all kind of native actions here
# ...
#wd.find_element(:name, "showWebviewButton").click
#wd.manage.timeouts.implicit_wait = 30 # seconds
# ???
# How do I switch to my UIWebview here???
# (cannot access html elements here with #wd.find_element(:name, "htmlElement"))
# ???
#wd.quit
EDIT:
Using Appium inspector I found that my UIWebview is "window(1) ", so I tried:
#wd.switch_to.window(1)
This gives me the error:
A request to switch to a different window could not be satisfied because the window could not be found
(The error is thrown before the UIWebview is loaded)

Answer 1

It seems , you are switching to WebView before it loads. Please pause the script for some time and then switch to the WebView after it appears.

Answer 2

I have tried the following in java and worked fine for me, you may need to find the ruby version of the same.
driver.switchTo().window("WEBVIEW");
try this
#wd.switch_to.window("WEBVIEW") // i am not sure about the syntax

Answer 3

You need to access the element as shown below
findElement(By.xpath("//input[#name='firstName']"))

Answer 4

The only solution that finally worked for me (using Appium 1.2) is (taken from here, written in node.js)
// javascript
// assuming we have an initialized `driver` object for an app
driver
.contexts().then(function (contexts) { // get list of available views. Returns array: ["NATIVE_APP","WEBVIEW_1"]
return driver.context(contexts[1]); // choose the webview context
})
// do some web testing
.elementsByCss('.green_button').click()
.context('NATIVE_APP') // leave webview context
// do more native stuff here if we want
.quit() // stop webdrivage
In the above link you could find the solution written in other languages.