Added documentation for IASKAppSettingsWebViewController

See: #504

Author: funnel20

README.md

@@ -25,6 +25,7 @@ IASK not only replicates the feature set of system settings but supports a large
 	- [Custom inApp plists](#custom-inapp-plists)
 	- [Privacy link](#privacy-link)
 	- [Open URL](#open-url)
+    - [Web View Controller](#web-view-controller)
 	- [Mail Composer](#mail-composer)
 	- [Button](#button)
 	- [Multiline Text View](#multiline-text-view)
@@ -202,6 +203,32 @@ The [sample application](#sample-application) defines `NSMicrophoneUsageDescript
 InAppSettingsKit adds a new element `IASKOpenURLSpecifier` that allows to open a specified URL using an external application (i.e. Safari or Mail). The URL to launch is specified in the `File` parameter. See the sample `Root.inApp.plist` for details.
 
 
+## Web View Controller
+To open a specified URL inside your application, `IASKAppSettingsWebViewController` displays a fullscreen View Controller with an embedded [`WKWebView`](https://developer.apple.com/documentation/webkit/wkwebview).  
+By default is shows an indeterminate activity indicator on the right side of the Navigation Bar when a page is loading.
+
+The Web View Controller can be defined in the Settings plist by using the following mandatory IASKSpecifier properties:
+
+- `Type`: set to `PSChildPaneSpecifier`
+- `IASKViewControllerClass`: set to `IASKAppSettingsWebViewController`
+- `IASKViewControllerSelector`: set to `initWithFile:specifier:`
+- `Title`: the localized title of the row
+- `File`: corresponds to the URL you want to load (e.g. "https://www.futuretap.com")
+
+Use the following optional IASKSpecifier properties to customize the Web View Controller:
+
+- `IASKWebViewShowProgress`: set to `YES` to replace the default activity indicator on the Navigation Bar by a progress bar just below the Navigation Bar, which dynamically updates according to the [`estimatedProgress`](https://developer.apple.com/documentation/webkit/wkwebview/1415007-estimatedprogress) property of [`WKWebView`](https://developer.apple.com/documentation/webkit/wkwebview).   
+The progress bar will be removed when page loading completes.
+- `IASKWebViewShowNavigationalButtons`: set to `YES` to show navigational buttons on the right side of the Navigation Bar. Their enable state will update dynamically based on the navigation history of the [`WKWebView`](https://developer.apple.com/documentation/webkit/wkwebview).
+- `IASKWebViewHideBottomBar`: set to `YES` to hide the toolbar at the bottom of the screen when the `IASKAppSettingsWebViewController` is pushed on to a navigation controller. This will present the [`WKWebView`](https://developer.apple.com/documentation/webkit/wkwebview) full screen and prevents situations where the user can navigate the tab bar while the `IASKAppSettingsWebViewController` stays still present.  
+This setting is ignored when the `IASKAppSettingsWebViewController` is presented modally.
+
+For more details, open the [Sample application](#sample-application) and take a look at all rows that start with **WebView**.
+
+Although `IASKAppSettingsWebViewController` might look similar to [`SFSafariViewController`](https://developer.apple.com/documentation/safariservices/sfsafariviewcontroller), the big difference is that `IASKAppSettingsWebViewController` does not reveal the URL to the user, nor can it be opened in an external browser (i.e. Safari or Chrome).  
+In other words, it keeps your source private.
+
+
 ## Mail Composer
 The custom `IASKMailComposeSpecifier` element allows to send mail from within the app by opening a mail compose view. You can set the following (optional) parameters using the settings plist: `IASKMailComposeToRecipents`, `IASKMailComposeCcRecipents`, `IASKMailComposeBccRecipents`, `IASKMailComposeSubject`, `IASKMailComposeBody`, `IASKMailComposeBodyIsHTML`. Optionally, you can implement