Sample of page loaded in web view:
<html>
<body>
<script>
function getWindowInfo() {
return {
width: window.innerWidth || document.body.clientWidth,
height: window.innerHeight || document.body.clientHeight
}
};
</script>
</body>
</html>
In a UIView or UIViewController:
import WebKit
// Enable Javascript in web view
let config = WKWebViewConfiguration()
let prefs = WKPreferences()
prefs.javaScriptEnabled = true
config.preferences = prefs
// Instantiate web view. Use self.view.bounds in a UIViewController.
var webView: WKWebView = WKWebView(frame: self.bounds, configuration: config)
// Load page in web view
let url = "https://example.com/test.html"
let webViewUrl = URL(string: url)!
webView.load(URLRequest(url: webViewUrl))
// Run inline Javascript or call a function on the page loaded in the web view
let script = "getWindowInfo();"
webView.evaluateJavaScript(script, completionHandler: { (result, error) in
// result is the value of the final statement in the injected javascript
// if script is "var x = 1; x++;", result will be 2
// Do some error checking
if (error != nil || result == nil) {
return
}
// If the Javascript function returns an object, cast it into a Dictionary
let dict = result as! [String:AnyObject]
// Print the key-value pairs in the dictionary
for (key, value) in dict {
print("\(key) : \(value)")
}
})