NEW: Master Swift design patterns with my latest book! >>

How to run JavaScript on a UIWebView with stringByEvaluatingJavaScript(from:)

Written by Paul Hudson    @twostraws

You can run custom JavaScript on a UIWebView using the method stringByEvaluatingJavaScript(from:). The method returns an optional string, which means if the code returns a value you'll get it back otherwise you'll get back nil.

Here's an example that pulls out the current page's title:

let pageTitle = yourWebView.stringByEvaluatingJavaScript(from: "document.title")

Note: if you're using a WKWebView you can use its title property directly to get the same thing.

Available from iOS 2.0

Did this solution work for you? Please pass it on!

Other people are reading…

About the Swift Knowledge Base

This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.

Want to build macOS apps?

Hacking with macOS delivers 18 awesome projects that teach you macOS development in no time – take control of your desktop today!

Click here to visit the Hacking with Swift store >>