Ios webkit
To do this, there are a few steps on the iOS side:
#Ios webkit code#
While user scripts may let you inject JavaScript code into your webpage, script messages let you call native code from JavaScript. It can also communicate back to your app using script messages using the WKScriptMessageHandler protocol. What else can you write a user script to do? Well, it can do anything a normal script on the webpage can do–modify document structure, listen to events like onload, load external resources (e.g., images, XMLHTTP requests). This is a brief overview of what it’s like to add a basic user script to a web view at init time. To do this, add your JavaScript file to Xcode, get the path to the file, and initialize a string with the contents of the file: forMainFrameOnly: Specify whether your script runs in all frames or just in the main frame.įor your source, you can simply pass in a string or, if the script is more complex, load it from a local file in Xcode.This corresponds with when the DOMContentLoaded event is fired. If you pass in WKUserInjectionTime.atDocumentEnd, then your script will run after the document is finished parsing but before any subresources (e.g., images) have loaded. If you pass in WKUserInjectionTime.atDocumentStart, your script will run right after the document element has been created but before any of the document has been parsed. injectionTime: Specify whether the JavaScript loads at document start or at document end.source: Pass in a string representation of your JavaScript as your source.The init method takes in three parameters: It’s super easy to create too! Let’s start with a simple example of what a WKWebView looks like out of the box.Īll you need to do to get started is create a WKWebView object, add constraints, and pass in a URLRequest to load a webpage:Ĭreating a User Script to Change Background Color It also includes the same built-in gestures for zooming and navigating backwards and forwards as the ones in Safari. Apple developers ripped out the old JavaScript engine and replaced it with Nitro–the same engine that underlies Safari. It utilizes Core Animation and hardware acceleration so that webpages could scroll at 60fps. WKWebViewįirst announced at WWDC 2014, WKWebView was a game-changer for rendering web content in iOS apps.
#Ios webkit how to#
In this post, I’ll show you examples of how to inject scripts into your webpages and receive data to do things like change the background of the webpage or call native functions directly from JavaScript.
![ios webkit ios webkit](https://static.techspot.com/images2/news/bigimage/2021/03/2021-03-09-image-4.jpg)
It also drastically improved communication with JavaScript natively. The new framework dramatically improved both the performance and flexibility of adding web content into iOS apps, giving developers more control and more power. After iOS 8, however, Apple deprecated UIWebView for WKWebView and introduced the modern WebKit API. Prior to iOS 8, we’d have to use a UIWebView which was clunky, leaked memory, and difficult to debug.
![ios webkit ios webkit](https://docs.nativescript.org/angular/img/ns-common.png)
We may want to load content from a website that pairs with a native app version, or we may want to let the user open links without having to open another browser. As iOS developers, there are times we want to include web content inside our iOS apps.