COCOA SAVE UIWEBVIEW AS PDF

And it goes back to the very inception of the platform over a decade ago. Although the design of the first iPhone seems like a foregone conclusion today, the iconic touchscreen device we know and love today was just one option on the table at the time. Even the iPod click wheel was a serious contender for a time. But perhaps the most significant early decision to be made involved software, not hardware. How should the iPhone run software?

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And it goes back to the very inception of the platform over a decade ago. Although the design of the first iPhone seems like a foregone conclusion today, the iconic touchscreen device we know and love today was just one option on the table at the time. Even the iPod click wheel was a serious contender for a time.

But perhaps the most significant early decision to be made involved software, not hardware. How should the iPhone run software? Apps, like on macOS? Or as web pages, using Safari?

That choice to fork macOS and build iPhoneOS had widespread implications and remains a contentious decision to this day. The full Safari engine is inside of iPhone. And so, you can write amazing Web 2. And these apps can integrate perfectly with iPhone services. They can make a call, they can send an email, they can look up a location on Google Maps. The web had long been a second-class citizen on iOS, which is ironic since the iPhone is largely responsible for the mobile web as it exists today.

UIWeb View was massive and clunky and leaked memory like a sieve. It lagged behind Mobile Safari, unable to take advantage of its faster JavaScript and rendering engines. Boasting responsive 60fps scrolling, built-in gestures, streamlined communication between app and webpage, and the same JavaScript engine as Safari, WKWeb View was one of the most significant announcements at WWDC One of the major improvements over UIWeb View is how interaction and data can be passed back and forth between an app and its web content.

This powerful feature allows for web content to be manipulated in a safe and consistent way across page requests. When you create a WKUser Script object, you provide JavaScript code to execute, specify whether it should be injected at the start or end of loading the document, and whether the behavior should be used for all frames or just the main frame.

Communication from web to app has improved significantly as well, with the introduction of message handlers. Like how console.

Now, when a notification comes into the app such as to notify the creation of a new object on the page that information can be passed with:. Add User Scripts to create hooks for webpage events that use Message Handlers to communicate status back to the app. The same approach can be used to scrape information from the page for display or analysis within the app. For example, if you wanted to build a browser specifically for NSHipster.

Though depending on your use case, you may be able to skip the hassle of round-trip communication with JavaScript. Pass these rules to compile Content Rule List for Identifier:encoded Content Rule List:completion Handler: and configure a web view with the resulting content rule list in the completion handler:.

By declaring rules declaratively, WebKit can compile these operations into bytecode that can run much more efficiently than if you injected JavaScript to do the same thing.

In addition to hiding page elements, you can use content blocking rules to prevent page resources from loading like images or scripts , strip cookies from requests to the server, and force a page to load securely over HTTPS.

Previously, taking screenshots of a web page meant messing around with view layers and graphics contexts. So a clean, single method option is a welcome addition to the API. WKWeb View truly makes the web feel like a first-class citizen. Even if you consider yourself native purist, you may be surprised at the power and flexibility afforded by WebKit.

In fact, many of the apps you use every day rely on WebKit to render especially tricky content. Message Handlers Communication from web to app has improved significantly as well, with the introduction of message handlers.

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How to load a HTML string into a WKWebView or UIWebView: loadHTMLString()

WKWebView is a powerhouse on iOS, providing high-performance web rendering wherever and whenever you need. So, if you want to solve a specific problem, or if you just want to see what WebKit is capable of, read on! All data is attached automatically, and it only takes a line of code to setup. Start your free trial now and get 3 months off exclusively for the Hacking with Swift Community. Start your free trial! Sponsor Hacking with Swift and reach the world's largest Swift community!

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Use the stop Loading method to stop loading, and the is Loading property to find out if a web view is in the process of loading. If you allow the user to move back and forward through the webpage history, then you can use the go Back and go Forward methods as actions for buttons. By default, a web view automatically converts telephone numbers that appear in web content to Phone links. When a Phone link is tapped, the Phone app launches and dials the number.

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