UIWebView class has been around since iOS 2.0 as a way to show HTML content inside your app, but iOS 8.0 introduced
WKWebView as an alternative - what's the difference?
Well, there are several differences, but two are particularly important. First,
UIWebView is part of UIKit, and thus is available to your apps as standard. You don't need to import anything – it's just there. This also means it's available inside Interface Builder, so you can drag and drop web view into your designs.
WKWebView loads web pages faster and more efficiently than
UIWebView, and also doesn't have as much memory overhead for you.
In iOS 8.0
WKWebView was unable to load local files, but this got fixed in iOS 9.0. The main reason to use
UIWebView nowadays is for access to older features such as "Scale pages to fit" - this is not available in
Available from iOS 8.0 – see Hacking with Swift tutorial 4
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