UIWebView vs WKWebView

1. UIWebView? WKWebView?

* According to iOS version, AppleWebKit version change...

iOS 7.1 : 537.51.2

iOS 8.1 : 600.1.4 (WKWebView Class added)

- UIWebView Class exist in UIKit Framework

	UIWebView	WKWebView
Framework	UIKit	WebKit
Support Storyboard	Yes	No

- Add Object library in Storyboard

- Coding

* case (UIWebView)

* case (WKWebView)

- Delegate API differences are...

UIWebView	WKWebView
didFailLoadWithError	didFailNavigation
webViewDidFinishLoad	didFinishNavigation
webViewDidStartLoad	didStartProvisionalNavigation
shuldStartLoadWithRequest	decidePolicyForNavigationAction

2. Benchmark Comparison analysis

* test rendering application : https://itunes.apple.com/app/id928647773?mt=8

	UIWebView (iOS 7.1, iPad 2)	UIWebView (iOS 8.1, iPad Air)	WKWebView (iOS 8.1, iPad Air)
HTML5 (http://html5test.com/)	410/555	427/555 WebGL 3D support	440/555 WebGL 3D / IndexedDB  support
CSS3 (http://css3test.com/)	56% 644/1347	61% 722/1347	61% 722/1347
JavaScript (SunSpider)	4139.8ms	3509.8ms	405.2ms
ECMAScript Compatibility (Link)	2%	28%	28%
WebGL 2D (CPU uses about 850 particles)	98%	94%	18%
WebGL 3D (frame rate for 100 fish)	NOT support	Crashed	13frame

3. Issues

- file:// don't work without tmp directory

- Can't handle in Storyboard and Interface Builder

- HTML a tag with target="_blank" won't respond

- URL Scheme and App Store link won't work

- NSCachedURLResponse won't work

- NSHTTPCookieStorage wont't work

- Can't coexist with UIWebView on iOS 7 and below