在《iOS WebCore的wak目录》中证实了iOS的WebKit是想尽可能复用Mac上的代码，所以WebView在iOS和Mac上差不多。
Mac WebView的参考文档：
当然，官方文档不会描述WebView在iOS上的作用，因为用class-dump导出头文件的关系，所以有些成为了私有API的函数还是值得说说，例如设置UA。
+ (BOOL)canShowMIMEType:(NSString *)MIMEType能否显示某种MIMEType的数据。iOS可以做截获判断。
+ (void)_setTileCacheLayerPoolCapacity:(unsigned int)arg1;设置块区绘制的layer缓存数量。关于TileCache暂可参考《 UIWebView结构体系（二）UIWebTiledView和WAKWindow》，把这个数值设大可在一定程度加速页面渲染，但也会因此占用更多内存。
+ (void)_setHTTPPipeliningEnabled:(BOOL)arg1;开关 HTTP管线化
+ (void)_removeUserStyleSheetsFromGroup:(id)arg1 world:(id)arg2; + (void)_removeUserScriptsFromGroup:(id)arg1 world:(id)arg2; + (void)_removeUserStyleSheetFromGroup:(id)arg1 world:(id)arg2 url:(id)arg3; + (void)_removeUserScriptFromGroup:(id)arg1 world:(id)arg2 url:(id)arg3; + (void)_addUserStyleSheetToGroup:(id)arg1 world:(id)arg2 source:(id)arg3 url:(id)arg4 whitelist:(id)arg5 blacklist:(id)arg6 injectedFrames:(int)arg7; + (void)_addUserStyleSheetToGroup:(id)arg1 world:(id)arg2 source:(id)arg3 url:(id)arg4 whitelist:(id)arg5 blacklist:(id)arg6; + (void)_addUserScriptToGroup:(id)arg1 world:(id)arg2 source:(id)arg3 url:(id)arg4 whitelist:(id)arg5 blacklist:(id)arg6 injectionTime:(int)arg7 injectedFrames:(int)arg8; + (void)_addUserScriptToGroup:(id)arg1 world:(id)arg2 source:(id)arg3 url:(id)arg4 whitelist:(id)arg5 blacklist:(id)arg6 injectionTime:(int)arg7;没用过，从名字看是为特定的资源添加StyleSheet和Script
+ (void)_setMaximumImageSizeBeforeSubsampling:(unsigned int)arg1;设置图片资源预取样的最大size
+ (BOOL)_canHandleRequest:(NSURLRequest*)arg1; + (BOOL)_canHandleRequest:(NSURLRequest*)arg1 forMainFrame:(BOOL)arg2;能否处理这个Request
+ (void)_disableRemoteInspector; + (void)_enableRemoteInspector;开关远程调试功能
+ (BOOL)_allowCookies; + (void)_setAllowCookies:(BOOL)arg1;
- (void)_setCookieEnabled:(BOOL)arg1; - (BOOL)_cookieEnabled;是否启用Cookies
+ (BOOL)_acceleratedImageDecoding; + (void)_setAcceleratedImageDecoding:(BOOL)arg1;开关加速图片解码
+ (void)_setCacheModel:(unsigned int)arg1;设置Cache
+ (void)_setPDFViewClass:(Class)arg1; + (Class)_getPDFViewClass; + (void)_setPDFRepresentationClass:(Class)arg1; + (Class)_getPDFRepresentationClass;设置显示PDF的类
- (double)estimatedProgress;获取估算的加载进度
- (id)elementAtPoint:(struct CGPoint)arg1; - (id)_elementAtWindowPoint:(struct CGPoint)arg1;获取在指定坐标的元素
- (id)customUserAgent; - (void)setCustomUserAgent:(id)arg1;设置自定义的UA
- (void)_setWebGLEnabled:(BOOL)arg1; - (BOOL)_webGLEnabled;开关WebGL功能
- (void)setUsesPageCache:(BOOL)arg1; - (BOOL)usesPageCache;开关缓存Page
- (id)_touchEventRegions;获取在监听touch事件的区域
- (id)_formDelegateForSelector:(SEL)arg1; - (id)_formDelegateForwarder; - (id)_formDelegate; - (void)_setFormDelegate:(id)arg1;
表单处理的委托。可实现自动填充功能
