UIWebView体系结构（七）WebView

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：

https://developer.apple.com/library/mac/#documentation/Cocoa/Reference/WebKit/Classes/WebView_Class/Reference/Reference.html#//apple_ref/doc/uid/TP40003822

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。

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1. + (BOOL)canShowMIMEType:(NSString *)MIMEType  

能否显示某种MIMEType的数据。iOS可以做截获判断。

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1. + (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。

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1. + (void)_setHTTPPipeliningEnabled:(BOOL)arg1;  

开关 HTTP管线化

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1. + (void)_removeUserStyleSheetsFromGroup:(id)arg1 world:(id)arg2;  
2. + (void)_removeUserScriptsFromGroup:(id)arg1 world:(id)arg2;  
3. + (void)_removeUserStyleSheetFromGroup:(id)arg1 world:(id)arg2 url:(id)arg3;  
4. + (void)_removeUserScriptFromGroup:(id)arg1 world:(id)arg2 url:(id)arg3;  
5. + (void)_addUserStyleSheetToGroup:(id)arg1 world:(id)arg2 source:(id)arg3 url:(id)arg4 whitelist:(id)arg5 blacklist:(id)arg6 injectedFrames:(int)arg7;  
6. + (void)_addUserStyleSheetToGroup:(id)arg1 world:(id)arg2 source:(id)arg3 url:(id)arg4 whitelist:(id)arg5 blacklist:(id)arg6;  
7. + (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;  
8. + (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

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1. + (void)_setMaximumImageSizeBeforeSubsampling:(unsigned int)arg1;  

设置图片资源预取样的最大size

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1. + (BOOL)_canHandleRequest:(NSURLRequest*)arg1;  
2. + (BOOL)_canHandleRequest:(NSURLRequest*)arg1 forMainFrame:(BOOL)arg2;  

能否处理这个Request

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1. + (void)_disableRemoteInspector;  
2. + (void)_enableRemoteInspector;  

开关远程调试功能

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1. + (BOOL)_allowCookies;  
2. + (void)_setAllowCookies:(BOOL)arg1;  

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1. - (void)_setCookieEnabled:(BOOL)arg1;  
2. - (BOOL)_cookieEnabled;  

是否启用Cookies

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1. + (BOOL)_acceleratedImageDecoding;  
2. + (void)_setAcceleratedImageDecoding:(BOOL)arg1;  

开关加速图片解码

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1. + (void)_setCacheModel:(unsigned int)arg1;  

设置Cache

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1. + (void)_setPDFViewClass:(Class)arg1;  
2. + (Class)_getPDFViewClass;  
3. + (void)_setPDFRepresentationClass:(Class)arg1;  
4. + (Class)_getPDFRepresentationClass;  

设置显示PDF的类

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1. - (double)estimatedProgress;  

获取估算的加载进度

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1. - (id)elementAtPoint:(struct CGPoint)arg1;  
2. - (id)_elementAtWindowPoint:(struct CGPoint)arg1;  

获取在指定坐标的元素

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1. - (id)customUserAgent;  
2. - (void)setCustomUserAgent:(id)arg1;  

设置自定义的UA

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1. - (void)_setWebGLEnabled:(BOOL)arg1;  
2. - (BOOL)_webGLEnabled;  

开关WebGL功能

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1. - (void)setUsesPageCache:(BOOL)arg1;  
2. - (BOOL)usesPageCache;  

开关缓存Page

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1. - (id)_touchEventRegions;  

获取在监听touch事件的区域

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1. - (id)_formDelegateForSelector:(SEL)arg1;  
2. - (id)_formDelegateForwarder;  
3. - (id)_formDelegate;  
4. - (void)_setFormDelegate:(id)arg1;  

表单处理的委托。可实现自动填充功能