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IOS Html富文本渲染方式：DTCoreText、WKWebView、UIWebView的内存占用对比_html/css_WEB-ITnose
IOS Html富文本渲染方式：DTCoreText、WKWebView、UIWebView的内存占用对比_html/css_WEB-ITnose
在app的内容页（详情页）中，富文本的显示一直是经常需要处理的问题，而通常在后端的富文本编辑中，Html应用比较普遍，所以其实需要处理的Html富文本显示的问题，以下这三种方式肯定不是最优的显示Html富文本的方式，只是相对简单的解决方案，对前后端的转换要求少，可以快速集成。
以下对这3种方式进行内存的测试对比，毕竟详情页是相对比较大，而且打开频率高的页面，所以内存占用是必须要考虑的问题。
基本环境：
- Objective-C
- Xcode 6.4
- Deployment Target IOS 8.0
- DTCoreText 版本：1.6.16
说明：
- DTCoreText：第三方富文本显示组件，支持Html转换为 NSAttributedString；
- WKWebView：IOS 的WebKit框架的浏览器组件，从IOS 8.0 开始支持；
- UIWebView：IOS 的UIKit框架的浏览器组件，从IOS 2.0 开始支持；
测试方法：
- 使用3个组件分别显示一个web页面的内容（例如：http://news.dayoo.com/guangzhou/201512/11/139995_45489706.htm）；
- 页面加载完后，清空内容，再次加载内容，重复3次；
- 比较3个组件所占用的内存情况；
内存调试工具：Instruments
测试结果：
DTCoreText
WKWebView
UIWebView
运行期的内存占用： DTCoreText
UIWebView一直被人诟病的内存占用问题依旧没有解决，如果需要打开的Html页面比较复杂（尤其是有不少js的）还是慎用吧，新的WKWebView 确实比UIWebView 在内存管理上做得更好，如果app可以抛弃IOS 7 或以下版本，值得使用，至少在内存占用上已经跟 原生的NSAttributedString 差距没那么大了，在IOS设备内存和性能更高的情况下，差距会更小，而纯Html 页面灵活度会更高。
之前在使用UIWebView的时候，试过各种释放内存的方法，包括设置 NSURLCache，清空NSURLCache 等方法，但实际作用都不大，所以在测试中并没有使用这些方式，只是使用 [_webContent loadHTMLString:nil baseURL:nil]; 进行清空内容；
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