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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
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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