在iOS实际的开发中，使用UIWebView来加载数据使用的场景特别多。很多时候我们会动态的从服务器获取一段HTML的内容，然后App这边动态的处理这段HTML内容用于展示在UIWebView上。使用到的API接口为：
- (void)loadHTMLString:(NSString *)string baseURL:(NSURL *)baseURL;传统的方法
由于HTML内容通常是变化的，所以我们需要动态生成HTML代码。通常我们从服务器端获取到标题、时间、作者和对应的内容，然后我们需要对这些数据处理之后拼接成一段HTML字符串。对于传统的做法是将上面的需要替换的内容填写一些占位符，放到指定的文件中如（content.html）,如下所示：
<!DOCTYPE html><html> <head> <title>key_title</title> </head> <body> <div> <div> <h2 id="key-title">key_title</h2> <div>key_date key_author</div> <hr/> </div> <div>key_content</div> </div> </body></html>
然后在指定的地方使用如下的方式动态生成HTML代码：
- (NSString *)loadHTMLByStringFormat:(NSDictionary *)data{ NSString *templatePath = [[NSBundle mainBundle] pathForResource:@"template" ofType:@"html"]; NSMutableString *html = [[NSMutableString alloc] initWithContentsOfFile:templatePath encoding:NSUTF8StringEncoding error:nil]; [html replaceOccurrencesOfString:@"key_title" withString:data[@"title"] options:NSCaseInsensitiveSearch range:NSMakeRange(0, html.length)]; [html replaceOccurrencesOfString:@"key_author" withString:data[@"author"] options:NSCaseInsensitiveSearch range:NSMakeRange(0, html.length)]; [html replaceOccurrencesOfString:@"key_date" withString:data[@"date"] options:NSCaseInsensitiveSearch range:NSMakeRange(0, html.length)]; [html replaceOccurrencesOfString:@"key_content" withString:data[@"content"] options:NSCaseInsensitiveSearch range:NSMakeRange(0, html.length)]; return html;} 生成界面如下
在实际的使用中发现还是存在不少的问题，比如我们需要对数据进行预先处理的时候需要写大量的
- (NSUInteger)replaceOccurrencesOfString:(NSString *)target withString:(NSString *)replacement options:(NSStringCompareOptions)options range:(NSRange)searchRange;
这样的替换，而且对于一些特殊的字符还需要进行特殊处理等，实在不是太友好，这样就需要一个引擎来专门处理这些事情，本文主要介绍MGTemplateEngine和GRMustache的使用。
MGTemplateEngineMGTemplateEngine是AFNetworking的作者Matt的作品，它是一个比较流行的模板引擎，它的模板语言比较类似于Smarty、FreeMarker和Django。另外它可以支持自定义的Filter（以便实现自定义的渲染逻辑），需要依赖正则表达式的工具类RegexKit。
创建模板
<!DOCTYPE html><html> <head> <title>fs_title</title> </head> <body> <div> <div> <h2 id="fs-title">fs_title</h2> <div>fs_date fs_author</div> <hr/> </div> <div>fs_content</div> </div> </body></html>渲染生成HTML字符串
// 第二种MGTemplateEngine MGTemplateEngine *engine = [MGTemplateEngine templateEngine]; [engine setDelegate:self]; [engine setMatcher:[ICUTemplateMatcher matcherWithTemplateEngine:engine]]; NSString *templatePath = [[NSBundle mainBundle] pathForResource:@"MGTemplateEngineTemplate" ofType:@"html"]; // 第一种赋值方式 [engine setObject:variables[@"title"] forKey:@"title"]; [engine setObject:variables[@"author"] forKey:@"author"]; [engine setObject:variables[@"date"] forKey:@"date"]; [engine setObject:variables[@"content"] forKey:@"content"]; NSString *htmlString = [engine processTemplateInFileAtPath:templatePath withVariables:nil]; // 第二种赋值方式 // Process the template and display the results.// NSString *htmlString = [engine processTemplateInFileAtPath:templatePath withVariables:variables]; NSLog(@"Processed template:\r%@", htmlString); [self.webView loadHTMLString:htmlString baseURL:nil];
说明
（1）MGTemplateEngine提供的示例程序是运行在Mac OS上的，如果要使用到iOS上面需要引入Foundation框架,还需要个UIKit （2）对于运行在Xcode6以上的环境下创建的工程由于没有PCH文件可能会报错，需要在MGTemplateEngine的各个头文件中引入Foundation框架 （3）MGTemplateEngine在GitHub上的地址为https://github.com/mattgemmell/MGTemplateEngine。(4) 如果要算出这个webview的高度 在div加上
NSString *heightString = [webViewstringByEvaluatingJavaScriptFromString:@"document.getElementById(\"container\").offsetHeight;"];
GRMustacheGRMustache使用方法 《GRMustache Document》
举个例子
A typical Mustache template:模板Hello fs_nameYou have just won fs_value dollars!fs_#in_caWell, fs_taxed_value dollars, after taxes.fs_/in_caGiven the following hash:赋值
{ "name": "Chris", "value": 10000, "taxed_value": 10000 - (10000 * 0.4), "in_ca": true} Will produce the following:得出的网页 Hello ChrisYou have just won 10000 dollars!Well, 6000.0 dollars, after taxes.
代码：
NSString *template = [[NSBundle mainBundle] pathForResource:@"MGTemplateEngineTemplate" ofType:@"html"];// 注意要对路径进行UTF8编码 不然会有问题NSString *templatePath = [NSString stringWithContentsOfFile:template encoding:NSUTF8StringEncoding error:nil];NSString *htmlString = [GRMustacheTemplate renderObject:variables fromString:templatePath error:nil];[self.webView loadHTMLString:htmlString baseURL:nil];
Difficulty in updating caching of official account web pages: How to avoid the old cache affecting the user experience after version update?Mar 04, 2025 pm 12:32 PMThe official account web page update cache, this thing is simple and simple, and it is complicated enough to drink a pot of it. You worked hard to update the official account article, but the user still opened the old version. Who can bear the taste? In this article, let’s take a look at the twists and turns behind this and how to solve this problem gracefully. After reading it, you can easily deal with various caching problems, allowing your users to always experience the freshest content. Let’s talk about the basics first. To put it bluntly, in order to improve access speed, the browser or server stores some static resources (such as pictures, CSS, JS) or page content. Next time you access it, you can directly retrieve it from the cache without having to download it again, and it is naturally fast. But this thing is also a double-edged sword. The new version is online,
How to efficiently add stroke effects to PNG images on web pages?Mar 04, 2025 pm 02:39 PMThis article demonstrates efficient PNG border addition to webpages using CSS. It argues that CSS offers superior performance compared to JavaScript or libraries, detailing how to adjust border width, style, and color for subtle or prominent effect
How do I use HTML5 form validation attributes to validate user input?Mar 17, 2025 pm 12:27 PMThe article discusses using HTML5 form validation attributes like required, pattern, min, max, and length limits to validate user input directly in the browser.
What is the purpose of the <datalist> element?Mar 21, 2025 pm 12:33 PMThe article discusses the HTML <datalist> element, which enhances forms by providing autocomplete suggestions, improving user experience and reducing errors.Character count: 159
What is the purpose of the <progress> element?Mar 21, 2025 pm 12:34 PMThe article discusses the HTML <progress> element, its purpose, styling, and differences from the <meter> element. The main focus is on using <progress> for task completion and <meter> for stati
What is the purpose of the <meter> element?Mar 21, 2025 pm 12:35 PMThe article discusses the HTML <meter> element, used for displaying scalar or fractional values within a range, and its common applications in web development. It differentiates <meter> from <progress> and ex
What are the best practices for cross-browser compatibility in HTML5?Mar 17, 2025 pm 12:20 PMArticle discusses best practices for ensuring HTML5 cross-browser compatibility, focusing on feature detection, progressive enhancement, and testing methods.
What is the purpose of the <iframe> tag? What are the security considerations when using it?Mar 20, 2025 pm 06:05 PMThe article discusses the <iframe> tag's purpose in embedding external content into webpages, its common uses, security risks, and alternatives like object tags and APIs.
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
SublimeText3 English version
Recommended: Win version, supports code prompts!
Safe Exam Browser
Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.
Zend Studio 13.0.1
Powerful PHP integrated development environment
DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software
mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),
