我创建了支持 pdf 和 ePub 格式的书籍应用程序。在该应用程序中,pdf 仅显示为图像,并且 ePub 在 webview 中打开,因为 EPUB 只是存储在带有 XML 清单的 zip 文件中的 XHTML。现在,我想更改 ePub 书页的字体样式和字体颜色。可能吗?如果可能的话,那么我该如何实现呢?我搜索了很多,但没有得到任何适当的解决方案。
问问题
2652 次
1 回答
4
我找到了解决方案。我制作了一个字符串并使用 Java 字符串进行评估
这是我写的:
NSString *varMySheet = @"var mySheet = document.styleSheets[0];";
NSString *addCSSRule = @"function addCSSRule(selector, newRule) {"
"if (mySheet.addRule) {"
"mySheet.addRule(selector, newRule);" // For Internet Explorer
"} else {"
"ruleIndex = mySheet.cssRules.length;"
"mySheet.insertRule(selector + '{' + newRule + ';}', ruleIndex);" // For Firefox, Chrome, etc.
"}"
"}";
NSString *insertRule1 = [NSString stringWithFormat:@"addCSSRule('html', 'padding: 0px; height: %fpx; -webkit-column-gap: 0px; -webkit-column-width: %fpx;')", webView.frame.size.height, webView.frame.size.width];
NSString *insertRule2 = [NSString stringWithFormat:@"addCSSRule('p', 'text-align: justify;')"];
NSString *setTextSizeRule = [NSString stringWithFormat:@"addCSSRule('body', '-webkit-text-size-adjust: %d%%;')", currentTextSize];
NSString *setHighlightColorRule = [NSString stringWithFormat:@"addCSSRule('highlight', 'background-color: yellow;')"];
// this is what change the text style
NSString *insertRule3 = [NSString stringWithFormat:@"addCSSRule('html, body, div, p, span, a', 'font-family: arial;')"];
NSString *changeColor = [NSString stringWithFormat:@"addCSSRule('html, body, div, p, span, a', 'color: #1122CC;')"];
[webView stringByEvaluatingJavaScriptFromString:varMySheet];
[webView stringByEvaluatingJavaScriptFromString:addCSSRule];
[webView stringByEvaluatingJavaScriptFromString:insertRule1];
[webView stringByEvaluatingJavaScriptFromString:insertRule2];
[webView stringByEvaluatingJavaScriptFromString:setTextSizeRule];
[webView stringByEvaluatingJavaScriptFromString:setHighlightColorRule];
[webView stringByEvaluatingJavaScriptFromString:insertRule3];
[webView stringByEvaluatingJavaScriptFromString:changeColor];
于 2012-05-30T10:35:57.200 回答