Question

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，ePub在webview中打开，因为EPUB只是存储在带有XML清单的zipfile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，我该如何实现这一目标？我搜索了很多，但没有得到任何适当的解决方案。

Answer 1

我找到了解决方案。我已经创建了一个字符串并使用Java字符串进行评估

这就是我写的：

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];

如何在iOS中更改ePub Book的字体颜色和字体样式？

1 个答案: