ipad - 以两页模式呈现 ePub

Question

我正在使用 AePubreader 示例代码在我的应用程序中阅读 ePub。我面临的问题是章节的最后一页没有正确呈现并且它们超出了可见区域。我按照以下方式编辑了 AePubreader 代码，以便在 iPad 中以两页模式进行转换。

-在 chaper.m 文件中，webViewDiDFinishLoading 具有以下代码:

- (void) webViewDidFinishLoad:(UIWebView*)webView{
    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-left: 0px;padding-right: 0px; padding-top: 0px; padding-bottom: 0px; height: %fpx;-webkit-column-count: 2; -webkit-column-gap: 0px; ')", webView.frame.size.height];    

    NSString *insertRule2 = [NSString stringWithFormat:@"addCSSRule('p', 'text-align: justify;')"];
    NSString *setTextSizeRule = [NSString stringWithFormat:@"addCSSRule('body', '-webkit-text-size-adjust: %d%%;')",fontPercentSize];

    NSString *setImageRule = [NSString stringWithFormat:@"addCSSRule('img', 'max-width: %fpx; height:%fpx;')", webView.frame.size.width-200,webView.frame.size.height-200];


    NSString *setFontRule = [NSString stringWithFormat:@"addCSSRule('body', 'font-family: Arial;' , 'font-name: Arial-BoldItalicMT;')"];

    [webView stringByEvaluatingJavaScriptFromString:setFontRule];
    [webView stringByEvaluatingJavaScriptFromString:setImageRule];

    [webView stringByEvaluatingJavaScriptFromString:varMySheet];

    [webView stringByEvaluatingJavaScriptFromString:addCSSRule];

    [webView stringByEvaluatingJavaScriptFromString:insertRule1];

    [webView stringByEvaluatingJavaScriptFromString:insertRule2];

    [webView stringByEvaluatingJavaScriptFromString:setTextSizeRule];

    float totalWidth = [[webView stringByEvaluatingJavaScriptFromString:@"document.body.scrollWidth"] floatValue];
    pageCount = (ceilf)((float)totalWidth/webView.frame.size.width);

    NSLog(@"Chapter %d: %@ -> %d pages & totalWidth :: %f", chapterIndex, title, pageCount,totalWidth);

    [webView dealloc];
    [delegate chapterDidFinishLoad:self];

}

在EpubViewController.m中webViewDidFinishLoading如下:-

- (void)webViewDidFinishLoad:(UIWebView *)theWebView{

    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-left: 0px;padding-right: 0px; padding-top: 0px; padding-bottom: 0px; height: %fpx;-webkit-column-count: 2; -webkit-column-gap: 0px; ')", webView.frame.size.height];    


    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;')"];

    NSString *setImageRule = [NSString stringWithFormat:@"addCSSRule('img', 'max-width: %fpx; height:%fpx;')", (webView.frame.size.width/2)-200,webView.frame.size.height-150];

    NSString *setFontRule = [NSString stringWithFormat:@"addCSSRule('body', 'font-family: Arial;' , 'font-name: Arial-BoldItalicMT;')"];

    [webView stringByEvaluatingJavaScriptFromString:setFontRule];

    [webView stringByEvaluatingJavaScriptFromString:setImageRule];

    [webView stringByEvaluatingJavaScriptFromString:varMySheet];

    [webView stringByEvaluatingJavaScriptFromString:addCSSRule];

    [webView stringByEvaluatingJavaScriptFromString:insertRule1];

    [webView stringByEvaluatingJavaScriptFromString:insertRule2];

    [webView stringByEvaluatingJavaScriptFromString:setTextSizeRule];

    [webView stringByEvaluatingJavaScriptFromString:setHighlightColorRule];

    if(currentSearchResult!=nil){
    //  NSLog(@"Highlighting %@", currentSearchResult.originatingQuery);
        [webView highlightAllOccurencesOfString:currentSearchResult.originatingQuery];
    }

//  int totalWidth = [[webView stringByEvaluatingJavaScriptFromString:@"document.documentElement.scrollWidth"] intValue];

//    NSLog(@">>>>>>>>>>>>>>>>>>>>>>>total width is %d",totalWidth);
//    CGFloat moduloResult = (float)(totalWidth/((int)webView.bounds.size.width % 2));

  //NSLog(@"moduloresult is %f",moduloResult);

//  pagesInCurrentSpineCount = (round)((float)totalWidth/(webView.frame.size.width));
    float pageCountofChapter = [[loadedEpub.spineArray objectAtIndex:currentSpineIndex] pageCount];
    pagesInCurrentSpineCount =(ceilf)(pageCountofChapter/2.0);

    UIScrollView* sv = nil;
    for (UIView* v in  webView.subviews) {
        if([v isKindOfClass:[UIScrollView class]])
        {
            sv = (UIScrollView*) v;
            sv.contentSize = CGSizeMake(pagesInCurrentSpineCount*1024, sv.contentSize.height);
        }
    }

//    NSLog(@"TotalWidth :: %d && pagesInCurrentSpineCount :: %d  && currentPageInSpineIndex :: %d",totalWidth,pagesInCurrentSpineCount,currentPageInSpineIndex);

    [self gotoPageInCurrentSpine:currentPageInSpineIndex];
}

我注意到当计算的页数为奇数时，章节的最后一页没有正确呈现？此外，是否有任何替代库可以提供两种页面模式支持以准确呈现 epub？

Answer 1

当 webview 的 ScrollView 不是页面宽度的倍数时，我通过提供列号和管理内容大小来更改逻辑。感谢您的宝贵时间