以两页模式呈现ePub

Question

我正在使用AePubreader示例代码来读取我的应用程序中的ePub。我面临的问题是，章节的最后一页没有正确呈现，它们偏离了可见区域。我用以下方式编辑了AePubreader代码，以便在ipad上转换为两页模式。

-在chapper.m文件中，webViewDiDFinishLoading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-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，是否有任何可供选择的库提供两页模式支持，以准确呈现epub？

Answer 1

当webview的滚动视图不在页面宽度的倍数时，我通过提供列号和托管内容大小来改变逻辑。感谢您抽出时间

Answer 2

@dineshprasanna在您的项目中进行以下更改。

在章节.m文件中

- (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.
    "}"
    "}";
//  NSLog(@"w:%f h:%f", webView.bounds.size.width, webView.bounds.size.height);

   NSString *insertRule1 = [NSString stringWithFormat:@"addCSSRule('html', 'padding-left: 50px;padding-right: 50px; padding-top: 50px; padding-bottom: 50px; -webkit-column-gap: 100px;height: %fpx; -webkit-column-width : %fpx')", webView.frame.size.height-100,webView.frame.size.width/2-200];    
    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:auto;')", webView.frame.size.width *0.75];
    NSString *setImageRule = [NSString stringWithFormat:@"addCSSRule('img', 'max-width: %fpx; height:%fpx;')", webView.frame.size.width/2-200,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];
    int totalWidth = [[webView stringByEvaluatingJavaScriptFromString:@"document.documentElement.scrollWidth"] floatValue];
    pageCount = (ceilf)((float)totalWidth/webView.frame.size.width);
    if (totalWidth % (int)webView.frame.size.width != 0)
    {
        UIScrollView *scrollV = [self getScrollViewFromWebView:webView];
        scrollV.contentSize = CGSizeMake(pageCount*(webView.frame.size.width), webView.scrollView.contentSize.height);
    }

    NSLog(@"Chapter %d: %@ -> %d pages & totalWidth :: %d", chapterIndex, title, pageCount,totalWidth);
    [activityIndicator removeFromSuperview];
    [activityIndicator stopAnimating];
    [webView dealloc];

    [delegate chapterDidFinishLoad:self];
}

在您的epubviewcontroller文件中：-

- (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: 25px; padding-top: 100px; padding-right: 25px; height: %fpx; -webkit-column-gap: 50px; -webkit-column-width:%fpx;')", webView.frame.size.height-200, (webView.frame.size.width/2-100) ];
    NSString *insertRule1 = [NSString stringWithFormat:@"addCSSRule('html', 'padding-left: 50px;padding-right: 50px; padding-top: 50px; padding-bottom: 50px; -webkit-column-gap: 100px;height: %fpx; -webkit-column-width : %fpx')", webView.frame.size.height-100,webView.frame.size.width/2-200];     

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

    float pageCountofChapter = [[loadedEpub.spineArray objectAtIndex:currentSpineIndex] pageCount];
    pagesInCurrentSpineCount =pageCountofChapter;
    int totalWidth = [[webView stringByEvaluatingJavaScriptFromString:@"document.documentElement.scrollWidth"] floatValue];
    if (totalWidth % (int)webView.frame.size.width != 0)
    {
        UIScrollView *scrollV = [self getScrollViewFromWebView:webView];
        scrollV.contentSize = CGSizeMake(pagesInCurrentSpineCount*(webView.frame.size.width), webView.scrollView.contentSize.height);
    }
    [self gotoPageInCurrentSpine:currentPageInSpineIndex];
}

希望这对你有帮助。根据您的要求安排填充和边距。