ios epub电子书阅读器demo

demo功能：读取epub电子书的阅读器demo，可以更改字体大小，查询，按电子书章节索引。

demo说明：按照epub结构读取内容并显示。主要使用webview显示内容，章节内用js制作的翻页效果（效果不是很好，有点闪烁）。主要代码在：EPubViewController.m中。

demo截屏：



demo的主要代码：翻页控制部分

[csharp]
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- (void) chapterDidFinishLoad:(Chapter *)chapter{  
    totalPagesCount+=chapter.pageCount;  
  
    if(chapter.chapterIndex + 1 < [loadedEpub.spineArray count]){  
        [[loadedEpub.spineArray objectAtIndex:chapter.chapterIndex+1] setDelegate:self];  
        [[loadedEpub.spineArray objectAtIndex:chapter.chapterIndex+1] loadChapterWithWindowSize:webView.bounds fontPercentSize:currentTextSize];  
        [currentPageLabel setText:[NSString stringWithFormat:@"?/%d", totalPagesCount]];  
    } else {  
        [currentPageLabel setText:[NSString stringWithFormat:@"%d/%d",[self getGlobalPageCount], totalPagesCount]];  
        [pageSlider setValue:(float)100*(float)[self getGlobalPageCount]/(float)totalPagesCount animated:YES];  
        paginating = NO;  
        NSLog(@"Pagination Ended!");  
    }  
}  
  
- (int) getGlobalPageCount{  
    int pageCount = 0;  
    for(int i=0; i<currentSpineIndex; i++){  
        pageCount+= [[loadedEpub.spineArray objectAtIndex:i] pageCount];   
    }  
    pageCount+=currentPageInSpineIndex+1;  
    return pageCount;  
}  
  
- (void) loadSpine:(int)spineIndex atPageIndex:(int)pageIndex {  
    [self loadSpine:spineIndex atPageIndex:pageIndex highlightSearchResult:nil];  
}  
  
- (void) loadSpine:(int)spineIndex atPageIndex:(int)pageIndex highlightSearchResult:(SearchResult*)theResult{  
      
    webView.hidden = YES;  
      
    self.currentSearchResult = theResult;  
  
    [chaptersPopover dismissPopoverAnimated:YES];  
    [searchResultsPopover dismissPopoverAnimated:YES];  
      
    NSURL* url = [NSURL fileURLWithPath:[[loadedEpub.spineArray objectAtIndex:spineIndex] spinePath]];  
    [webView loadRequest:[NSURLRequest requestWithURL:url]];  
    currentPageInSpineIndex = pageIndex;  
    currentSpineIndex = spineIndex;  
    if(!paginating){  
        [currentPageLabel setText:[NSString stringWithFormat:@"%d/%d",[self getGlobalPageCount], totalPagesCount]];  
        [pageSlider setValue:(float)100*(float)[self getGlobalPageCount]/(float)totalPagesCount animated:YES];    
    }  
}  
  
- (void) gotoPageInCurrentSpine:(int)pageIndex{  
    if(pageIndex>=pagesInCurrentSpineCount){  
        pageIndex = pagesInCurrentSpineCount - 1;  
        currentPageInSpineIndex = pagesInCurrentSpineCount - 1;   
    }  
      
    float pageOffset = pageIndex*webView.bounds.size.width;  
  
//注入js 滚动到指定的坐标--js翻页效果  
    NSString* goToOffsetFunc = [NSString stringWithFormat:@" function pageScroll(xOffset){ window.scroll(xOffset,0); } "];  
    NSString* goTo =[NSString stringWithFormat:@"pageScroll(%f)", pageOffset];  
      
    [webView stringByEvaluatingJavaScriptFromString:goToOffsetFunc];  
    [webView stringByEvaluatingJavaScriptFromString:goTo];  
      
    if(!paginating){  
        [currentPageLabel setText:[NSString stringWithFormat:@"%d/%d",[self getGlobalPageCount], totalPagesCount]];  
        [pageSlider setValue:(float)100*(float)[self getGlobalPageCount]/(float)totalPagesCount animated:YES];    
    }  
      
    webView.hidden = NO;  
      
}  
  
- (void) gotoNextSpine {  
    if(!paginating){  
        if(currentSpineIndex+1<[loadedEpub.spineArray count]){  
            [self loadSpine:++currentSpineIndex atPageIndex:0];  
        }     
    }  
}  
  
- (void) gotoPrevSpine {  
    if(!paginating){  
        if(currentSpineIndex-1>=0){  
            [self loadSpine:--currentSpineIndex atPageIndex:0];  
        }     
    }  
}  
  
- (void) gotoNextPage {  
    if(!paginating){  
        if(currentPageInSpineIndex+1<pagesInCurrentSpineCount){  
            [self gotoPageInCurrentSpine:++currentPageInSpineIndex];  
        } else {  
            [self gotoNextSpine];  
        }         
    }  
}  
  
- (void) gotoPrevPage {  
    if (!paginating) {  
        if(currentPageInSpineIndex-1>=0){  
            [self gotoPageInCurrentSpine:--currentPageInSpineIndex];  
        } else {  
            if(currentSpineIndex!=0){  
                int targetPage = [[loadedEpub.spineArray objectAtIndex:(currentSpineIndex-1)] pageCount];  
                [self loadSpine:--currentSpineIndex atPageIndex:targetPage-1];  
            }  
        }  
    }  
}  
  
  
- (IBAction) increaseTextSizeClicked:(id)sender{  
    if(!paginating){  
        if(currentTextSize+25<=200){  
            currentTextSize+=25;  
            [self updatePagination];  
            if(currentTextSize == 200){  
                [incTextSizeButton setEnabled:NO];  
            }  
            [decTextSizeButton setEnabled:YES];  
        }  
    }  
}  
- (IBAction) decreaseTextSizeClicked:(id)sender{  
    if(!paginating){  
        if(currentTextSize-25>=50){  
            currentTextSize-=25;  
            [self updatePagination];  
            if(currentTextSize==50){  
                [decTextSizeButton setEnabled:NO];  
            }  
            [incTextSizeButton setEnabled:YES];  
        }  
    }  
}  
  
- (IBAction) doneClicked:(id)sender{  
    [self dismissModalViewControllerAnimated:YES];  
}  
  
  
- (IBAction) slidingStarted:(id)sender{  
    int targetPage = ((pageSlider.value/(float)100)*(float)totalPagesCount);  
    if (targetPage==0) {  
        targetPage++;  
    }  
    [currentPageLabel setText:[NSString stringWithFormat:@"%d/%d", targetPage, totalPagesCount]];  
}  
  
- (IBAction) slidingEnded:(id)sender{  
    int targetPage = (int)((pageSlider.value/(float)100)*(float)totalPagesCount);  
    if (targetPage==0) {  
        targetPage++;  
    }  
    int pageSum = 0;  
    int chapterIndex = 0;  
    int pageIndex = 0;  
    for(chapterIndex=0; chapterIndex<[loadedEpub.spineArray count]; chapterIndex++){  
        pageSum+=[[loadedEpub.spineArray objectAtIndex:chapterIndex] pageCount];  
//      NSLog(@"Chapter %d, targetPage: %d, pageSum: %d, pageIndex: %d", chapterIndex, targetPage, pageSum, (pageSum-targetPage));  
        if(pageSum>=targetPage){  
            pageIndex = [[loadedEpub.spineArray objectAtIndex:chapterIndex] pageCount] - 1 - pageSum + targetPage;  
            break;  
        }  
    }  
    [self loadSpine:chapterIndex atPageIndex:pageIndex];  
}  
  
- (IBAction) showChapterIndex:(id)sender{  
    if(chaptersPopover==nil){  
        ChapterListViewController* chapterListView = [[ChapterListViewController alloc] initWithNibName:@"ChapterListViewController" bundle:[NSBundle mainBundle]];  
        [chapterListView setEpubViewController:self];  
        chaptersPopover = [[UIPopoverController alloc] initWithContentViewController:chapterListView];  
        [chaptersPopover setPopoverContentSize:CGSizeMake(400, 600)];  
        [chapterListView release];  
    }  
    if ([chaptersPopover isPopoverVisible]) {  
        [chaptersPopover dismissPopoverAnimated:YES];  
    }else{  
        [chaptersPopover presentPopoverFromBarButtonItem:chapterListButton permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];         
    }  
}  
  
  
//webview 完成加载，将css注入。webview加载一次是一个epub里的xhtml内容，可能是一页，也可能是多页。  
//可以看看demo中的.epub文件。将.epub改成zip 解压就可以看到epub的内容  
- (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: 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;')"];  
  
      
    [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];  
    pagesInCurrentSpineCount = (int)((float)totalWidth/webView.bounds.size.width);  
      
    [self gotoPageInCurrentSpine:currentPageInSpineIndex];  
}  
  
- (void) updatePagination{  
    if(epubLoaded){  
        if(!paginating){  
            NSLog(@"Pagination Started!");  
            paginating = YES;  
            totalPagesCount=0;  
            [self loadSpine:currentSpineIndex atPageIndex:currentPageInSpineIndex];  
            [[loadedEpub.spineArray objectAtIndex:0] setDelegate:self];  
            [[loadedEpub.spineArray objectAtIndex:0] loadChapterWithWindowSize:webView.bounds fontPercentSize:currentTextSize];  
            [currentPageLabel setText:@"?/?"];  
        }  
    }  
}  

demo下载地址：http://download.csdn.net/download/donny_zhang/5647857