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

- (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.youkuaiyun.com/download/donny_zhang/5647857