通过RTLabel、RCLabel、FTCoreText及webView结合SDWebImage等4种方式实现左滑或下拉中cell中图文混排使用场景方案

1.RTLabel和RCLabel两个在使用方式上差不多，对服务端吐的的数据要求比较高
   json数据最好是定制式
   {"type","img",con:"http://www.xxx.com/123.png", “width":"300", "height":"300"}
   {"type","text",con:"图片名称", “width":"", "height":""}

  类似这种方式去对cell中的每一项进行遍历显,部分代码实例如下:

导入RTLabel

#import "RTLabel.h"

在UITableViewCell中实现如下代码

- (void)layoutSubviews
{
	[super layoutSubviews];
    
	CGSize optimumSize = [self.rtLabel optimumSize];
	CGRect frame = [self.rtLabel frame];
	frame.size.height = (int)optimumSize.height+20; // +5 to fix height issue, this should be automatically fixed in iOS5
    
	[self.rtLabel setFrame:frame];
}

/**
 * 初始化
 */

- (void)setupView{
    
    //没有分隔线
    self.selectionStyle = UITableViewCellSeparatorStyleNone;
    self.backgroundColor = [UIColor clearColor];
    self.contentView.backgroundColor = [UIColor clearColor];
    
    self.rtLabel = [PostTextCell textLabel];
    self.rtLabel.userInteractionEnabled = YES;
    self.rtLabel.delegate = self;
    [self.contentView addSubview:self.rtLabel];    
}

/**
 * 设置内容样式
 */

+ (RTLabel*)textLabel
{
    RTLabel *rtLabel = [[RTLabel alloc] initWithFrame:CGRectMake(10,0,300,100)];
    rtLabel.backgroundColor = [UIColor clearColor];
    rtLabel.lineBreakMode = NSLineBreakByWordWrapping;
    rtLabel.textColor = [[UIColor alloc]initWithRed:50.0f/255.0f green:50.0f/255.0f blue:50.0f/255.0f alpha:1.0f];
    rtLabel.font = [UIFont systemFontOfSize:16];
    rtLabel.linkAttributes = [NSDictionary dictionaryWithObject:@"#4595CB"  forKey:@"color"];
    rtLabel.selectedLinkAttributes = [NSDictionary dictionaryWithObject:@"#4595CB" forKey:@"color"]; //BEBEBE
    //rtLabel.selectedLinkAttributes = [NSDictionary dictionaryWithObject:@"#darkGray" forKey:@"color"];
    rtLabel.textAlignment = NSTextAlignmentLeft;
	[rtLabel setParagraphReplacement:@""];
    
	return rtLabel;
}

/**
 * 获取内容高度
 */
+ (float)getHeightWithData:(NSString *)aData{
    RTLabel *rtLabel = [PostTextCell textLabel];
    [rtLabel setText:[NSString stringWithFormat:@"%@",aData]];
    CGSize optimumSize = [rtLabel optimumSize];
    return optimumSize.height+10;
}

另一种RCLabel的实现方式和RTLabel方法基本一样，当遇到图片时

最好单起图片的cell用SDWebImage显示即可，代码如下:

#import "ImgCell.h"

/**
 * 图片cell视图初始化
 */
- (void)setupView{
    
    //没有选择效果
    self.selectionStyle = UITableViewCellSeparatorStyleNone;
    self.backgroundColor = [UIColor clearColor];
    self.contentView.backgroundColor = [UIColor clearColor];
    
    //图片展示
    _imgView = [[JzbNetImageView alloc] initWithFrame:CGRectMake(10, IMGVIWE_TOP, IMGVIEW_WIDTH, IMGVIEW_HEIGHT)];
    [self.contentView addSubview:_imgView];
    _imgView.userInteractionEnabled = YES;
    
    //加点击处理
    _tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapInImgView:)];
    [_imgView addGestureRecognizer:_tapGesture];
}

/**
 * 下载图片并按比例缩放
 */

- (NSString *)updateImgCellWithItem:(Item *)aItem pushViewController:(id)viewController
{
    
    _postItem = aItem;
    _pushViewController = viewController;
    
    NSString *imgURL;
    
    
    //图片展示(图片宽高进行处理)
    if (aItem.width>0 && aItem.height>0) {
            
        /** 获取图片等比例缩放值 **/
        CGSize size = [self scaleSize:aItem.width aHeight:aItem.height];
            
        _imgView.frame = CGRectMake((FD_SCREEN_MAIN_WIDTH-size.width)/2, IMGVIWE_TOP, size.width, size.height);
        imgURL = [NSObject JzbGetAttachImgAttachID:aItem.atthID postID:aItem.threadID width:size.width height:size.height];
    }else{
            
       _imgView.frame = CGRectMake(10, IMGVIWE_TOP, IMGVIEW_WIDTH, IMGVIEW_HEIGHT);
       imgURL = [NSObject JzbGetAttachImgAttachID:aItem.atthID postID:aItem.threadID width:300 height:0];
    }
  
    SDWebImageManager *manager = [SDWebImageManager sharedManager];
    [manager downloadImageWithURL:[NSURL URLWithString:imgURL]
                                  options:SDWebImageRefreshCached
                                 progress:nil
                                completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL *imageURL) {
                                    
                                    if (finished && [error code]>=0) {
                                        _imgView.image = image;
                                        _errorCode = NO;
                                        _imgView.userInteractionEnabled = YES;
                                    }else{
                                        _imgView.image = [UIImage imageNamed:@"bg_img_loading.png"];
                                        _errorCode = YES;
                                        _imgView.userInteractionEnabled = NO;
                                    }
                                }];

    return imgURL;
}

/**
 * 图片等比例缩放
 */
- (CGSize)scaleSize:(NSInteger)aWidth aHeight:(NSInteger)aHeight
{
    int h = aHeight;
    int w = aWidth;
    CGSize _size;
    if(h <= (FD_SCREEN_MAIN_HEIGHT-20) && w <= (FD_SCREEN_MAIN_WIDTH-20)){
        _size = CGSizeMake(w, h);
    }else{
    
        float b = (float)(FD_SCREEN_MAIN_WIDTH-20)/w < (float)(FD_SCREEN_MAIN_HEIGHT-20)/h? (float)(FD_SCREEN_MAIN_WIDTH-20)/w : (float)(FD_SCREEN_MAIN_HEIGHT-20)/h;
        _size = CGSizeMake(b*w, b*h);
    }
    
    return _size;
}

/**
 * 大图显示
 */
- (void)tapInImgView:(id)sender{
    
    NSString *imgUrl;
    if ([_postItem.con hasPrefix:@"http"]) {
        imgUrl = _postItem.con;
    }else{
        imgUrl = [NSObject SDGetAttachImgAttachID:_postItem.atthID postID:_postItem.threadID];
    }
    
    if (imgUrl.length > 0 && _errorCode == NO) {
        FullScreenImageView *fullView = [[FullScreenImageView alloc] initWithImage:_imgView.image inFrame:self.window.bounds withThumbnailImageFrame:[_imgView convertRect:_imgView.bounds toView:self.window] andOriginUrl:[NSURL URLWithString:imgUrl]];
        [self.window addSubview:fullView];
        [UIApplication sharedApplication].statusBarHidden = YES;
    }
}

通过以上代码实现可以实现以下效果：

2.FTCoreText相对RTLabel和RCLabel相对新一些，能对复杂的Json格式中数据项进行定制
   像类似下图这样交果就比较灵活，部分代码实例如下

/**
 * 初始化
 */
- (void)viewDidLoad
{
    [super viewDidLoad];
    
    scrollView = [[UIScrollView alloc] initWithFrame:self.view.bounds];
	scrollView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
    coreTextView = [[FTCoreTextView alloc] initWithFrame:CGRectMake(20, 20, 280, 0)];
	coreTextView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
    
    //设置内容
    [coreTextView setText:[self textForView]];
    
    //设置样式
    [coreTextView addStyles:[self coreTextStyle]];
    
    //设置代理
    [coreTextView setDelegate:self];
    
    //设置内容和高度
    [coreTextView fitToSuggestedHeight];

    [scrollView addSubview:coreTextView];
    [scrollView setContentSize:CGSizeMake(CGRectGetWidth(scrollView.bounds), CGRectGetHeight(coreTextView.frame) + 40)];
    
    [self.view addSubview:scrollView];
}

/**
 * 设置html中的内容样式
 */
- (NSArray *)coreTextStyle
{
    NSMutableArray *result = [NSMutableArray array];
    
    FTCoreTextStyle *defaultStyle = [FTCoreTextStyle new];
    defaultStyle.name = FTCoreTextTagDefault;    //thought the default name is already set to FTCoreTextTagDefault
    defaultStyle.font = [UIFont fontWithName:@"TimesNewRomanPSMT" size:16.f];
    defaultStyle.textAlignment = FTCoreTextAlignementJustified;
    [result addObject:defaultStyle];
    
    
    FTCoreTextStyle *titleStyle = [FTCoreTextStyle styleWithName:@"title"]; // using fast method
    titleStyle.font = [UIFont fontWithName:@"TimesNewRomanPSMT" size:40.f];
    titleStyle.paragraphInset = UIEdgeInsetsMake(0, 0, 25, 0);
    titleStyle.textAlignment = FTCoreTextAlignementCenter;
    [result addObject:titleStyle];
    
    FTCoreTextStyle *imageStyle = [FTCoreTextStyle new];
    imageStyle.paragraphInset = UIEdgeInsetsMake(0,0,0,0);
    imageStyle.name = FTCoreTextTagImage;
    imageStyle.textAlignment = FTCoreTextAlignementCenter;
    [result addObject:imageStyle];
    [imageStyle release];
    
    FTCoreTextStyle *firstLetterStyle = [FTCoreTextStyle new];
    firstLetterStyle.name = @"firstLetter";
    firstLetterStyle.font = [UIFont fontWithName:@"TimesNewRomanPS-BoldMT" size:30.f];
    [result addObject:firstLetterStyle];
    [firstLetterStyle release];
    
    FTCoreTextStyle *linkStyle = [defaultStyle copy];
    linkStyle.name = FTCoreTextTagLink;
    linkStyle.color = [UIColor orangeColor];
    [result addObject:linkStyle];
    [linkStyle release];
    
    FTCoreTextStyle *subtitleStyle = [FTCoreTextStyle styleWithName:@"subtitle"];
    subtitleStyle.font = [UIFont fontWithName:@"TimesNewRomanPS-BoldMT" size:25.f];
    subtitleStyle.color = [UIColor brownColor];
    subtitleStyle.paragraphInset = UIEdgeInsetsMake(10, 0, 10, 0);
    [result addObject:subtitleStyle];
    
    FTCoreTextStyle *bulletStyle = [defaultStyle copy];
    bulletStyle.name = FTCoreTextTagBullet;
    bulletStyle.bulletFont = [UIFont fontWithName:@"TimesNewRomanPSMT" size:16.f];
    bulletStyle.bulletColor = [UIColor orangeColor];
    bulletStyle.bulletCharacter = @"❧";
    [result addObject:bulletStyle];
    [bulletStyle release];
    
    FTCoreTextStyle *italicStyle = [defaultStyle copy];
    italicStyle.name = @"italic";
    italicStyle.underlined = YES;
    italicStyle.font = [UIFont fontWithName:@"TimesNewRomanPS-ItalicMT" size:16.f];
    [result addObject:italicStyle];
    [italicStyle release];
    
    FTCoreTextStyle *boldStyle = [defaultStyle copy];
    boldStyle.name = @"bold";
    boldStyle.font = [UIFont fontWithName:@"TimesNewRomanPS-BoldMT" size:16.f];
    [result addObject:boldStyle];
    [boldStyle release];
    
    FTCoreTextStyle *coloredStyle = [defaultStyle copy];
    [coloredStyle setName:@"colored"];
    [coloredStyle setColor:[UIColor redColor]];
    [result addObject:coloredStyle];
    [defaultStyle release];
    
    return  result;
}



/**
 * FTCoreTextViewDelegate
 */
- (void)coreTextView:(FTCoreTextView *)acoreTextView receivedTouchOnData:(NSDictionary *)data {
    
    CGRect frame = CGRectFromString([data objectForKey:FTCoreTextDataFrame]);
    
    if (CGRectEqualToRect(CGRectZero, frame)) return;
    
    frame.origin.x -= 3;
    frame.origin.y -= 1;
    frame.size.width += 6;
    frame.size.height += 6;
    UIView *view = [[UIView alloc] initWithFrame:frame];
    [view.layer setCornerRadius:3];
    [view setBackgroundColor:[UIColor orangeColor]];
    [view setAlpha:0];
    [acoreTextView.superview addSubview:view];
    [UIView animateWithDuration:0.2 animations:^{
        [view setAlpha:0.4];
    } completion:^(BOOL finished) {
        [UIView animateWithDuration:0.5 animations:^{
            [view setAlpha:0];
        }];
    }];
    
    return;
    
    NSURL *url = [data objectForKey:FTCoreTextDataURL];
    if (!url) return;
    [[UIApplication sharedApplication] openURL:url];
}

注:内容中的标签必须是定制，必要时需求用正则替换一下图片，如将:<img src="http://www.baidu.com/img/123.png">的图片url正则出来通过SDWebImage下载到本地

取出下载地址，在Library/Cacehes/download/kdlkaklklfkakfaasfklafalksf.png,替换后的格式如下:

<_image>app绝对路径/Library/Cacehes/download/kdlkaklklfkakfaasfklafalksf.png</_image>

即可显示

3.有一种情况复杂情况下，使用上述三种RTLabel、RCLabel、FTCoreText都不会达到很好的控制，
   就是在内容中有大量网络图片，像UIView显示的大量数学公式类的图片，这种情况使用
  UIWebView结合CSS控制会达到比较好的效果如图,部分代码如下:

//预加载webView视图到_webViewAry
        _webView = [[FDWebView alloc] initWithFrame:CGRectMake(FD_SCREEN_MAIN_WIDTH*i, 61, FD_SCREEN_MAIN_WIDTH, FD_SCREEN_SHOW_HEIGHT)];
        [_webView setBackgroundColor:[UIColor whiteColor]];
        _webView.tag = 2000+i;
        [_webView setDataDetectorTypes:UIDataDetectorTypeNone];
        [_webView setOpaque:YES];
        
        //webView滚动条控制
        [(UIScrollView *)[[_webView subviews] objectAtIndex:0] setBounces:NO];
        _webView.scrollView.bounces = NO;
        _webView.scrollView.alwaysBounceHorizontal = NO;
        _webView.scrollView.showsHorizontalScrollIndicator = NO;
        _webView.scrollView.showsVerticalScrollIndicator = YES;
        [_webViewAry addObject:_webView];

/**
 * 核心考点图文混排处理
 */
- (void)setCoreTestValueForDic:(BookTopicObject *)aTopicObject autoHeight:(BOOL)autoHeight
{
    //汇总创建HTML主体
    NSMutableString *_conString = [NSMutableString stringWithString:@"<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\"><html xmlns=\"http://www.w3.org/1999/xhtml\"><head><meta http-equiv='Content-Type' content='text/html; charset=UTF-8' /><meta name='viewport' content='width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no' /><style type='text/css'>@import url('weibo.css');</style></head><body>"];
    
    for (TopicSectionObject *_sectionObject in aTopicObject.sectionAry) {
        
        if (![_sectionObject.text isEqualToString:@""]) {
            NSString *content = [HtmlString transformString:_sectionObject.text];
            
            //解析
            [_conString appendFormat:@"<div class='titHead'><p class='title'>%@</p></div>", _sectionObject.title];
    
            //描述
            NSMutableString *_tmpStr = [NSMutableString stringWithString:content];
            [_conString appendFormat:@"<div class='txtConts'>%@</div><div class='xdbox' style='height:40px;'></div>", _tmpStr];
        }
    }
    
    //_conString = (NSMutableString *)[_conString stringByReplacingOccurrencesOfString:@"<br />" withString:@""];
    
    //结尾
    [_conString appendString:@"</body></html>"];
    
    [self setHTMLForString:_conString];
    
    //是否自适应高度
    if (autoHeight) {
        
        CGFloat _height = 0.0f;
        
        //正文
        _height += [_conString sizeWithFont:[UIFont systemFontOfSize:16] constrainedToSize:CGSizeMake(300, MAXFLOAT) lineBreakMode:NSLineBreakByWordWrapping].height;
        
        [self setFrame:CGRectMake(self.frame.origin.x, self.frame.origin.y, self.frame.size.width, _height)];
    }
}

/**
 * 格式化字符串
 */
+ (NSString *)transformString:(NSString *)originalStr
{
    //originalStr = [NSString stringWithFormat:@"中国人<img src='b966133768a30e1cbddfcf5db8e2ca16'  />%@<img src='http://www.kankanews.com/ICkengine/wp-content/themes/wsxcm3.0/images/logo.png'  />",originalStr];
    
    NSString *text = originalStr;
    
    //获取图片url地址并保存
    static NSString *_apiUrl;
    if (_apiUrl == nil) {
        _apiUrl = [[[NSObject SDGetConfig] objectForKey:@"apiUrl"] copy];
    }
    
    //解析img的src
    NSString *regTags = @"<img[^>]+src\\s*=\\s*['\"]([^'\"]+)['\"][^>]*>";
    
    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:regTags
                                                                          options:NSRegularExpressionCaseInsensitive    // 还可以加一些选项，例如：不区分大小写
                                                                            error:nil];
    
    NSArray* match = [regex matchesInString:text options:0 range:NSMakeRange(0, [text length])];
    if (match.count != 0)
    {
        NSMutableString *_targetImageHtml;
        for (NSTextCheckingResult *matc in match)
        {
            NSRange range = [matc range];
            
            //原图片img的html
            NSString *_tmpString = [originalStr substringWithRange:range];
            
            NSString *_regEx = @"<img[^>]+src=['\"](.*?)['\"][^>]*>";
            NSString *_keyString = [_tmpString stringByReplacingOccurrencesOfRegex:_regEx withString:@"$1"];
            
            if (![_keyString hasPrefix:@"http://"]) {
                
                //新url
                _targetImageHtml = [NSMutableString stringWithFormat:@"<img src='%@/atth/m/%@_0_15.png' />", _apiUrl, _keyString];
                
                //替换url
                text = [text stringByReplacingOccurrencesOfString:_tmpString withString:[NSString stringWithFormat:@"%@ ", _targetImageHtml]];
            }else{
                
                _targetImageHtml = [NSMutableString stringWithFormat:@"<img src='%@' />",  _keyString];
                text = [text stringByReplacingOccurrencesOfString:_tmpString withString:[NSString stringWithFormat:@"%@ ", _targetImageHtml]];
            }
        }
    }

    return text;
}

/**
 * 显示html赋值数据
 */
-(void)setHTMLForString:(NSString *)string
{
    [self loadHTMLString:string baseURL:[NSURL fileURLWithPath: [[NSBundle mainBundle] resourcePath] isDirectory: YES]];
}

效果如下，文字和图片样式还得CSS控制一下，像对齐格式，图片位置等:

最后，以下各种显示图文混排的方式，得根据我们在开发app的实际的不同需求，再选择一个最佳方案
就OK了，图文混排中还要考虑cell内容显示效率的问题，图片最好采用异步多线程预下载处理，这样体验上
会更好一些。