IOS 提取HTML的图片或修改图片样式

想提取图片还是样式，以下方法已经满足的了，自己简单修改一下就可以了

/**
 过滤HTML字符串中的图片指定宽度
 
 @param width 宽度
 @return result
 */
- (NSString *)htmlWebAutoImageSizeWidth:(CGFloat)width{
    if (self == nil || self.length == 0) {
        return @"";
    }
    NSString *content = [self stringByReplacingOccurrencesOfString:@"&quot" withString:@"'"];
    content = [content stringByReplacingOccurrencesOfString:@"&lt;" withString:@"<"];
    content = [content stringByReplacingOccurrencesOfString:@"&gt;" withString:@">"];
    content = [content stringByReplacingOccurrencesOfString:@"&quot;" withString:@"\""];
    
    
    NSString *html = content;
    NSString * regExpStr = @"<(img|IMG)[^\\<\\>]*>";
    NSRegularExpression *regex=[NSRegularExpression regularExpressionWithPattern:regExpStr options:NSRegularExpressionCaseInsensitive error:nil];
    
    NSArray *matches=[regex matchesInString:html
                                    options:0
                                      range:NSMakeRange(0, [html length])];
    
    //HTML中的<img ...... />数组
    NSMutableArray *imgArray = [NSMutableArray array];
    //<img src="URL"/>中的URL数组
    NSMutableArray *urlArray = [NSMutableArray array];
    
    for (NSTextCheckingResult *result in matches) {
        NSRange range   = result.range;
        NSString *group = [html substringWithRange:range];
        NSRange srange1 = [group rangeOfString:@"http"];
        NSString *tempString1 = [group substringWithRange:NSMakeRange(srange1.location, group.length - srange1.location)];
        NSRange srange2 = [tempString1 rangeOfString:@"\""];
        NSString *tempString2 = [tempString1 substringWithRange:NSMakeRange(0,srange2.location)];
        [urlArray addObject:tempString2];
        [imgArray addObject:group];
    }
    
    for (int i = 0; i < imgArray.count; i++) {
        NSString *string = imgArray[i];
        //[NSDate timeStamp] 这个方法是获取时间戳的
        html = [html stringByReplacingOccurrencesOfString:string withString:[NSString stringWithFormat:@"<img src=\"%@\" title=\"\" alt=\"%lld\" width=\"%f\" height=\"auto\">",urlArray[i],[NSDate timeStamp]+i,width]];
    }
    
    
    return html;
}