css style、css color 转 UIColor

你能看过来，就说明这个问题很好玩！IT开发是一个兴趣，更是一个挑战！兴趣使你工作有热情。挑战使让你工作充满刺激拉满的状态！我们日复一日年复一年的去撸代码，那些普普通通的功能代码，已经厌倦了！要的就是这种充满挑战最终攻克而带来快感！这种快感比那种快感让人感觉更得劲。。错了，可能是我老了吧~

因为业务开发需求，同样的功能三端(WEB、安卓、iOS)，而web端将数据封装成H5对应的标签方式，需要APP端来解析，将其文本提取出来倒没有什么技术难度，但核心问题是要取出相应的样式表渲染成正确的UI，这才是最困难的！

 如<b><span style="color:orange,font-size:15px;">重要告警</span></b>

要把它显示成如下的原生页面，怎么办呢？来分析一下这些标签的作用：

<b></b>意思是将里面的文本加粗显示

<span>标签普通的文本显示，但是文本的更多属性是在span的内联样式表中存放，我们要取出来颜色，字体大小来渲染为iOS的UILabel,通过setColor,setTextFont等API设置其显示样式！

我得到的原始数据为：


<b><a style="color:orange">【重要告警】</a></b>
<b>事件名称：</b>CCE-CPU监控;
<b>发生时间：</b>2023-11-08 09:48:00 GMT+08:00;
<b>事件源：</b>AOM;
<b>资源类型：</b>Application;
<b>指标名称：</b>aom_container_cpu_usage;
<b>最新指标值:  </b>45.95425;
<b>命名空间：</b>third-party;
<b>容器名称：</b>z-canal-test;
<b>告警信息：</b><br />阈值规则 CCE-CPU监控 状态从 “超限阈值” 变为 “正常” 。状态变化详细信息：指标名称为“aom_container_cpu_usage”，最新指标数据取值“45.954”，不满足阈值条件“>90”。;
<b>修复建议：</b>建议进入容器  z-canal-test查看资源使用情况;

最终实现的显示效果为：

下面业结合开源的三方库来实现此功能的显示，第三方库：TFHpple


#if __has_include("TFHpple.h")
#import "TFHpple.h"
#endif
 
@interface CSSStyleMap : NSObject
+ (NSDictionary *)cssColorMap;
 
#if __has_include("TFHpple.h")
+ (UIColor *)colorFromCssText:(NSString *)ctext;
+ (NSMutableArray <NSMutableDictionary *>*)stylesFromElement:(TFHppleElement *)e;
#endif
@end


@implementation CSSStyleMap
//将CSS定义的颜色转为十六进制颜色
+ (NSDictionary *)cssColorMap
{
    NSString *k = @"{\
        \"CLEAR\": \"#00000000\",\
        \"TRANSPARENT\": \"#00000000\",\
        \"\": \"#00000000\",\
        \"ALICEBLUE\": \"#F0F8FF\",\
        \"ANTIQUEWHITE\": \"#FAEBD7\",\
        \"AQUA\": \"#00FFFF\",\
        \"AQUAMARINE\": \"#7FFFD4\",\
        \"AZURE\": \"#F0FFFF\",\
        \"BEIGE\": \"#F5F5DC\",\
        \"BISQUE\": \"#FFE4C4\",\
        \"BLACK\": \"#000000\",\
        \"BLANCHEDALMOND\": \"#FFEBCD\",\
        \"BLUE\": \"#0000FF\",\
        \"BLUEVIOLET\": \"#8A2BE2\",\
        \"BROWN\": \"#A52A2A\",\
        \"BURLYWOOD\": \"#DEB887\",\
        \"CADETBLUE\": \"#5F9EA0\",\
        \"CHARTREUSE\": \"#7FFF00\",\
        \"CHOCOLATE\": \"#D2691E\",\
        \"CORAL\": \"#FF7F50\",\
        \"CORNFLOWERBLUE\": \"#6495ED\",\
        \"CORNSILK\": \"#FFF8DC\",\
        \"CRIMSON\": \"#DC143C\",\
        \"CYAN\": \"#00FFFF\",\
        \"DARKBLUE\": \"#00008B\",\
        \"DARKCYAN\": \"#008B8B\",\
        \"DARKGOLDENROD\": \"#B8860B\",\
        \"DARKGRAY\": \"#A9A9A9\",\
        \"DARKGREY\": \"#A9A9A9\",\
        \"DARKGREEN\": \"#006400\",\
        \"DARKKHAKI\": \"#BDB76B\",\
        \"DARKMAGENTA\": \"#8B008B\",\
        \"DARKOLIVEGREEN\": \"#556B2F\",\
        \"DARKORANGE\": \"#FF8C00\",\
        \"DARKORCHID\": \"#9932CC\",\
        \"DARKRED\": \"#8B0000\",\
        \"DARKSALMON\": \"#E9967A\",\
        \"DARKSEAGREEN\": \"#8FBC8F\",\
        \"DARKSLATEBLUE\": \"#483D8B\",\
        \"DARKSLATEGRAY\": \"#2F4F4F\",\
        \"DARKSLATEGREY\": \"#2F4F4F\",\
        \"DARKTURQUOISE\": \"#00CED1\",\
        \"DARKVIOLET\": \"#9400D3\",\
        \"DEEPPINK\": \"#FF1493\",\
        \"DEEPSKYBLUE\": \"#00BFFF\",\
        \"DIMGRAY\": \"#696969\",\
        \"DIMGREY\": \"#696969\",\
        \"DODGERBLUE\": \"#1E90FF\",\
        \"FIREBRICK\": \"#B22222\",\
        \"FLORALWHITE\": \"#FFFAF0\",\
        \"FORESTGREEN\": \"#228B22\",\
        \"FUCHSIA\": \"#FF00FF\",\
        \"GAINSBORO\": \"#DCDCDC\",\
        \"GHOSTWHITE\": \"#F8F8FF\",\
        \"GOLD\": \"#FFD700\",\
        \"GOLDENROD\": \"#DAA520\",\
        \"GRAY\": \"#808080\",\
        \"GREY\": \"#808080\",\
        \"GREEN\": \"#008000\",\
        \"GREENYELLOW\": \"#ADFF2F\",\
        \"HONEYDEW\": \"#F0FFF0\",\
        \"HOTPINK\": \"#FF69B4\",\
        \"INDIANRED\": \"#CD5C5C\",\
        \"INDIGO\": \"#4B0082\",\
        \"IVORY\": \"#FFFFF0\",\
        \"KHAKI\": \"#F0E68C\",\
        \"LAVENDER\": \"#E6E6FA\",\
        \"LAVENDERBLUSH\": \"#FFF0F5\",\
        \"LAWNGREEN\": \"#7CFC00\",\
        \"LEMONCHIFFON\": \"#FFFACD\",\
        \"LIGHTBLUE\": \"#ADD8E6\",\
        \"LIGHTCORAL\": \"#F08080\",\
        \"LIGHTCYAN\": \"#E0FFFF\",\
        \"LIGHTGOLDENRODYELLOW\": \"#FAFAD2\",\
        \"LIGHTGRAY\": \"#D3D3D3\",\
        \"LIGHTGREY\": \"#D3D3D3\",\
        \"LIGHTGREEN\": \"#90EE90\",\
        \"LIGHTPINK\": \"#FFB6C1\",\
        \"LIGHTSALMON\": \"#FFA07A\",\
        \"LIGHTSEAGREEN\": \"#20B2AA\",\
        \"LIGHTSKYBLUE\": \"#87CEFA\",\
        \"LIGHTSLATEGRAY\": \"#778899\",\
        \"LIGHTSLATEGREY\": \"#778899\",\
        \"LIGHTSTEELBLUE\": \"#B0C4DE\",\
        \"LIGHTYELLOW\": \"#FFFFE0\",\
        \"LIME\": \"#00FF00\",\
        \"LIMEGREEN\": \"#32CD32\",\
        \"LINEN\": \"#FAF0E6\",\
        \"MAGENTA\": \"#FF00FF\",\
        \"MAROON\": \"#800000\",\
        \"MEDIUMAQUAMARINE\": \"#66CDAA\",\
        \"MEDIUMBLUE\": \"#0000CD\",\
        \"MEDIUMORCHID\": \"#BA55D3\",\
        \"MEDIUMPURPLE\": \"#9370DB\",\
        \"MEDIUMSEAGREEN\": \"#3CB371\",\
        \"MEDIUMSLATEBLUE\": \"#7B68EE\",\
        \"MEDIUMSPRINGGREEN\": \"#00FA9A\",\
        \"MEDIUMTURQUOISE\": \"#48D1CC\",\
        \"MEDIUMVIOLETRED\": \"#C71585\",\
        \"MIDNIGHTBLUE\": \"#191970\",\
        \"MINTCREAM\": \"#F5FFFA\",\
        \"MISTYROSE\": \"#FFE4E1\",\
        \"MOCCASIN\": \"#FFE4B5\",\
        \"NAVAJOWHITE\": \"#FFDEAD\",\
        \"NAVY\": \"#000080\",\
        \"OLDLACE\": \"#FDF5E6\",\
        \"OLIVE\": \"#808000\",\
        \"OLIVEDRAB\": \"#6B8E23\",\
        \"ORANGE\": \"#FFA500\",\
        \"ORANGERED\": \"#FF4500\",\
        \"ORCHID\": \"#DA70D6\",\
        \"PALEGOLDENROD\": \"#EEE8AA\",\
        \"PALEGREEN\": \"#98FB98\",\
        \"PALETURQUOISE\": \"#AFEEEE\",\
        \"PALEVIOLETRED\": \"#DB7093\",\
        \"PAPAYAWHIP\": \"#FFEFD5\",\
        \"PEACHPUFF\": \"#FFDAB9\",\
        \"PERU\": \"#CD853F\",\
        \"PINK\": \"#FFC0CB\",\
        \"PLUM\": \"#DDA0DD\",\
        \"POWDERBLUE\": \"#B0E0E6\",\
        \"PURPLE\": \"#800080\",\
        \"RED\": \"#FF0000\",\
        \"ROSYBROWN\": \"#BC8F8F\",\
        \"ROYALBLUE\": \"#4169E1\",\
        \"SADDLEBROWN\": \"#8B4513\",\
        \"SALMON\": \"#FA8072\",\
        \"SANDYBROWN\": \"#F4A460\",\
        \"SEAGREEN\": \"#2E8B57\",\
        \"SEASHELL\": \"#FFF5EE\",\
        \"SIENNA\": \"#A0522D\",\
        \"SILVER\": \"#C0C0C0\",\
        \"SKYBLUE\": \"#87CEEB\",\
        \"SLATEBLUE\": \"#6A5ACD\",\
        \"SLATEGRAY\": \"#708090\",\
        \"SLATEGREY\": \"#708090\",\
        \"SNOW\": \"#FFFAFA\",\
        \"SPRINGGREEN\": \"#00FF7F\",\
        \"STEELBLUE\": \"#4682B4\",\
        \"TAN\": \"#D2B48C\",\
        \"TEAL\": \"#008080\",\
        \"THISTLE\": \"#D8BFD8\",\
        \"TOMATO\": \"#FF6347\",\
        \"TURQUOISE\": \"#40E0D0\",\
        \"VIOLET\": \"#EE82EE\",\
        \"WHEAT\": \"#F5DEB3\",\
        \"WHITE\": \"#FFFFFF\",\
        \"WHITESMOKE\": \"#F5F5F5\",\
        \"YELLOW\": \"#FFFF00\",\
        \"YELLOWGREEN\": \"#9ACD32\"\
    }";
    
    NSDictionary *map = [JsonKit jsonObject:k];
    return map;
}
 
#if __has_include("TFHpple.h")
+ (UIColor *)colorFromCssText:(NSString *)val
{
    NSString *cl = [[CSSStyleMap cssColorMap] stringForKey:val];
    UIColor *color = nil;
    if (cl.length > 0)
    {
        color = [UIColor colorFromHex:cl];
    }
    else
    {
        val = [val stringByReplacingOccurrencesOfString:@"rgba(" withString:@""];
        val = [val stringByReplacingOccurrencesOfString:@"rgb(" withString:@""];
        val = [val stringByReplacingOccurrencesOfString:@")" withString:@""];
        
        NSArray *zlist = [val componentsSeparatedByString:@","];
        if (zlist.count >= 3)
        {
            color = [UIColor colorWithRed:[zlist[0] doubleValue]/255.0 green:[zlist[1] doubleValue]/255.0 blue:[zlist[2] doubleValue]/255.0 alpha:zlist.count>3?[zlist[3] doubleValue]:1];
        }
    }
    
    return color;
}
 
 
+ (NSMutableArray <NSMutableDictionary *>*)stylesFromElement:(TFHppleElement *)e
{
    NSString *b = [e content];
    NSArray <TFHppleElement *> *child = [e children];
    NSMutableArray *attributesList = [NSMutableArray arrayWithCapacity:0];
    
    [child enumerateObjectsUsingBlock:^(TFHppleElement * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
        if (![obj isTextNode])
        {
            /*企管只关注CSS样式中的color,backgroudColor,fontSize这三个属性，其余根据后期要求再解析展示
            CSS对于样式的定义为：color:orange,font-size:16px,background-color:xxx
             */
            NSDictionary *attrMap = [obj attributes];
            [attrMap enumerateKeysAndObjectsUsingBlock:^(id  _Nonnull key, id  _Nonnull obj, BOOL * _Nonnull stop)
            {
                if (obj && [obj isKindOfClass:[NSString class]])
                {
                    NSArray *plist = [obj componentsSeparatedByString:@","];
                    [plist enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop)
                    {
                        NSArray *xlist = [obj componentsSeparatedByString:@":"];
                        if ([xlist.firstObject isEqualToString:@"color"])
                        {
                            NSString *val = [[xlist lastObject] uppercaseString];
                            UIColor *color = [CSSStyleMap colorFromCssText:val];
                            if (color)
                            {
                                [attributesList addObject:@{@"fontColor":color,@"range":[NSValue valueWithRange:NSMakeRange(0, b.length)]}];
                            }
                        }
                        else if ([xlist.firstObject isEqualToString:@"background-color"])
                        {
                            NSString *val = [[xlist lastObject] uppercaseString];
                            UIColor *color = [CSSStyleMap colorFromCssText:val];
                            if (color)
                            {
                                [attributesList addObject:@{@"backgroundColor":color,@"range":[NSValue valueWithRange:NSMakeRange(0, b.length)]}];
                            }
                        }
                        else if ([xlist.firstObject isEqualToString:@"font-size"])
                        {
                            NSInteger val = [[xlist lastObject] integerValue];
                            [attributesList addObject:@{@"fontSize":intToStr(val),@"range":[NSValue valueWithRange:NSMakeRange(0, b.length)]}];
                        }
                    }];
                }
                
            }];
        }
    }];
    
    return attributesList;
}
#endif
@end

页面使用：

NSData *tdata = [cnt dataUsingEncoding:NSUTF8StringEncoding];
TFHpple *doc = [[TFHpple alloc] initWithHTMLData:tdata];
TFHppleElement *e = [[doc searchWithXPathQuery:@"//b"] firstObject];
 
//包含解析出来的样式数据列表
NSMutableArray <NSMutableDictionary *>*styleList = [CSSStyleMap stylesFromElement:e];


//加粗
NSMutableArray <NSValue *>*btagList = [rMap arrayForKey:@"bTag"];
//a标签，跳转
NSMutableArray <NSDictionary *>*atagList = [rMap arrayForKey:@"aTag"];
//CSS样式
NSMutableArray <NSDictionary *>*styleList = [rMap arrayForKey:@"style"];
 
//textView是定义的UITextView的实例对象
 
NSMutableAttributedString *mtext = [[NSMutableAttributedString alloc] initWithAttributedString:textView.attributedText];
NSString *textStr = mtext.string;
//        NSArray *ranges = [self mutableRangeOfString:@"®[^\\s]+" targetString:textStr];
 
 
[btagList enumerateObjectsUsingBlock:^(NSValue *a, NSUInteger idx, BOOL * _Nonnull stop)
{
    [mtext addAttribute:NSFontAttributeName value:[UIFont boldSystemFontOfSize:imTextFont(16)] range:a.rangeValue];
}];
 
[atagList enumerateObjectsUsingBlock:^(NSDictionary * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop)
{
    NSRange range = [(NSValue *)[obj objectForKey:@"range"] rangeValue];
    [mtext addAttribute:NSForegroundColorAttributeName value:[UIColor colorFromHex:@"#0000ee"] range:range];
    
    [mtext addAttribute:NSLinkTag value:[obj stringForKey:@"href"] range:range];
}];
 
[styleList enumerateObjectsUsingBlock:^(NSDictionary * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop)
{
    UIColor *fcolor = [obj objectForKey:@"fontColor"];
    NSRange range = [(NSValue *)[obj objectForKey:@"range"] rangeValue];
    [mtext addAttribute:NSForegroundColorAttributeName value:fcolor range:range];
}];
 
[textView setAttributedText:mtext];

这个示例只是展示其中一部分逻辑，你可以进行二次开发，扩展其功能，支持更多的属性的展示！

对了，肯定会有人说使用Webview直接加载就行了嘛，兄弟，我使用的场景是会话页面，你使用webview加载，就会存在性能体验问题！如果你全页面只有一个这样的消息，当然首选就是Webview，而我的页面如下，就不得不考虑用户体验！