ios: WebView内高亮搜索

// 注入 JS 查找
    NSString *resPath = [[NSBundle mainBundle] resourcePath];
    static NSString *jsQuery = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        jsQuery = [NSString stringWithContentsOfFile:[resPath stringByAppendingPathComponent:@"js_plugins.js"] encoding:NSUTF8StringEncoding error:nil];
        
    });
    NSString *js = [NSString stringWithFormat:@"var highlightPlugin = document.getElementById(‘js_plugins‘);                     if (highlightPlugin == undefined) {                     document.body.innerHTML += ‘<div id=\"js_plugins\"> \
                    <style type=\"text/css\"> \
                    .utaHighlight { background-color:yellow; }                     .selectSpan { background-color:yellow; color:red;}                     </style>                     </div>‘; \
                    %@                     }", jsQuery];
    
    [self stringByEvaluatingJavaScriptFromString:js];
    
    // 清除上次的高亮并设置当前关键字高亮
    [self stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:@"jQuery(‘body‘).removeHighlight().utaHighlight(‘%@‘);", str]];
    
    // 获取关键字数量
    NSString *count = [self stringByEvaluatingJavaScriptFromString:@"jQuery(‘.utaHighlight‘).length"];
    
    if ([count integerValue]>0) {
        [self focusToFindIndex:0];
    }