ZSSRichTextEditor 是一款基于 webView 的富文本编辑器。由于项目需要，对ZSSRichTextEditor的UI进行了修改，添加了标题、输入回调、多图上传等。github：https://github.com/Ymuyangyin/ZWTextEditor

JS调用OC

通过WKWebViewDelegate代理方法，来监听输入字数等方法

- (void)webView:(WKWebView*)webView decidePolicyForNavigationAction:(WKNavigationAction*)navigationAction decisionHandler:(void(^)(WKNavigationActionPolicy))decisionHandler{
    NSString *urlString = navigationAction.request.URL.absoluteString;
    
    YPLog(@"decidePolicyForNavigationAction = %@",urlString);
    [self.webView updatePlaceHolderStatu];
    [self fontBarUpdateWithString:urlString];
    [self handleWithString:urlString];
    
    WeakSelf(self);
    [webView getCaretYPositionPositionHandleCallback:^(id  _Nullable obj, NSError * _Nullable error) {
        CGFloat currentPos = [obj floatValue];
        if (currentPos  > SCREEN_HEIGHT - weakself.keboardHeight - 49) {
            [weakself.webView autoScrollTop:currentPos+weakself.toolBarView.yp_height];
        }
    }];

    decisionHandler(WKNavigationActionPolicyAllow); // 必须实现 加载
}
- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation{
    if ([YPStringUtils isNotEmpty:self.titles]) {
        [webView setupTitle:self.titles];
    }
    if ([YPStringUtils isNotEmpty:self.content]) {
        [webView setupContent:self.content];
        [webView placeHolderWithHidden:YES];
    }
}

OC调用JS

oc调用js是通过- (void)evaluateJavaScript:(NSString *)javaScriptString completionHandler:(void (^ _Nullable)(_Nullable id, NSError * _Nullable error))completionHandler注入js代码
具体的实现在WKWebView+ZWWKWebViewExtension文件中

- (void)evaluateJavaScriptRelust:(NSString *)jsAction
                              Callback:(void (^)(id _Nullable obj, NSError * _Nullable error))callback{
    dispatch_async(dispatch_get_main_queue(), ^{
        [self evaluateJavaScript:jsAction completionHandler:^(id _Nullable obj, NSError * _Nullable error) {
            YPLog(@"jsAction == %@, obj == %@ , ERROR == %@ ",jsAction,error,obj);
            if (callback) {
                callback(obj,error);
            }
        }];
    });
    
}

新增标题和输入字数监听

在RichEditor.html文件中

        <div id="title">
            <textarea id="article_title" line-height="normal" style= "overflow:hidden; resize:none; " placeholder="请输入标题" maxlength="30000" ></textarea>
        </div>
        
        <div id="title_tips">
            <input id="article_title_tips" name="vj_article_title_tips" readonly="readonly" type="text" value="标题字数不可超过25字" style="border:none; display:none">
        </div>

使用方法

通过继承ZSSRichTextEditor