cell上使用自适应高度的webView

cell 上使用自适应高度的webView注意点
1.不能使用cell复用 出现问题：每次cell出现，或者消失，cell被复用，已经加载的webview都需要重新加载，加载成功重新刷新高度 ，在滑动刷新的过程会反复加载形成循环
2.再不使用复用的情况下，已经加载过的添加加载标示，不再重复加载，避免良妃资源，卡顿
3. 适用于cell个数不是太多的需求，

1. 创建cell

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSString * identify = [NSString stringWithFormat:@"%ld%ldcell",indexPath.row,indexPath.section];

        TasKStauesCell * cell = [tableView dequeueReusableCellWithIdentifier:identify];
        if (!cell) {
            cell = [[TasKStauesCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identify];
        }
         [self configureCell1:cell atIndexPath:indexPath withObject:nil];
        return cell;
    
}

2. 回掉刷新高度

- (void)configureCell1:(UITableViewCell *)defaultCell atIndexPath:(NSIndexPath *)indexPath withObject:(id)object {

        TasKStauesCell * cell = (TasKStauesCell *)defaultCell;
               __weak typeof(self) weakself = self;
               // 网页加载完毕回掉刷新高度
        cell.loagBlock = ^(CGFloat Height, NSIndexPath *indexPath) {
            [weakself.tableView reloadData];
        };
               cell.selectionStyle = UITableViewCellSelectionStyleNone;
               [cell bindObject:object atIndexPath:indexPath];

}

3. 创建webView

-(WKWebView *)webView
{
    if (!_webView) {
        NSString *jScript = @"var meta = document.createElement('meta'); meta.setAttribute('name', 'viewport'); meta.setAttribute('content', 'width=device-width'); document.getElementsByTagName('head')[0].appendChild(meta);";
        
        WKUserScript *wkUScript = [[WKUserScript alloc] initWithSource:jScript injectionTime:WKUserScriptInjectionTimeAtDocumentEnd forMainFrameOnly:YES];
        WKUserContentController *wkUController = [[WKUserContentController alloc] init];
        [wkUController addUserScript:wkUScript];
        WKWebViewConfiguration *wkWebConfig = [[WKWebViewConfiguration alloc] init];
        wkWebConfig.userContentController = wkUController;
        _webView = [[WKWebView alloc] initWithFrame:CGRectZero configuration:wkWebConfig];
        _webView.navigationDelegate = self;
        _webView.scrollView.bounces = NO;
        _webView.scrollView.alwaysBounceVertical = NO;
        _webView.scrollView.scrollEnabled = NO;
        //  [_webView loadHTMLString:<#(nonnull NSString *)#> baseURL:<#(nullable NSURL *)#>]
        
        // [_webView.scrollView addObserver:self forKeyPath:@"contentSize" options:NSKeyValueObservingOptionNew context:nil]; 监听contentsize 变化
        
    }
    return _webView;
}

4. 加载Html

-(void)bindObject:(id)object atIndexPath:(NSIndexPath *)indexPath{
  if (!self.object) {//已加载 不在重复z加载
            self.object = urlStr;
           // [self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:urlStr]]];
            [self.webView loadHTMLString:urlStr baseURL:nil];
            
        }
}

5.获取webVIew的高度

//页面加载完成之后调用
- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation {
   
   __weak typeof(self) weakself = self ;
   [webView evaluateJavaScript:@"document.body.offsetHeight;" completionHandler:^(id _Nullable any, NSError * _Nullable error) {
       
       NSString *heightStr = [NSString stringWithFormat:@"%@",any];
       NSLog(@"=********===%@*****%ld*****",heightStr,weakself.indexPath.row);
       if (weakself.tasKStaues==TasKStauesOfRefuse)
       {
           //方法一：
           //            [weakself.webView mas_updateConstraints:^(MASConstraintMaker *make) {
           //                make.height.mas_equalTo([heightStr floatValue]);
           //            }];
           //            [self.headerView mas_updateConstraints:^(MASConstraintMaker *make) {
           //                make.bottom.mas_equalTo(self.bgView.mas_bottom).mas_offset(-15-10-[heightStr floatValue]);
           //            }];
           //            self.heightWeb = [heightStr floatValue];
           //            if (self.loagBlock) {
           //                self.loagBlock([heightStr floatValue],self.indexPath);
           //            }
           //方法二：
           [weakself.webView mas_updateConstraints:^(MASConstraintMaker *make) {
               make.height.mas_equalTo(weakself.webView.scrollView.contentSize.height);
           }];
           [weakself.headerView mas_updateConstraints:^(MASConstraintMaker *make) {
               make.bottom.mas_equalTo(weakself.bgView.mas_bottom).mas_offset(-15-10-weakself.webView.scrollView.contentSize.height);
           }];
           weakself.heightWeb = weakself.webView.scrollView.contentSize.height;
           if (weakself.loagBlock) {
               weakself.loagBlock(weakself.webView.scrollView.contentSize.height,weakself.indexPath);
           }
       }
       
       
   }];
   
}

测试Html string
<body><img src=\"http://pic44.nipic.com/20140716/8716187_010828140000_2.jpg\" alt=\"picvision\" style=\"margin-top:10px;max-width:100%;\"><br>djfuffcjviii<br>dycjcudydy<br><img src=\"http://pic44.nipic.com/20140716/8716187_010828140000_2.jpg\" alt=\"picvision\" style=\"margin-top:10px;max-width:100%;\"><br>tjvkxitxcufuc<br>gdhcjcydidydy<br>gdycjcjfu<br>fhfjfifu<img src=\"http://pic44.nipic.com/20140716/8716187_010828140000_2.jpg\" alt=\"picvision\" style=\"margin-top:10px;max-width:100%;\"><br>giggigiiffiigoo<br><br></body>

目前只想到这个方法，有更好方法请通知我