UITableViewCell嵌套UIWebView

待我称王封你为后i 2023-10-17 14:10 39阅读 0赞

原文地址[点击打开链接][Link 1]

项目需求：UITableViewCell嵌套UIWebView，并且让UIWebView根据内容自适应高度。

#### 1 获取UIWebView高度 ####

- (void)webViewDidFinishLoad:(UIWebView *)webView
    {
        // 如果要获取webView高度必须在网页加载完成之后获取
    
        // 方法一
        CGFloat height = [self.webView sizeThatFits:CGSizeZero].height;
    
        // 方法二
        CGFloat height = webView.scrollView.contentSize.height;
    
        // 方法三 （不推荐使用，当webView.scalesPageToFit = YES计算的高度不准确）
        CGFloat height = [[self.webView stringByEvaluatingJavaScriptFromString:@"document.body.offsetHeight"] floatValue];
    }

#### 2 UIWebView加载完成后cell高度的更新，使用通知来实现。 ####

TableViewCell.m

- (void)webViewDidFinishLoad:(UIWebView *)webView
    {
        CGSize fittingSize = [self.webView sizeThatFits:CGSizeZero];
        self.height = fittingSize.height;
        self.webView.frame = CGRectMake(0, 0, fittingSize.width, fittingSize.height);
    
        // 用通知发送加载完成后的高度
        [[NSNotificationCenter defaultCenter] postNotificationName:@"WEBVIEW_HEIGHT" object:self userInfo:nil];
    }

ViewController.m

- (void)viewDidLoad
    {
        [super viewDidLoad];
    
        // 用于缓存cell高度
        self.heightDic = [[NSMutableDictionary alloc] init];
    
        // 注册加载完成高度的通知
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(noti:) name:@"WEBVIEW_HEIGHT" object:nil];
    }
    
    - (void)noti:(NSNotification *)sender
    {
        TableViewCell *cell = [sender object];
    
        if (![self.heightDic objectForKey:[NSString stringWithFormat:@"%ld",cell.tag]]||[[self.heightDic objectForKey:[NSString stringWithFormat:@"%ld",cell.tag]] floatValue] != cell.height)
        {
            [self.heightDic setObject:[NSNumber numberWithFloat:cell.height] forKey:[NSString stringWithFormat:@"%ld",cell.tag]];
           [self.tableView reloadRowsAtIndexPaths:@[[NSIndexPath indexPathForRow:cell.tag inSection:0]] withRowAnimation:UITableViewRowAnimationNone];
        }
    }

![图片1][1]

#### 3 完整项目工程 ####

[https://github.com/YiQieSuiYuan/Demo/tree/master/WebView\_cell][https_github.com_YiQieSuiYuan_Demo_tree_master_WebView_cell]

#### 4 参考 ####

[http://www.jianshu.com/p/e199496a8b8a][http_www.jianshu.com_p_e199496a8b8a]

[Link 1]: http://blog.cocoachina.com/article/28772
[1]: http://blog.zlcode.com/wp-content/uploads/2016/04/ios-webview-cell-1.png
[https_github.com_YiQieSuiYuan_Demo_tree_master_WebView_cell]: https://github.com/YiQieSuiYuan/Demo/tree/master/WebView_cell
[http_www.jianshu.com_p_e199496a8b8a]: http://www.jianshu.com/p/e199496a8b8a