UITableViewCell嵌套UIWebView

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];
}

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];
    }
}

完整项目工程

参考

http://www.jianshu.com/p/e199496a8b8a

http://blog.zlcode.com/2016/04/28/ios-webview-cell/