Swift:如何在不重新加载数据的情况下重新加载 UITableViewCell 中的行高

Question

我有一个案例，我必须只重新加载 UITableViewCell 的高度。

但是如果我调用这个函数

tableView.reloadRowsAtIndexPaths([NSIndexPath(forRow: webView.tag, inSection: 0)], withRowAnimation: .Automatic)

它重新加载单元格的高度和数据。 我怎样才能在 Swift 中控制单元格的高度？

这是我的 cellForRow block :

    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    if indexPath.row == 0 {
        let cell = tableView.dequeueReusableCellWithIdentifier("cell1", forIndexPath: indexPath) as! CustomTableViewCell1
    cell.heading.text = headerText
        return cell
    }

    else if indexPath.row == 1 {
        let cell = tableView.dequeueReusableCellWithIdentifier("cell2", forIndexPath: indexPath) as! CustomTableViewCell2
        ImageLoader.sharedLoader.imageForUrl(self.headerImage , completionHandler:{(image: UIImage?, url: String) in
            cell.mainImage.image = image
        })
        return cell
    }
    else if indexPath.row == 2 {
        let cell = tableView.dequeueReusableCellWithIdentifier("cell3", forIndexPath: indexPath) as! CustomTableViewCell3
        //cell.aurthorImage.image = UIImage(named : "obama")
        ImageLoader.sharedLoader.imageForUrl(self.headerImage , completionHandler:{(image: UIImage?, url: String) in
            cell.aurthorImage.image = image
        })
        cell.aurthorImage.tag = aurthorID
        cell.aurthorImage.layer.cornerRadius = cell.aurthorImage.frame.height/2
        cell.aurthorImage.clipsToBounds = true
        cell.aurthorImage.userInteractionEnabled = true
        cell.aurthorImage.addGestureRecognizer(aurthorImageTapRecignizer)
        cell.aurthorName.text = self.authorName
        cell.time.text = self.time
        self.followButton = cell.followButton
        return cell
    }

    else if indexPath.row == 3 {
        let cell = tableView.dequeueReusableCellWithIdentifier("cell4", forIndexPath: indexPath) as! CustomTableViewCell4
        let htmlHeight = contentHeights[indexPath.row]

        cell.webElement.tag = indexPath.row
        cell.webElement.delegate = self
        cell.webElement.loadHTMLString(HTMLContent, baseURL: nil)
        cell.webElement.frame = CGRectMake(0, 0, cell.frame.size.width, htmlHeight)

        return cell
    }
    else if indexPath.row == 4 {
        let cell = tableView.dequeueReusableCellWithIdentifier("cell1", forIndexPath: indexPath) as! CustomTableViewCell1
        cell.heading.text = "Related Posts"
        return cell
    }
    else if indexPath.row == 5{
        let cell = tableView.dequeueReusableCellWithIdentifier("cell6", forIndexPath: indexPath) as! CustomTableViewCell6
        return cell

    }
    else if indexPath.row == 6 {
        let cell = tableView.dequeueReusableCellWithIdentifier("cell1", forIndexPath: indexPath) as! CustomTableViewCell1
        cell.heading.text = "Comments"
        return cell
    }
    else if indexPath.row == 7 {

        let cell = tableView.dequeueReusableCellWithIdentifier("cell5", forIndexPath: indexPath) as! CustomTableViewCell5


        let htmlHeight = contentHeights[indexPath.row]
        self.commentSection = cell.commentsView
        self.commentSection.tag = indexPath.row
        self.commentSection.delegate = self
        let url = NSURL(string: commentsURL)
        let requestObj = NSURLRequest(URL: url! )
        self.commentSection.loadRequest(requestObj)
        self.commentSection.frame = CGRectMake(0, 0, cell.frame.size.width, htmlHeight)
            commentSectionDidNotLoad = false

            return cell
    }
    else {
        let cell = tableView.dequeueReusableCellWithIdentifier("cell1", forIndexPath: indexPath) as! CustomTableViewCell1
        cell.heading.text = headerText
        return cell
    }

Answer 1

您可以使用此代码更新单元格的高度而无需重新加载它们的数据:

tableView.beginUpdates()
tableView.endUpdates()

You can also use this method followed by the endUpdates method to animate the change in the row heights without reloading the cell.

UITableView Class Reference