ios - UITableViewAutomaticDimension 在滚动之前不工作

Question

首次加载 TableView 时，所有可见单元格都是估计的行高。当我向下滚动时，单元格会自动调整大小，当我向上滚动时，最初 estimatedRowHeight 的单元格会自动调整大小。

一旦单元格自动调整大小，它们似乎就再也不会回到估计的行高度。

override func viewDidLoad() {
    super.viewDidLoad()
    self.navigationItem.backBarButtonItem = UIBarButtonItem(title: "", style: .Plain, target: nil, action: nil)
    self.tableView.estimatedRowHeight = 80.0
    self.tableView.rowHeight = UITableViewAutomaticDimension

    // Uncomment the following line to preserve selection between presentations
    // self.clearsSelectionOnViewWillAppear = false

    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
    // self.navigationItem.rightBarButtonItem = self.editButtonItem()
}

和

    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

    let cellIdentifier = "Cell"
    let cell = tableView.dequeueReusableCellWithIdentifier(cellIdentifier, forIndexPath: indexPath) as CustomTableViewCell

    // Configure the cell...
    let restaurant = restaurants[indexPath.row]
    cell.namelabel.text = restaurant.name
    cell.locationlabel.text = restaurant.location
    cell.typelabel.text = restaurant.type
    cell.thumbnailImageView.image = UIImage(named: restaurant.image)
    cell.thumbnailImageView.layer.cornerRadius = cell.thumbnailImageView.frame.size.width / 2
    cell.thumbnailImageView.clipsToBounds = true
    cell.accessoryType = restaurant.isVisited ? .Checkmark : .None

    return cell
}

关于如何让单元格最初自动调整大小的想法？

更新:从 Xcode 7 beta 6 开始，这不再是问题

Answer 1

只需在您的表格加载后调用“reloadSections”:

self.tableView.reloadSections(NSIndexSet(indexesInRange: NSMakeRange(0, self.tableView.numberOfSections())), withRowAnimation: .None)

或者在 Swift 3 中:

let range = Range(uncheckedBounds: (lower: 0, upper: self.tableView.numberOfSections))
self.tableView.reloadSections(IndexSet(integersIn: range), with: .none)