iOS 7的动态表格视图单元格高度(Dynamic Table view cell height for iOS 7)

我有一个包含tableview的视图控制器。表视图由包含单个标签的自定义单元格组成。我有不同长度的文本，将在这些单元格中显示。我面临的问题是，细胞没有扩展到适当的高度。我在SO中尝试了很多解决方案，但到目前为止它们都没有。这是视图控制器的代码

class ViewController: UIViewController { @IBOutlet var tableView: UITableView! let items = [ "This is the first text", "This is the first text and this is the second text","now you may be thinking where is the third text?. Well, There was the first text and second text, now here is the third text", "This is the fourth short and sweet text", "Slow down you crazy child, you're so ambitious for a juvenile. If you're so smart, tell me why are you still so afraid.","Where's the fire? What's the hurry about. You better cool it off before you burn it out. There's so much to do and so many hours in a day.You got your passion, got your pride. Don't you know that only fools are satisfied. Dream on but don't imagine that they come true. Don't even realise vienna waits for you"] var prototypeCell:CustomCell! override func viewDidLoad() { super.viewDidLoad() //setting up tableview self.tableView.allowsSelection = false self.tableView.dataSource = self self.tableView.delegate = self configurePrototypeCell() } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } func configureCell(cell:CustomCell, forIndexPath indexPath:NSIndexPath) { cell.itemLabel.text = items[indexPath.row] } func configurePrototypeCell() { self.prototypeCell = self.tableView.dequeueReusableCellWithIdentifier("Cell") as! CustomCell } } extension ViewController:UITableViewDataSource { func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell { let cell = tableView.dequeueReusableCellWithIdentifier("Cell") as! CustomCell configureCell(cell, forIndexPath: indexPath) return cell } func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int { return items.count } } extension ViewController: UITableViewDelegate { func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat { self.prototypeCell.itemLabel.text = items[indexPath.row] self.prototypeCell.itemLabel.preferredMaxLayoutWidth = CGRectGetWidth(self.tableView.frame) self.prototypeCell.setNeedsLayout() self.prototypeCell.layoutIfNeeded() let size = self.prototypeCell.contentView.systemLayoutSizeFittingSize(UILayoutFittingCompressedSize) let height = size.height return height } func tableView(tableView: UITableView, estimatedHeightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat { return UITableViewAutomaticDimension } }

CustomCell类是UITableViewCell子类。它包含名为itemLabel的UILabel 。

I have a view controller containing tableview. Table view consists of custom cell containing single label. I have text of varying length which are to be shown in those cells. The problem i am facing is that, the cells are not getting expanded to the appropriate height. I have tried many solutions present in SO but none of them are working so far. Here is the code for view controller

class ViewController: UIViewController { @IBOutlet var tableView: UITableView! let items = [ "This is the first text", "This is the first text and this is the second text","now you may be thinking where is the third text?. Well, There was the first text and second text, now here is the third text", "This is the fourth short and sweet text", "Slow down you crazy child, you're so ambitious for a juvenile. If you're so smart, tell me why are you still so afraid.","Where's the fire? What's the hurry about. You better cool it off before you burn it out. There's so much to do and so many hours in a day.You got your passion, got your pride. Don't you know that only fools are satisfied. Dream on but don't imagine that they come true. Don't even realise vienna waits for you"] var prototypeCell:CustomCell! override func viewDidLoad() { super.viewDidLoad() //setting up tableview self.tableView.allowsSelection = false self.tableView.dataSource = self self.tableView.delegate = self configurePrototypeCell() } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } func configureCell(cell:CustomCell, forIndexPath indexPath:NSIndexPath) { cell.itemLabel.text = items[indexPath.row] } func configurePrototypeCell() { self.prototypeCell = self.tableView.dequeueReusableCellWithIdentifier("Cell") as! CustomCell } } extension ViewController:UITableViewDataSource { func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell { let cell = tableView.dequeueReusableCellWithIdentifier("Cell") as! CustomCell configureCell(cell, forIndexPath: indexPath) return cell } func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int { return items.count } } extension ViewController: UITableViewDelegate { func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat { self.prototypeCell.itemLabel.text = items[indexPath.row] self.prototypeCell.itemLabel.preferredMaxLayoutWidth = CGRectGetWidth(self.tableView.frame) self.prototypeCell.setNeedsLayout() self.prototypeCell.layoutIfNeeded() let size = self.prototypeCell.contentView.systemLayoutSizeFittingSize(UILayoutFittingCompressedSize) let height = size.height return height } func tableView(tableView: UITableView, estimatedHeightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat { return UITableViewAutomaticDimension } }

CustomCell class is subclass of UITableViewCell. It contains UILabel named itemLabel.