Swift-Automatically expand cells when you click UITableView cells

The following is a demo of the collapse spread effect of cell cell. When you click a cell, the cell expands to show some details. Clicking on another cell will turn off the original and animate.

The effect is as follows:

The code is as follows:

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import UIKitclass ViewController: UIViewController,UITableViewDelegate,UITableViewDataSource {        var tableView:UITableView?        var ctrlnames:[String] = ["UILabel 标签","UIButton 按钮","UIDatePiker 日期选择器",        "UITableView 表格视图"]        var selectedCellIndexPath:NSIndexPath!         override func viewDidLoad() {        super.viewDidLoad()                //创建表视图        self.tableView = UITableView(frame: UIScreen.mainScreen().applicationFrame,            style:UITableViewStyle.Plain)        self.tableView!.delegate = self        self.tableView!.dataSource = self        //创建一个重用的单元格        self.tableView!.registerClass(UITableViewCell.self, forCellReuseIdentifier: "SwiftCell")        self.view.addSubview(self.tableView!)    }        //在本例中，只有一个分区    func numberOfSectionsInTableView(tableView: UITableView!) -> Int {        return 1;    }        //返回表格行数（也就是返回控件数）    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {        return self.ctrlnames.count    }        //创建各单元显示内容(创建参数indexPath指定的单元）    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath)        -> UITableViewCell    {        var label =  UILabel(frame:CGRectZero)        label.setTranslatesAutoresizingMaskIntoConstraints(false)        label.text = self.ctrlnames[indexPath.row]                var textview=UITextView(frame:CGRectZero)        textview.setTranslatesAutoresizingMaskIntoConstraints(false)        textview.textColor = UIColor.grayColor()        //演示效果，暂时写死        textview.text = "UIDatePicker 是一个控制器类，封装了 UIPickerView，但是他是UIControl的子类，"                let identify:String = "SwiftCell"        var cell = UITableViewCell(style: UITableViewCellStyle.Default, reuseIdentifier:identify)        //自动遮罩不可见区域,超出的不显示        cell.layer.masksToBounds = true        cell.contentView.addSubview(label)        cell.contentView.addSubview(textview)                //创建一个控件数组        var views:NSMutableDictionary = NSMutableDictionary()        views.setValue(label, forKey: "label")        views.setValue(textview, forKey: "textview")        cell.contentView.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat(            "H:|-15-[label]-15-|", options: nil, metrics: nil, views: views))        cell.contentView.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat(            "H:|-15-[textview]-15-|", options: nil, metrics: nil, views: views))        cell.contentView.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat(            "V:|[label(40)]", options: nil, metrics: nil, views: views))        cell.contentView.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat(            "V:|-40-[textview(80)]", options: nil, metrics: nil, views: views))        return cell    }        // UITableViewDelegate 方法，处理列表项的选中事件    func tableView(tableView: UITableView!, didSelectRowAtIndexPath indexPath: NSIndexPath!)    {        self.tableView!.deselectRowAtIndexPath(indexPath, animated: false)        selectedCellIndexPath = indexPath        // Forces the table view to call heightForRowAtIndexPath        tableView!.reloadRowsAtIndexPaths([indexPath],            withRowAnimation: UITableViewRowAnimation.Automatic)            }       //点击单元格会引起cell高度的变化，所以要重新设置    func tableView(tableView: UITableView,        heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {            if(selectedCellIndexPath != nil && selectedCellIndexPath == indexPath){                return 120            }            return 40    }}

Swift-Automatically expand cells when you click UITableView cells