Swift

下面是一个列表单元格cell的折叠展开效果的demo。当点击单元格时会展开该单元格,便于显示一些详情什么的。点击其他单元格原来的会关闭,同时有动画效果。


效果如如下:
 

代码如下:

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import UIKit
 
class 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
    }
}
原文地址:https://www.cnblogs.com/Free-Thinker/p/4843323.html