13.

所有可见的cell

let cells = tableView.visibleCells

animate

for (index,cell) in cells.enumerated() {
            cell.transform = CGAffineTransform(translationX: 0, y: tableHeight)
            UIView.animate(withDuration: 1.0,
                           delay: 0.05*Double(index),
                           usingSpringWithDamping: 0.8,
                           initialSpringVelocity: 0,
                           options: [],
                           animations: {
                cell.transform = CGAffineTransform(translationX: 0, y: 0)
                },
                           completion: nil)
        }

  • 学习代码:

  • CustomTableViewCell.swift

    import UIKit
    
    class CustomTableViewCell: UITableViewCell {
        
        let gradientLayer = CAGradientLayer()
    
        override func awakeFromNib() {
            super.awakeFromNib()
        }
    
        override func setSelected(_ selected: Bool, animated: Bool) {
            super.setSelected(selected, animated: animated)
        }
        
        override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
            super.init(style: style, reuseIdentifier: reuseIdentifier)
            
            gradientLayer.frame = self.bounds
            let color1 = UIColor(white: 1.0, alpha: 0.2).cgColor
            let color2 = UIColor(white: 1.0, alpha: 0.1).cgColor
            let color3 = UIColor.clear.cgColor
            let color4 = UIColor(white: 0.0, alpha: 0.05).cgColor
            gradientLayer.colors = [color1,color2,color3,color4]
            gradientLayer.locations = [0.0,0.04,0.95,0]
            layer.insertSublayer(gradientLayer, at: 0)
        }
        
        required init?(coder aDecoder: NSCoder) {
            fatalError("init(coder:) has not been implemented")
        }
        
        override func layoutSubviews() {
            super.layoutSubviews()
            gradientLayer.frame = self.bounds
        }
    
    }
    

    ViewController.swift

    
    import UIKit
    
    let YHRect = UIScreen.main.bounds
    let YHHeight = YHRect.size.height
    let YHWidth = YHRect.size.width
    
    class ViewController: UIViewController {
        
        
        let tableData = ["Read 3 article on Medium", "Cleanup bedroom", "Go for a run", "Hit the gym", "Build another swift project", "Movement training", "Fix the layout problem of a client project", "Write the experience of #30daysSwift", "Inbox Zero", "Booking the ticket to Chengdu", "Test the Adobe Project Comet", "Hop on a call to mom", "Movement training", "Fix the layout problem of a client project", "Write the experience of #30daysSwift", "Inbox Zero", "Booking the ticket to Chengdu", "Test the Adobe Project Comet", "Hop on a call to mom"]
        let tableView = UITableView(frame: YHRect, style: .plain)
        let reuseIdentifier = "CustomCell"
        
        
        override var prefersStatusBarHidden: Bool {
            return true
        }
        override func viewDidLoad() {
            super.viewDidLoad()
            setupView()
        }
        override func viewWillAppear(_ animated: Bool) {
            animateTable()
        }
        override func didReceiveMemoryWarning() {
            super.didReceiveMemoryWarning()
        }
    
        
        func setupView() {
            tableView.separatorStyle = .none
            tableView.delegate = self
            tableView.dataSource = self
            tableView.tableFooterView = UIView()
            tableView.register(CustomTableViewCell.self, forCellReuseIdentifier: reuseIdentifier)
            view.addSubview(tableView)
        }
        func animateTable() {
            tableView.reloadData()
            //所有可见的cell
            let cells = tableView.visibleCells
            let tableHeight = tableView.bounds.size.height
            
            for (index,cell) in cells.enumerated() {
                cell.transform = CGAffineTransform(translationX: 0, y: tableHeight)
                UIView.animate(withDuration: 1.0,
                               delay: 0.05*Double(index),
                               usingSpringWithDamping: 0.8,
                               initialSpringVelocity: 0,
                               options: [],
                               animations: {
                    cell.transform = CGAffineTransform(translationX: 0, y: 0)
                    },
                               completion: nil)
            }
        }
        func colorforIndex(index: Int) -> UIColor {
            let itemCount = tableData.count-1
            let color = (CGFloat(index)/CGFloat(itemCount))*0.6
            return UIColor(red: 1.0, green: color, blue: 0.0, alpha: 1.0)
        }
    
    }
    
    
    extension ViewController:UITableViewDataSource, UITableViewDelegate {
        //MARK: - DataSource
        func numberOfSections(in tableView: UITableView) -> Int {
            return 1
        }
        func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
            return tableData.count
        }
        func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
            let cell = tableView.dequeueReusableCell(withIdentifier: reuseIdentifier, for: indexPath)
            cell.textLabel?.text = tableData[indexPath.row]
            cell.textLabel?.textColor = .white
            cell.textLabel?.backgroundColor = .clear
            cell.textLabel?.font = UIFont(name: "Avenir Next", size: 18)
            cell.selectionStyle = .gray
            return cell
        }
        
        //MARK: - Delegate
        func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
            return 50
        }
        func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
            tableView.deselectRow(at: indexPath, animated: true)
        }
        func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
            cell.backgroundColor = colorforIndex(index: indexPath.row)
        }
    }
    
    

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