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)
    }
}