Swift - 多列表格组件的实现（样例1：基本功能的实现）

import Foundation
import UIKit

//多列表格组件（通过CollectionView实现）
class UICollectionGridViewController: UICollectionViewController {
    //表头数据
    var cols: [String]! = []
    //行数据
    var rows: [[Any]]! = []
    //单元格内容居左时的左侧内边距
    private var cellPaddingLeft:CGFloat = 5
    
    init() {
        //初始化表格布局
        let layout = UICollectionGridViewLayout()
        super.init(collectionViewLayout: layout)
        layout.viewController = self
        collectionView!.backgroundColor = UIColor.white
        collectionView!.register(UICollectionGridViewCell.self,
                                      forCellWithReuseIdentifier: "cell")
        collectionView!.delegate = self
        collectionView!.dataSource = self
        collectionView!.isDirectionalLockEnabled = true
        collectionView!.contentInset = UIEdgeInsetsMake(0, 10, 0, 10)
        collectionView!.bounces = false
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("UICollectionGridViewController.init(coder:) has not been implemented")
    }
    
    //设置列头数据
    func setColumns(columns: [String]) {
        cols = columns
    }
    
    //添加行数据
    func addRow(row: [Any]) {
        rows.append(row)
        collectionView!.collectionViewLayout.invalidateLayout()
        collectionView!.reloadData()
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
    }
    
    override func viewDidLayoutSubviews() {
        collectionView!.frame = CGRect(x:0, y:0,
                                width:view.frame.width, height:view.frame.height)
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
    
    //返回表格总行数
    override func numberOfSections(in collectionView: UICollectionView) -> Int {
            if cols.isEmpty {
                return 0
            }
            //总行数是：记录数＋1个表头
            return rows.count + 1
    }
    
    //返回表格的列数
    override func collectionView(_ collectionView: UICollectionView,
                                 numberOfItemsInSection section: Int) -> Int {
        return cols.count
    }
    
    //单元格内容创建
    override func collectionView(_ collectionView: UICollectionView,
                   cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell",
                                    for: indexPath) as! UICollectionGridViewCell
        //第一列的内容左对齐，其它列内容居中
        if indexPath.row == 0 {
            cell.label.textAlignment = .left
            cell.paddingLeft = cellPaddingLeft
        }
        
        //设置列头单元格，内容单元格的数据
        if indexPath.section == 0 {
            let text = NSAttributedString(string: cols[indexPath.row], attributes: [
                NSFontAttributeName:UIFont.boldSystemFont(ofSize: 15)
                ])
            cell.label.attributedText = text
        } else {
            cell.label.font = UIFont.systemFont(ofSize: 15)
            cell.label.text = "\(rows[indexPath.section-1][indexPath.row])"
        }
        
        return cell
    }
    
    //单元格选中事件
    override func collectionView(_ collectionView: UICollectionView,
                                 didSelectItemAt indexPath: IndexPath) {
        //打印出点击单元格的［行,列］坐标
        print("点击单元格的[行,列]坐标: [\(indexPath.section),\(indexPath.row)]")
    }
}

import UIKit

class UICollectionGridViewCell: UICollectionViewCell {
    
    //内容标签
    var label:UILabel!
    
    //标签做边距
    var paddingLeft:CGFloat = 0
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        //单元格边框
        self.layer.borderWidth = 1
        self.backgroundColor = UIColor.white
        self.clipsToBounds = true
        
        //添加内容标签
        self.label = UILabel(frame: .zero)
        self.label.textAlignment = .center
        self.addSubview(self.label)
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    override func layoutSubviews() {
        super.layoutSubviews()
        label.frame = CGRect(x: paddingLeft, y: 0,
                             width: frame.width - paddingLeft,
                             height: frame.height)
    }
}

import Foundation
import UIKit

//多列表格组件布局类
class UICollectionGridViewLayout: UICollectionViewLayout {
    //记录每个单元格的布局属性
    private var itemAttributes: [[UICollectionViewLayoutAttributes]] = []
    private var itemsSize: [NSValue] = []
    private var contentSize: CGSize = CGSize.zero
    //表格组件视图控制器
    var viewController: UICollectionGridViewController!
    
    //准备所有view的layoutAttribute信息
    override func prepare() {
        if collectionView!.numberOfSections == 0 {
            return
        }
        
        var column = 0
        var xOffset: CGFloat = 0
        var yOffset: CGFloat = 0
        var contentWidth: CGFloat = 0
        var contentHeight: CGFloat = 0
        
        if itemAttributes.count > 0 {
            return
        }
        
        itemAttributes = []
        itemsSize = []
        
        if itemsSize.count != viewController.cols.count {
            calculateItemsSize()
        }
        
        for section in 0 ..< (collectionView?.numberOfSections)! {
            var sectionAttributes: [UICollectionViewLayoutAttributes] = []
            for index in 0 ..< viewController.cols.count {
                let itemSize = itemsSize[index].cgSizeValue
                
                let indexPath = IndexPath(item: index, section: section)
                let attributes = UICollectionViewLayoutAttributes(forCellWith: indexPath)
                //除第一列，其它列位置都左移一个像素，防止左右单元格间显示两条边框线
                if index == 0{
                    attributes.frame = CGRect(x:xOffset, y:yOffset, width:itemSize.width,
                                              height:itemSize.height).integral
                }else {
                    attributes.frame = CGRect(x:xOffset-1, y:yOffset,
                                              width:itemSize.width+1,
                                              height:itemSize.height).integral
                }
                
                sectionAttributes.append(attributes)
                
                xOffset = xOffset+itemSize.width
                column += 1
                
                if column == viewController.cols.count {
                    if xOffset > contentWidth {
                        contentWidth = xOffset
                    }
                    
                    column = 0
                    xOffset = 0
                    yOffset += itemSize.height
                }
            }
            itemAttributes.append(sectionAttributes)
        }
        
        let attributes = itemAttributes.last!.last! as UICollectionViewLayoutAttributes
        contentHeight = attributes.frame.origin.y + attributes.frame.size.height
        contentSize = CGSize(width:contentWidth, height:contentHeight)
    }
    
    //需要更新layout时调用
    override func invalidateLayout() {
        itemAttributes = []
        itemsSize = []
        contentSize = CGSize.zero
        super.invalidateLayout()
    }
    
    // 返回内容区域总大小，不是可见区域
    override var collectionViewContentSize: CGSize {
        get {
            return contentSize
        }
    }
    
    // 这个方法返回每个单元格的位置和大小
    override func layoutAttributesForItem(at indexPath: IndexPath)
        -> UICollectionViewLayoutAttributes? {
        return itemAttributes[indexPath.section][indexPath.row]
    }
    
    // 返回所有单元格位置属性
    override func layoutAttributesForElements(in rect: CGRect)
        -> [UICollectionViewLayoutAttributes]? {
            var attributes: [UICollectionViewLayoutAttributes] = []
            for section in itemAttributes {
                attributes.append(contentsOf: section.filter(
                    {(includeElement: UICollectionViewLayoutAttributes) -> Bool in
                        return rect.intersects(includeElement.frame)
                }))
            }
            return attributes
    }
    
    //当边界发生改变时，是否应该刷新布局。
    //本例在宽度变化时，将重新计算需要的布局信息。
    override func shouldInvalidateLayout(forBoundsChange newBounds: CGRect) -> Bool {
        let oldBounds = self.collectionView?.bounds
        if oldBounds!.width != newBounds.width {
            return true
        }else {
            return false
        }
    }
    
    //计算所有单元格的尺寸（每一列各一个单元格）
    func calculateItemsSize() {
        var remainingWidth = collectionView!.frame.width -
            collectionView!.contentInset.left - collectionView!.contentInset.right
        
        var index = viewController.cols.count-1
        while index >= 0 {
            let newItemSize = sizeForItemWithColumnIndex(columnIndex: index,
                                                         remainingWidth: remainingWidth)
            remainingWidth -= newItemSize.width
            let newItemSizeValue = NSValue(cgSize: newItemSize)
            //由于遍历列的时候是从尾部开始遍历了，因此将结果插入数组的时候都是放人第一个位置
            itemsSize.insert(newItemSizeValue, at: 0)
            index -= 1
        }
    }
    
    //计算某一列的单元格尺寸
    func sizeForItemWithColumnIndex(columnIndex: Int, remainingWidth: CGFloat) -> CGSize {
        let columnString = viewController.cols[columnIndex]
        //根据列头标题文件，估算各列的宽度
        let size = NSString(string: columnString).size(attributes: [
            NSFontAttributeName:UIFont.systemFont(ofSize: 15),
            NSUnderlineStyleAttributeName:NSUnderlineStyle.styleSingle.rawValue
            ])
        
        //如果有剩余的空间则都给第一列
        if columnIndex == 0 {
            return CGSize(width:max(remainingWidth, size.width + 17),
                          height:size.height + 10)
        }
        //行高增加10像素，列宽增加17像素
        return CGSize(width:size.width + 17, height:size.height + 10)
    }
}

import UIKit

class ViewController: UIViewController {
    
    var gridViewController: UICollectionGridViewController!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        gridViewController = UICollectionGridViewController()
        gridViewController.setColumns(columns: ["客户", "消费金额", "消费次数", "满意度"])
        gridViewController.addRow(row: ["hangge", "100", "8", "60%"])
        gridViewController.addRow(row: ["张三", "223", "16", "81%"])
        gridViewController.addRow(row: ["李四", "143", "25", "93%"])
        gridViewController.addRow(row: ["王五", "75", "2", "53%"])
        gridViewController.addRow(row: ["韩梅梅", "43", "12", "33%"])
        gridViewController.addRow(row: ["李雷", "33", "27", "45%"])
        gridViewController.addRow(row: ["王大力", "33", "22", "15%"])
        view.addSubview(gridViewController.view)
    }
    
    override func viewDidLayoutSubviews() {
        gridViewController.view.frame = CGRect(x:0, y:50, width:view.frame.width,
                                               height:view.frame.height-60)
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }   
}

5，源码下载：hangge_1081.zip

样式修改1：每列宽度相等、内容居中

样式修改2：每列设置个最小宽度

前面的样例中我们都是让所有列能在同一屏下全部显示出来，如果表格列数过多，在竖屏下就会显得比较拥挤。

可以修改 UICollectionGridViewLayout 类里的 sizeForItemWithColumnIndex 方法，将列宽限定个最小值。

//计算某一列的单元格尺寸
func sizeForItemWithColumnIndex(columnIndex: Int, remainingWidth: CGFloat) -> CGSize {
    let columnString = viewController.cols[columnIndex]
    //根据列头标题文件，估算各列的宽度
    let size = NSString(string: columnString).size(attributes: [
        NSFontAttributeName:UIFont.systemFont(ofSize: 15),
        NSUnderlineStyleAttributeName:NSUnderlineStyle.styleSingle.rawValue
        ])
    
    //修改成所有列都平均分配（但宽度不能小于80）
    let width = max(remainingWidth/CGFloat(columnIndex+1), 80)
    //计算好的宽度还要取整，避免偏移
    return CGSize(width: ceil(width), height:size.height + 10)
}

这里我将最小值设为80，超出屏幕往外的区域可以通过左右拖动查看。