Swift - 使用网格（UICollectionView）进行流布局

（本文代码已升级至Swift5）

一、网格UICollectionView最典型的例子是iBooks。其主要属性如下：

1、layout
该属性表示布局方式，有Flow、Custom两种布局方式。默认是Flow流式布局。
2、Accessories
是否显示页眉和页脚
3、各种尺寸属性
Cell Size：单元格尺寸
Header Size：页眉尺寸
Footer Size：页脚尺寸
Min Spacing：单元格之间间距
Section Insets：格分区上下左右空白区域大小。

二、简单的流布局样例

效果图：

Simulator Screen Shot - iPhone SE (2nd generation) - 2020-06-24 at 13.59.44.png

主要代码：

import UIKit

class ViewController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource
{

    var collectionView: UICollectionView!
    
    var dataSource = [
        ["name":"地址管理","pic":"IQH_mine_address"],
        ["name":"我的收藏","pic":"IQH_mine_myCollection"],
        ["name":"账号信息","pic":"IQH_mine_accountInformation"],
        ["name":"系统设置","pic":"IQH_mine_systemSetting"]
    ]
    
    override func viewDidLoad() {
        super.viewDidLoad()
        /// 设置UI
        setupUI()
    }

    /// 设置UI
    func setupUI()
    {
        let layout = UICollectionViewFlowLayout()
        layout.itemSize = CGSize(width: (self.view.bounds.size.width - 40) / 3, height: (self.view.bounds.size.width - 40) / 3 + 30)
        
        collectionView = UICollectionView(frame: self.view.bounds, collectionViewLayout: layout)
        collectionView.register(collectionViewCell.self, forCellWithReuseIdentifier: "collectionViewCell")
        collectionView.delegate = self
        collectionView.dataSource = self
        collectionView.backgroundColor = UIColor.white
        view.addSubview(collectionView)
    }
    
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return dataSource.count
    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "collectionViewCell", for: indexPath) as! collectionViewCell
        let data = dataSource[indexPath.row]
        cell.imageView.image = UIImage(named: data["pic"] ?? "");
        cell.titleLabel.text = data["name"] ?? ""
        return cell
    }
}

class collectionViewCell: UICollectionViewCell
{
    var titleLabel: UILabel!
    var imageView: UIImageView!
    
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        imageView = UIImageView()
        imageView.frame = CGRect(x: 0, y: 0, width: self.bounds.size.width, height: self.bounds.size.width)
        imageView.contentMode = .scaleAspectFit
        
        titleLabel = UILabel(frame: CGRect(x: 0, y: imageView.frame.origin.y + imageView.frame.size.width + 10, width: self.bounds.size.width, height: 20))
        titleLabel.textAlignment = .center
        
        addSubview(imageView)
        addSubview(titleLabel)
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

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