Xcode8+Swift3 纯代码模式实现 UICollectionView

import UIKit;

class HomeCollectionViewCell: UICollectionViewCell {
    
    var title: UILabel?;   // 单元格中的内容，如需其它控件，可自行添加
    
    override init(frame: CGRect) {
        super.init(frame: frame);
        
        // 将 title 注册到单元格
        title = UILabel(frame: CGRect(x: 30, y: 0, width: UIScreen.main.bounds.width, height: 50));
        title?.textColor = UIColor.black;
        self.addSubview(title!);
        
        self.backgroundColor = UIColor.blue;   // 设置整个单元格背景颜色，测试单元格大小
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("Cell 初始化失败");
    }
}

 1 import UIKit;
 2 
 3 class HomeNavItemController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout {
 4     
 5     var colView: UICollectionView?;   // 创建一个列表
 6     
 7     // 加载界面
 8     override func viewDidLoad() {
 9         super.viewDidLoad();
10         
11         let layout = UICollectionViewFlowLayout();
12         
13         colView = UICollectionView(frame: CGRect.init(x: 0, y: 0, width: UIScreen.main.bounds.width, height: self.view.bounds.height), collectionViewLayout: layout);
14         
15         colView?.register(HomeCollectionViewCell.self, forCellWithReuseIdentifier: "colCell")
16         
17         colView?.delegate = self;
18         colView?.dataSource = self;
19         colView?.backgroundColor = UIColor.white;
20         
21         layout.itemSize = CGSize(width: 375, height: 300);
22         
23         self.view.addSubview(colView!);
24     }
25     
26     override func didReceiveMemoryWarning() {
27         super.didReceiveMemoryWarning();
28     }
29     
30     // Cell 数量
31     func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
32         return 10;
33     }
34     
35     // Cell 具体内容
36     func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
37         let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "colCell", for: indexPath) as! HomeCollectionViewCell;
38         cell.title!.text = "这里是内容：\(indexPath.row)";
39         return cell;
40     }
41 }