手动用swift写的UICollectionView, 还是很酷的~~
MyViewController.swift 文件如下:

//
//  MyViewController.swift
//  MyHelloWorld
//
//  Created by ZhangLiangZhi on 2017/5/6.
//  Copyright © 2017年 xigk. All rights reserved.
//

import UIKit

class MyViewController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout{

    var collectionView:UICollectionView!

    override func viewDidLoad() {
        super.viewDidLoad()

        var layout = UICollectionViewFlowLayout()
        collectionView = UICollectionView(frame: CGRect(), collectionViewLayout: layout)
        self.view.addSubview(collectionView)
        collectionView.snp.makeConstraints { (make) in
            make.width.height.equalTo(self.view)
            make.center.equalTo(self.view)
        }
        collectionView.register(MyCollectionViewCell.self, forCellWithReuseIdentifier: "cell")
        collectionView.delegate = self
        collectionView.dataSource = self
        collectionView.backgroundColor = UIColor.white
        layout.itemSize = CGSize(width: 300, height: 300)
    }

    
    func numberOfSections(in collectionView: UICollectionView) -> Int {
        return 1
    }
    
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return 10
    }
        
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) 
        
        return cell
    }

}

不错不错.
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