swift-14collectionView

我以前做的swift笔记, 之前都是整理在onenote上, 最近想到整理出博客. 也方便自己查找, 可以当做自己的一份文档.

import UIKit

class ViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()
        setupUI()
    }

    func setupUI() {
        let flowLayout = UICollectionViewFlowLayout.init()
        flowLayout.itemSize = CGSize(width: 100, height: 100)
        
        let collectionView = UICollectionView.init(frame: view.bounds, collectionViewLayout: flowLayout)
        view.addSubview(collectionView)
        collectionView.register(UICollectionViewCell.self, forCellWithReuseIdentifier: "cellID")
        collectionView.dataSource = self
        collectionView.delegate = self
        
        collectionView.backgroundColor = UIColor.white
        
    }
    
    func numberOfSections(in collectionView: UICollectionView) -> Int {
        return 1
    }

    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return 20
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cellID", for: indexPath)
        cell.backgroundColor = UIColor.blue
        return cell
    }
    
    //移动
    func collectionView(_ collectionView: UICollectionView, moveItemAt sourceIndexPath: IndexPath, to destinationIndexPath: IndexPath) {
        
    }
    
}