Swift3.0 UICollectionView简单使用

Swift3.0后,就很想学习Swift,有兴趣的朋友可以一起相互学习!

//声明两个存放字符串的数组
    var nowClassName = [String]()
    var surplusClassName = [String]()
    
    var collectionView : UICollectionView?
    override func viewDidLoad() {
        super.viewDidLoad()

        self.view.backgroundColor = ColorViewBG
        
        let layout = UICollectionViewFlowLayout()
        layout.itemSize = CGSize(80,height:35)
        //列间距,行间距,偏移
        layout.minimumInteritemSpacing = 15
        layout.minimumLineSpacing = 30
        layout.sectionInset = UIEdgeInsetsMake(10, 10, 10, 10)
        
        collectionView = UICollectionView.init(frame: self.view.bounds, collectionViewLayout: layout)
        collectionView?.delegate = self
        collectionView?.dataSource = self;
        //注册一个cell
        collectionView!.register(HotCell.self, forCellWithReuseIdentifier:"HotCell")
        collectionView?.backgroundColor = ColorViewBG
        self.view.addSubview(collectionView!)
        saveData()
    }

//添加数据
    private func saveData() {
        nowClassName += ["A-1","A-2","A-3","A-4","A-5","A-6","A-7","A-8","A-9","A-10","A-11"]
        surplusClassName += ["B-1","B-2","B-3","B-4","B-5","B-6","B-7","B-8","B-9","B-10","B-11"]
        
    }

 // MARK: 代理
    //每个区的item个数
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        
        if section == 0 {
            return nowClassName.count
        }else {
            return surplusClassName.count
        }
        
    }
    
    //分区个数
    func numberOfSections(in collectionView: UICollectionView) -> Int {
        return 2
    }
    
    //自定义cell
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "HotCell", for: indexPath) as! HotCell
        cell.backgroundColor = UIColor.red
        if indexPath.section == 0 {
            cell.label.text = nowClassName[indexPath.item]
        }else{
            cell.label.text = surplusClassName[indexPath.item]
        }
        return cell
        
        
    }

HotCell 没有用xib 有兴趣的小伙伴可以写下

class HotCell: UICollectionViewCell {
    
    var label = UILabel()
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        label = UILabel.init(frame: self.bounds)
        self.addSubview(label)
        
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
}