UICollectionView swift2模版

class testViewController:BaseViewController,UICollectionViewDataSource, UICollectionViewDelegate , UICollectionViewDelegateFlowLayout{
    lazy var myCollectionView:UICollectionView = {
        let layout = UICollectionViewFlowLayout()
        layout.minimumLineSpacing = 1.5  //上下间隔
        layout.minimumInteritemSpacing = 1 //左右间隔
        let collectionView = UICollectionView(frame: CGRectZero, collectionViewLayout:layout)
        collectionView.backgroundColor = UIColor.whiteColor()
        return collectionView
    }()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        //加载页面元素
        self.addSubView()
        self.makeConstraints()
        self.myCollectionView.reloadData()
    }
    
    func addSubView(){
        self.view.backgroundColor = UIColor(rgba: "#F1F1F1")
        self.myCollectionView.delegate = self
        self.myCollectionView.dataSource = self
        
        //注册header
        self.myCollectionView.registerClass(UICollectionReusableView.self, forSupplementaryViewOfKind: UICollectionElementKindSectionHeader, withReuseIdentifier: "TESTHeader")
        
        self.myCollectionView.registerClass(UICollectionViewCell.self, forCellWithReuseIdentifier: "TESTCell")
        self.view.addSubview(myCollectionView)
    }
    
    //增加约束
    func makeConstraints(){
        //Add Constraints
        myCollectionView.snp_makeConstraints{make in
            make.top.bottom.left.right.equalTo(self.view)
        }
    }
    
    //MARK: - CollectionView 代理方法
    func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {
        //分栏数量
        return 10
    }
    
    func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        //每个分栏中Cell的个数
        return 2
    }
    
    func collectionView(collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, atIndexPath indexPath: NSIndexPath) -> UICollectionReusableView {
        var reuseView:UICollectionReusableView
        reuseView = collectionView.dequeueReusableSupplementaryViewOfKind(UICollectionElementKindSectionHeader, withReuseIdentifier: "TESTHeader", forIndexPath: indexPath)
        reuseView.backgroundColor = UIColor.blackColor()
        return reuseView
    }
    
    ///cell内容
    func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
        //返回复用的cell
        var cell = collectionView.dequeueReusableCellWithReuseIdentifier("TESTCell", forIndexPath: indexPath)
        if indexPath.row % 2 == 0 {
            cell.backgroundColor = UIColor.redColor()
        }else{
            cell.backgroundColor = UIColor.blueColor()
        }
        return cell
    }
    
    func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
        //返回每个cell的大小
        return CGSize( KMainScreenWidth, height:150)
    }
    
    func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForFooterInSection section: Int) -> CGSize {
        var h:CGFloat = 15
        return CGSizeMake(KMainScreenWidth,h)
    }
    
    func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForHeaderInSection section: Int) -> CGSize {
        //返回sectionview的大小
        var h:CGFloat = 50
        return CGSizeMake(KMainScreenWidth,h)
    }
    
    func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAtIndex section: Int) -> UIEdgeInsets{
        return UIEdgeInsets(top:0, left: 0, bottom:5, right: 0)
    }
    
    func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
        //Cell点击事件
    }
}