swift-自定义cell和使用xibCell创建colleti

collection view的简单使用

1.创建collection view

var collection : UICollectionView? = nil

创建collectionview

let layout = UICollectionViewFlowLayout()
self.collection = UICollectionView(frame: CGRect(x: 0, y: 0, width: kScreenWidth, height: kScreenHeight), collectionViewLayout: layout)
self.collection?.delegate = self;
self.collection?.dataSource = self;
self.collection?.backgroundColor = UIColor.white
self.view.addSubview(self.collection!)

这里注意layout的创建，创建错误会出现不走代理的问题

2.声明代理

class BaseViewController: UIViewController,UICollectionViewDelegate,UICollectionViewDataSource,UICollectionViewDelegateFlowLayout

这和OC中不同，直接在class中声明就行

3.常用的方法

// MARK: - collection
    override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return 8
    }
    override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CollectionViewCell", for: indexPath) as! CollectionViewCell
        cell.backgroundColor = UIColor.init(red: CGFloat(arc4random()%255)/255.0, green: CGFloat(arc4random()%255)/255.0, blue: CGFloat(arc4random()%255)/255.0, alpha: 1)
        cell.titleLable.text = "逗比"
        cell.titleView.backgroundColor = UIColor.init(red: CGFloat(arc4random()%255)/255.0, green: CGFloat(arc4random()%255)/255.0, blue: CGFloat(arc4random()%255)/255.0, alpha: 1)
        return cell
    }
    
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        return CGSize(width: CGFloat(kScreenWidth-45)/3.0, height: 50)
    }

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
        return UIEdgeInsetsMake(10, 10, 10, 10)
    }
    
    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        print(indexPath.row)
    }

4.

使用纯代码创建cell

self.collection?.register(TestCollectionViewCell.self, forCellWithReuseIdentifier: "TestCollectionViewCell")

使用xib创建cell

self.collection?.register(UINib(nibName: "CollectionViewCell", bundle: nil), forCellWithReuseIdentifier: "CollectionViewCell")

demo下载