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import UIKit
class ViewController: UIViewController {
//普通的flow流式布局
var flowLayout:UICollectionViewFlowLayout!
//自定义的线性布局
var linearLayput:LinearCollectionViewLayout!
var collectionView:UICollectionView!
//重用的单元格的Identifier
let CellIdentifier = "myCell"
//所有书籍数据
var images = ["c#.png", "html.png", "java.png", "js.png", "php.png",
"react.png", "ruby.png", "swift.png", "xcode.png"]
override func viewDidLoad() {
super.viewDidLoad()
//初始化Collection View
initCollectionView()
//注册tap点击事件
let tapRecognizer = UITapGestureRecognizer(target: self,
action: #selector(ViewController.handleTap(_:)))
collectionView.addGestureRecognizer(tapRecognizer)
}
private func initCollectionView() {
//初始化flow布局
flowLayout = UICollectionViewFlowLayout()
flowLayout.itemSize = CGSize(width: 60, height: 60)
flowLayout.sectionInset = UIEdgeInsets(top: 74, left: 0, bottom: 0, right: 0)
//初始化自定义布局
linearLayput = LinearCollectionViewLayout()
//初始化Collection View
collectionView = UICollectionView(frame: view.bounds,
collectionViewLayout: linearLayput)
//Collection View代理设置
collectionView.delegate = self
collectionView.dataSource = self
collectionView.backgroundColor = .white
//注册重用的单元格
let cellXIB = UINib.init(nibName: "MyCollectionViewCell", bundle: Bundle.main)
collectionView.register(cellXIB, forCellWithReuseIdentifier: CellIdentifier)
//将Collection View添加到主视图中
view.addSubview(collectionView)
}
//点击手势响应
func handleTap(_ sender:UITapGestureRecognizer){
if sender.state == UIGestureRecognizerState.ended{
let tapPoint = sender.location(in: self.collectionView)
//点击的是单元格元素
if let indexPath = self.collectionView.indexPathForItem(at: tapPoint) {
//通过performBatchUpdates对collectionView中的元素进行批量的插入，删除，移动等操作
//同时该方法触发collectionView所对应的layout的对应的动画。
self.collectionView.performBatchUpdates({ () -> Void in
self.collectionView.deleteItems(at: [indexPath])
self.images.remove(at: indexPath.row)
}, completion: nil)
}
//点击的是空白位置
else{
//新元素插入的位置（开头）
let index = 0
images.insert("xcode.png", at: index)
self.collectionView.insertItems(at: [IndexPath(item: index, section: 0)])
}
}
}
//切换布局样式
@IBAction func changeLayout(_ sender: Any) {
self.collectionView.collectionViewLayout.invalidateLayout()
//交替切换新布局
let newLayout = collectionView.collectionViewLayout
.isKind(of: LinearCollectionViewLayout.self) ? flowLayout : linearLayput
collectionView.setCollectionViewLayout(newLayout!, animated: true)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
//Collection View数据源协议相关方法
extension ViewController: UICollectionViewDataSource {
//获取分区数
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
//获取每个分区里单元格数量
func collectionView(_ collectionView: UICollectionView,
numberOfItemsInSection section: Int) -> Int {
return images.count
}
//返回每个单元格视图
func collectionView(_ collectionView: UICollectionView,
cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
//获取重用的单元格
let cell = collectionView.dequeueReusableCell(withReuseIdentifier:
CellIdentifier, for: indexPath) as! MyCollectionViewCell
//设置内部显示的图片
cell.imageView.image = UIImage(named: images[indexPath.item])
return cell
}
}
//Collection View样式布局协议相关方法
extension ViewController: UICollectionViewDelegate {
}
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hangge_1602.zip