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class AmuseViewController: BaseAnchorViewController {
private lazy var amuseMenuView:JFAmuseMenuView = {
let view = JFAmuseMenuView.amuseMenuView()
view.frame = CGRect(x: 0, y: -kTopHeaderViewH, width: kScreenWidth, height: kTopHeaderViewH)
return view
}()
private lazy var amuseViewModel:JFAmuseViewModel = JFAmuseViewModel()
//Overriding non-@objc declarations from extensions is not supported
// 原因： 不支持从扩展中覆盖non-@objc声明
// 解决：将方法写到主类
override func setupUI() {
super.setupUI()
collectionView.addSubview(amuseMenuView)
//经常使用 高度随着父控件的拉伸而拉伸。
// collectionView.autoresizingMask = [.flexibleHeight,.flexibleWidth]
collectionView.contentInset = UIEdgeInsets(top:kTopHeaderViewH , left: 0, bottom: 0, right: 0)
}
override func loadData() {
//给父类的 baseVM 赋值
baseVM = amuseViewModel
//请求数据
amuseViewModel.requestAmuseData {
self.collectionView.reloadData()
var tmpGroups = self.amuseViewModel.anchorGroups
tmpGroups.removeFirst()
self.amuseMenuView.groups = tmpGroups
//数据请求完成
self.loadDataFinished()
}
}
//
// //对父类的 cell大小布局 重写
// override func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize{
// return CGSize(width: kItemW, height: kNormalItemH)
// }
}
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private let JFMenuID:String = "JFMenuID"
class JFAmuseMenuView: UIView {
//定义属性
var groups : [AnchorGroup]?{
didSet{
collectionView.reloadData()
}
}
@IBOutlet weak var collectionView: UICollectionView!
@IBOutlet weak var pageController: UIPageControl!
override func awakeFromNib() {
super.awakeFromNib()
//经常使用 高度随着父控件的拉伸而拉伸。
// collectionView.autoresizingMask = [.flexibleHeight,.flexibleWidth]
//不随着父控件的拉伸而拉伸
autoresizingMask = UIView.AutoresizingMask()
collectionView.dataSource = self
collectionView.delegate = self
// collectionView.register(UICollectionViewCell.self, forCellWithReuseIdentifier: JFAmuseMenuViewCellID)
collectionView.register(UINib(nibName: "JFAmuseMenuViewCell", bundle: nil), forCellWithReuseIdentifier: JFMenuID)
}
override func layoutSubviews() {
super.layoutSubviews()
let collectionViewLayout = collectionView.collectionViewLayout as! UICollectionViewFlowLayout
collectionViewLayout.itemSize = collectionView.bounds.size
}
}
extension JFAmuseMenuView{
class func amuseMenuView() -> JFAmuseMenuView {
return Bundle.main.loadNibNamed("JFAmuseMenuView", owner: nil, options: nil)?.first as! JFAmuseMenuView
}
}
extension JFAmuseMenuView:UICollectionViewDataSource{
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
if groups == nil { return 0 }
//计算多少页的算法
let pageNum = (groups!.count - 1) / 8 + 1
pageController.numberOfPages = pageNum
return pageNum
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: JFMenuID, for: indexPath) as! JFAmuseMenuViewCell
setCellDataWithCell(cell: cell, indexPath: indexPath)
return cell
}
private func setCellDataWithCell(cell:JFAmuseMenuViewCell,indexPath:IndexPath){
// 0-7
// 8-15
// 15-23
let startIndex = indexPath.item * 8
var endIndex = (indexPath.item + 1) * 8 - 1
//判断越界问题 Change 'let' to 'var' to make it mutable 这个地方 endIndex是可变的 用var
// 运算符号 要加空格
if endIndex > groups!.count - 1 {
endIndex = groups!.count - 1
}
//取出数据 再组装成一个数组
cell.groups = Array(groups![startIndex...endIndex])
}
}
extension JFAmuseMenuView : UICollectionViewDelegate{
func scrollViewDidScroll(_ scrollView: UIScrollView) {
pageController.currentPage = Int(scrollView.contentOffset.x / scrollView.bounds.width)
}
}
UIView上添加UICollectionView
class JFAmuseMenuViewCell: UICollectionViewCell {
var groups:[AnchorGroup]?{
didSet{
collectionView.reloadData()
}
}
@IBOutlet weak var collectionView: UICollectionView!
override func awakeFromNib() {
super.awakeFromNib()
collectionView.dataSource = self
collectionView.register(UINib(nibName: "JFCollectionGameCell", bundle: nil), forCellWithReuseIdentifier:JFGameCellID )
}
override func layoutSubviews() {
super.layoutSubviews()
let collectionViewLayout = collectionView.collectionViewLayout as! UICollectionViewFlowLayout
let itemW = contentView.bounds.width / 4
let itemH = contentView.bounds.height / 2
collectionViewLayout.itemSize = CGSize(width: itemW, height: itemH)
}
}
extension JFAmuseMenuViewCell : UICollectionViewDataSource{
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return groups?.count ?? 0
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: JFGameCellID, for: indexPath) as! JFCollectionGameCell
//超出部分不展示
cell.clipsToBounds = true
cell.baseGame = groups![indexPath.item]
return cell
}
}
UICollevtionView 的cell里面又嵌套 UICollevtionView
类的属性
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计算属性的完整写法
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类属性的监听
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属性发生改变
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private let kItemMargin:CGFloat = 10
private let kItemW:CGFloat = (kScreenWidth - kItemMargin * 3)/2
private let kNormalItemH:CGFloat = kItemW * 3 / 4
class FunnyViewController: BaseAnchorViewController {
private lazy var funnyVM:JFFunnyViewModel = JFFunnyViewModel()
override func loadData() {
baseVM = funnyVM
funnyVM.loadFunnyData {
self.collectionView.reloadData()
//数据请求完成
self.loadDataFinished()
}
}
override func setupUI() {
super.setupUI()
let layout = collectionView.collectionViewLayout as! UICollectionViewFlowLayout
layout.headerReferenceSize = CGSize.zero
collectionView.contentInset = UIEdgeInsets(top: 10, left: 0, bottom: 0, right: 0)
}
}
重写父类的方法
UI布局全是在父类实现的，所有只要实现这个类的数据请求即可。
本期分享的内容很简单比较适合初学者看看。
源码地址已经在
JFDouYu-Swift(二中已经贴出来了) 再会。
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