/* 浏览作品view*/import UIKit/***  图片浏览器(大图和缩略图)*/
class JYBrowseWorksView: UIView {/// 数据源参数（外界传入）var dataArray:[WorkImagesProtocol] = [] {didSet{self.topCollectionView.reloadData()self.bottomCollectionView.reloadData()if dataArray.isEmpty {self.topCollectionView.backgroundView = self.emptyViewbottomCollectHeight?.constant = 0self.topCollectionView.backgroundColor = UIColor(hexColor: "F9F9F9")}else{self.topCollectionView.backgroundView = nilbottomCollectHeight?.constant = 70self.topCollectionView.backgroundColor = UIColor.white}}}/// 照片比例类型(默认1:1)var photoSizeType: JYMyCenterPhotoHeightType = .squareType {didSet{self.collectionHeightConstraint?.constant = photoSizeType.photoHeightif photoSizeType == .rectangleType {self.collectionMegrainConstraint?.constant = 72}else {self.collectionMegrainConstraint?.constant = 24}}}/// 当前显示的图片索引private var selectIndex:Int = 0 {didSet{self.reloadCollectionUI()}}/// 空页面private let emptyView = JYZDEmptyView(emptyAreement: JYEmptyViewStruct(emptyType: .noImageEmptyType, offsetY: -70, titleTipStr: "暂无作品", buttonTitleStr: nil))/// 底部相册的高度约束private var bottomCollectHeight: NSLayoutConstraint?/// 可分页滑动collectionViewprivate lazy var topCollectionView : UICollectionView = {let layout = UICollectionViewFlowLayout()layout.scrollDirection = .horizontallayout.itemSize = CGSize(width: JY_DEVICE_WIDTH, height: self.photoSizeType.photoHeight)let collectionView = UICollectionView(frame: .zero, collectionViewLayout: layout)collectionView.translatesAutoresizingMaskIntoConstraints = falsecollectionView.backgroundColor = UIColor.whitecollectionView.isPagingEnabled = truecollectionView.showsVerticalScrollIndicator = falsecollectionView.showsHorizontalScrollIndicator = falsereturn collectionView}()/// 可选择点中的collectionviewprivate var bottomCollectionView : UICollectionView = {let layout = UICollectionViewFlowLayout()layout.scrollDirection = .horizontallayout.itemSize = CGSize(width: 70, height: 70)let collectionView = UICollectionView(frame: .zero, collectionViewLayout: layout)collectionView.translatesAutoresizingMaskIntoConstraints = falsecollectionView.backgroundColor = UIColor.whitecollectionView.showsVerticalScrollIndicator = falsecollectionView.showsHorizontalScrollIndicator = falsereturn collectionView}()/// topcollectionView 开始滑动时的位移private var startContentOffsetX : CGFloat = 0/// topcollectionView 将要停止滑动时的位移private var willEndContentOffsetX : CGFloat = 0/// 控制高度的约束private var collectionHeightConstraint: NSLayoutConstraint?/// 控制距离的约束private var collectionMegrainConstraint: NSLayoutConstraint?override init(frame: CGRect) {super.init(frame: frame)self.translatesAutoresizingMaskIntoConstraints = falseself.configerUI()}required init?(coder aDecoder: NSCoder) {fatalError("init(coder:) has not been implemented")}/// 刷新collectionview的UIprivate func reloadCollectionUI() {let endContentOffsetX = topCollectionView.contentOffset.xif endContentOffsetX < willEndContentOffsetX , willEndContentOffsetX < startContentOffsetX {DDLOG(message: "左移")if !bottomCollectionView.indexPathsForVisibleItems.contains(IndexPath(item: selectIndex, section: 0)) {bottomCollectionView.selectItem(at: IndexPath(item: selectIndex, section: 0), animated: true, scrollPosition: UICollectionView.ScrollPosition.left)}} else if endContentOffsetX > willEndContentOffsetX , willEndContentOffsetX > startContentOffsetX {DDLOG(message: "右移")if !bottomCollectionView.indexPathsForVisibleItems.contains(IndexPath(item: selectIndex, section: 0)) {bottomCollectionView.selectItem(at: IndexPath(item: selectIndex, section: 0), animated: true, scrollPosition: UICollectionView.ScrollPosition.right)}}self.bottomCollectionView.reloadData()}
}// MARK: - UICollectionViewDelegate,UICollectionViewDataSource,UICollectionViewDelegateFlowLayout
extension JYBrowseWorksView : UICollectionViewDelegate,UICollectionViewDataSource,UICollectionViewDelegateFlowLayout {func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {return self.dataArray.count}func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "JYBrowseWorksCollectionCell", for: indexPath) as! JYBrowseWorksCollectionCellcell.configerCellData(imageData: dataArray[indexPath.row])if collectionView == bottomCollectionView {let select = selectIndex == indexPath.row ? true : falsecell.configerSelectCell(isSelect: select)}else {
//            cell.imageView.contentMode = .scaleAspectFit
//            cell.clipsToBounds = false}return cell}func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {if collectionView == topCollectionView {return 0.0001}return 10}func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {if collectionView == topCollectionView {return 0}return 10}func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {if collectionView == topCollectionView {return UIEdgeInsets.zero}return UIEdgeInsets(top: 0, left: 10, bottom: 0, right: 10)}func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {if collectionView == bottomCollectionView {selectIndex = indexPath.rowtopCollectionView.scrollToItem(at: IndexPath(item: indexPath.row, section: 0), at: UICollectionView.ScrollPosition.left, animated: true)}}/// 滑动顶部collectionview，底部collectionview显示顶部当前显示的图片////// - Parameter scrollView: scrollView descriptionfunc scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {if scrollView == topCollectionView {let x = scrollView.contentOffset.xlet i:Int = Int(x/UIScreen.main.bounds.size.width)self.selectIndex = i}}/// 获取将要滑动时位移/// 用于判断滑动方向/// - Parameter scrollView: scrollView descriptionfunc scrollViewWillBeginDragging(_ scrollView: UIScrollView) {if scrollView == topCollectionView {startContentOffsetX = scrollView.contentOffset.x}}/// 获取将要结束时 topCollectionView 的位移///  用于判断 滑动方向/// - Parameters:///   - scrollView: scrollView description///   - velocity: velocity description///   - targetContentOffset: targetContentOffset descriptionfunc scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {if scrollView == topCollectionView {willEndContentOffsetX = scrollView.contentOffset.x}}
}// MARK: - UI布局
extension JYBrowseWorksView {private func configerUI() {topCollectionView.delegate = selftopCollectionView.dataSource  = selfbottomCollectionView.delegate = selfbottomCollectionView.dataSource = selftopCollectionView.register(JYBrowseWorksCollectionCell.classForCoder(), forCellWithReuseIdentifier: "JYBrowseWorksCollectionCell")bottomCollectionView.register(JYBrowseWorksCollectionCell.classForCoder(), forCellWithReuseIdentifier: "JYBrowseWorksCollectionCell")self.addSubview(topCollectionView)self.addSubview(bottomCollectionView)let vd:[String:UIView] = ["topCollectionView":topCollectionView,"bottomCollectionView":bottomCollectionView]self.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "|[topCollectionView]|", options: [], metrics: nil, views: vd))self.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "|[bottomCollectionView]|", options: [], metrics: nil, views: vd))self.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|[topCollectionView]", options: [], metrics: nil, views: vd))self.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:[bottomCollectionView]|", options: [], metrics: nil, views: vd))self.collectionHeightConstraint = topCollectionView.heightAnchor.constraint(equalToConstant: JY_DEVICE_WIDTH)self.collectionHeightConstraint?.isActive = trueself.collectionMegrainConstraint = bottomCollectionView.topAnchor.constraint(equalTo: topCollectionView.bottomAnchor, constant: 24)self.collectionMegrainConstraint?.isActive = truebottomCollectHeight = bottomCollectionView.heightAnchor.constraint(equalToConstant: 70)bottomCollectHeight?.isActive = true}
}