实现侧边栏滑动

'''
class TestViewController: ViewController ,UIGestureRecognizerDelegate {

var viewModel = NewsViewModel<NewsPageModel>(service: NewsRecordService())
var items = [NewsPageModel.T]()

let leftView = UIView()

var isOpen = false

private let headerRefreshTrigger = PublishSubject<Void>()
private let footerRefreshTrigger = PublishSubject<Void>()
private let normalRefreshTrigger = SubscribeManager.shared.NewsRefreshTrigger
private let emptyRefreshTrigger = PublishRelay<Void>()
private let uiChangePublish = PublishSubject<Void>()

var itemWitdh:CGFloat = 432
var minLimiteWitdh:CGFloat = 360
var currentWitdh:CGFloat = 0.0

private lazy var collectionView: UICollectionView = {
    
    let layout = UICollectionViewFlowLayout()
    layout.minimumInteritemSpacing = 16
    layout.minimumLineSpacing = 16
    layout.sectionInset = UIEdgeInsets(top: 20, left: 18, bottom: 20, right: 18)
    layout.itemSize = CGSize(width: UIDevice.caculateWitdh(maign: 18, space: 16, itemWitdh: 432, totalWitdh: view.width), height: 148)
    layout.scrollDirection = .horizontal
    
    
    let collectionView = UICollectionView(frame: .zero, collectionViewLayout: layout)
    collectionView.backgroundColor = .clear
    collectionView.showsHorizontalScrollIndicator = false
    collectionView.isScrollEnabled = true
    collectionView.delegate = self
    if #available(iOS 11, *) {
        collectionView.contentInsetAdjustmentBehavior = .never
    }
    collectionView.register(cellType: NewsCollectCell.self)
    collectionView.mj_header = RefreshHeader(refreshingBlock: {[weak self] in
        guard let self = self else { return }
        self.headerRefreshTrigger.onNext(())
    })
    collectionView.mj_footer = RefreshFooter(refreshingBlock: {[weak self] in
        guard let self = self else { return }
        self.footerRefreshTrigger.onNext(())
    })
    
    return collectionView
}()

override func viewDidLoad() {
    super.viewDidLoad()

    hbd_barHidden = true
    setupUI()
    setupBinding()

}

func freshData() {
    self.normalRefreshTrigger.onNext(())
}

func setupUI() {
     
    view.backgroundColor = .init(hex: "#F5F6F9")
    view.addSubview(collectionView)
    collectionView.snp.makeConstraints { make in
        make.left.top.right.equalToSuperview().offset(0)
        make.bottom.equalTo(view.snp_bottomMargin).offset(0)
    }
    
    view.addSubview(leftView)
    leftView.backgroundColor = .greenColor
    leftView.snp.makeConstraints { make in
        make.top.equalToSuperview().offset(0)
        make.bottom.equalTo(view.snp_bottomMargin).offset(0)
        make.left.equalToSuperview().offset(-200)
        make.width.equalTo(200)
    }
    
    
    let pan = UIPanGestureRecognizer.init(target: self, action: #selector(panGes))
    pan.delegate = self
    self.view.addGestureRecognizer(pan)

}

func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
    if gestureRecognizer.view?.isDescendant(of: collectionView) == true {
            return false
    }
    if gestureRecognizer is UIScreenEdgePanGestureRecognizer {
        return false
    }else{
        let xx = gestureRecognizer.location(in: view).x
        if !isOpen {
            if xx < 100 {
                return true
            }
        }else{
            if xx > 200 {
                return true
            }
        }
    }

    return false
    
}

@objc
func  panGes(ges:UIPanGestureRecognizer) {
    
    var  xx = ges.translation(in: ges.view).x
    print("x=====\(xx)")

    switch ges.state {
    case .began:
    break
    case .changed :
        if !isOpen {
            if xx > 0 {
                if xx > 200 {
                    xx = 200
                }
                leftView.snp.updateConstraints { make in
                    make.left.equalToSuperview().offset(-200 + xx)
                }
            }

        }else{
            if xx < 0 {
                if xx < -200 {
                    xx = -200
                }
                leftView.snp.updateConstraints { make in
                    make.left.equalToSuperview().offset(xx)
                }
            }

        }
        
    default:

        if isOpen {
            if xx < -50 {
                UIView.animate(withDuration: 0.25) {
                    self.leftView.snp.updateConstraints { make in
                        make.left.equalToSuperview().offset(-200)
                    }
                } completion: { complete in
                    self.isOpen =  false
                }
            }

        }else{
            
            if xx > 50 {
                UIView.animate(withDuration: 0.25) {
                    self.leftView.snp.updateConstraints { make in
                        make.left.equalToSuperview().offset(0)
                    }
                } completion: { complete in
                    self.isOpen =  true
                }
            }
            
        }

    }
    
}

'''