ios-仅当我在箭头上方滑动下一张图片时，屏幕滑动才起作用

点击照片后，我有一个photoview在前台打开照片。照片有一个左右箭头，分别用作下一张和上一张照片。当我使用它们时，这个箭头可以正常工作。当我转到最左边的照片时，左箭头会隐藏起来，当我转到最右边（最后一张）的照片时，右箭头也会隐藏起来。但是当我在照片上使用滑动时，此处理不起作用。箭头仍然存在并且没有隐藏。

所以我做了一个滑动功能，它会像上面一样隐藏箭头。刷卡功能有效，但仅在我刷过箭头而不是照片本身的情况下。当我在箭头上滑动时，照片自然不会移动到下一张......有人可以解释一下我做错了什么吗？

更新可以在照片上滑动，但不调用 gesSwipe()

这是我的 PhotoViewcontroller.swift

import Foundation
import UIKit

struct PhotoParam {
    let urls: [URL]
}

class PhotoViewController: ModalViewController, UIGestureRecognizerDelegate {
    // MARK: properties
    @IBOutlet private weak var imageCollection: UICollectionView!
    @IBOutlet weak var arrowLeftButton: UIButton!
    @IBOutlet weak var arrowRightButton: UIButton!
    
    var urls: [URL] = [] {
        didSet {
            imageCollection?.reloadData()
        }
    }
    
    // MARK: init
    override func initPresenter() {
        
    }
    
    override func setParam(param: Any) {
        guard let param = param as? PhotoParam else {
            return
        }
        
        self.urls = param.urls
    }
    
    
    @IBAction func gesSwipe(_ sender: UISwipeGestureRecognizer) {
        
        let screenW = UIScreen.main.bounds.width
        let offset: CGPoint = imageCollection.contentOffset
        let page = CGFloat(Int(offset.x / screenW) - 1)

        
            switch sender.direction {

            case .left:
                print("swipe right")
                print("%%%", page)
                print("%%%", CGFloat(urls.count - 2))
                if page >= CGFloat(urls.count - 2) {
                    self.arrowRightButton.isHidden = true
                } else {
                    self.arrowRightButton.isHidden = false
                }
                
            case .right:
                print("swipe left")
                if page < 0 {
                    self.arrowLeftButton.isHidden = true
                } else {
                    self.arrowLeftButton.isHidden = false
                }

            default:
                break
            }
    }
    
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        self.arrowLeftButton.isHidden = true
        self.imageCollection.delegate = self
        self.imageCollection.dataSource = self
        self.imageCollection.isPagingEnabled = true
        self.imageCollection.reloadData()
        

        let leftSwipeGesture = UISwipeGestureRecognizer(
                target: self,
                action: #selector(PhotoViewController.gesSwipe(_:))
        
        )
        
        leftSwipeGesture.direction = .left
        self.view.addGestureRecognizer(leftSwipeGesture)
        
        
        let rightSwipeGesture = UISwipeGestureRecognizer(
                target: self,
                action: #selector(PhotoViewController.gesSwipe(_:))
        
        )
        
        rightSwipeGesture.direction = .right
        self.view.addGestureRecognizer(rightSwipeGesture)
        
    }
    
    
    // MARK: methods
    @IBAction func arrowLeftTapped(_ sender: Any) {
        let screenW = UIScreen.main.bounds.width
        let offset: CGPoint = imageCollection.contentOffset
        let page = CGFloat(Int(offset.x / screenW) - 1)
        self.arrowRightButton.isHidden = false
        if page <= 0 {
            self.arrowLeftButton.isHidden = true
        } else {
            self.arrowLeftButton.isHidden = false
        }
        if page >= 0 {
            imageCollection.setContentOffset(CGPoint(x: screenW * page, y: 0), animated: true)
        }
    }
    
    @IBAction func arrowRightTapped(_ sender: Any) {
        let screenW = UIScreen.main.bounds.width
        let offset: CGPoint = imageCollection.contentOffset
        let page = CGFloat(Int(offset.x / screenW) + 1)
        self.arrowLeftButton.isHidden = false
        if page >= CGFloat(urls.count - 1) {
            self.arrowRightButton.isHidden = true
        } else {
            self.arrowRightButton.isHidden = false
        }
        if page < CGFloat(urls.count) {
            imageCollection.setContentOffset(CGPoint(x: screenW * page, y: 0), animated: true)
        }
    }
}

extension PhotoViewController: UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
    // section数
    func numberOfSections(in collectionView: UICollectionView) -> Int {
        return 1
    }
    
    // 列数
    func collectionView(_ collectionView: UICollectionView,
                        numberOfItemsInSection section: Int) -> Int {
        return self.urls.count
    }
    
    // セル生成
    func collectionView(_ collectionView: UICollectionView,
                        cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let photoCell: PhotoCell = collectionView.dequeueReusableCell(withReuseIdentifier: "PhotoCell", for: indexPath) as! PhotoCell

        if indexPath.row < self.urls.count {
            photoCell.setImageURL(url: self.urls[indexPath.row])
        }
        return photoCell
    }
    
    // Screenサイズに応じたセルサイズを返す
    // UICollectionViewDelegateFlowLayoutの設定が必要
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        return CGSize(width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height)
    }
}

extension PhotoViewController: PhotoCellDelegate {
    func isNotFound(url: URL) {
        if let index = urls.firstIndex(of: url) {
            self.urls.remove(at: index)
            self.imageCollection.reloadData()
        }
    }
}

更新这对我有用

public func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer) {
        let pageWidth = self.imageCollection.bounds.width
        let targetXContentOffset = Float(targetContentOffset.pointee.x)
        let contentWidth = Float(self.imageCollection!.contentSize.width)
        
        if targetXContentOffset == 0.0 {
            self.arrowLeftButton.isHidden = true
        }
                
        else {
            self.arrowLeftButton.isHidden = false
        }
        
        if contentWidth == targetXContentOffset + Float(pageWidth) {
            self.arrowRightButton.isHidden = true
        }
        
        else {
            self.arrowRightButton.isHidden = false
        }
    }