您应该只添加UISwipeGestureRecognizer到主视图控制器的视图。主视图控制器将负责管理手势的调用

基本上在代码中：

在viewDidLoad：

let swipeToLeft = UISwipeGestureRecognizer(target: self, action: #selector(changePageOnSwipe(_:)))
let swipeToRight = UISwipeGestureRecognizer(target: self, action: #selector(changePageOnSwipe(_:)))
swipeToLeft.direction = .right 
swipeToRight.direction = .left
self.contentSubView.addGestureRecognizer(swipeToLeft) // Gesture are added to the top view that should handle them
self.contentSubView.addGestureRecognizer(swipeToRight)

由于您必须从索引的VC移到另一个索引，因此可能需要一个属性来跟踪当前选定的视图控制器：

var currentIndexPath: IndexPath?

您可以在每次选择新的VC时更改其值。所以：

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    print("You selected cell #\(indexPath.item)!")
    self.currentIndexPath = indexPath
    // ... Other settings
}

changePageOnSwipe(_ gesture: UISwipeGestureRecognizer)在您的主ViewController中添加方法。由于拥有的是“首席”视图控制器collectionView，因此它将处理滑动并告诉其子代出现：

func changePageOnSwipe(_ gesture: UISwipeGestureRecognizer) {
    guard let indexPath = self.currentIndexPath else {
        // When the page loads and there is no current selected VC, the swipe will not work
        // unless you set an initial value for self.currentIndexPath
        return
    }

    var newIndex = indexPath    // if self.collectionview.indexPathsForSelectedItems is not empty, you can also use it instead of having a self.currentIndexPath property

    // move in the opposite direction for the movement to be intuitive
    // So swiping " <-- " should show index on the right (row + 1)
    if gesture.direction == .left {
        newIndex = IndexPath(row: newIndex.row+1, section: newIndex.section)
    } else {
        newIndex = IndexPath(row: newIndex.row-1, section: self.currentIndexPath!.section)
    }

    if canPresentPageAt(indexPath: newIndex) {
        // Programmatically select the item and make the collectionView scroll to the correct number
        self.collectionview.selectItem(at: newIndex, animated: true, scrollPosition: UICollectionViewScrollPosition.centeredHorizontally)
        // The delegate method is not automatically called when you select programmatically
        self.collectionView(self.collectionview, didSelectItemAt: newIndex!)
    } else {
        // Do something when the landing page is invalid (like if the swipe would got to page at index -1 ...)
        // You could choose to direct the user to the opposite side of the collection view (like the VC at index self.items.count-1
        print("You are tying to navigate to an invalid page")
    }
}

并且由于您是通过编程方式进行滑动，因此在尝试实际移动之前，必须确保滑动 有效 。您必须 添加安全检查 ：

/** You can use an helper method for those checks
 */
func canPresentPageAt(indexPath: IndexPath) -> Bool {
    // Do necessary checks to ensure that the user can indeed go to the desired page
    // Like: check if you have a non-nil ViewController at the given index. (If you haven't implemented index 3,4,5,... it should return false)
    //
    // This method can be called either from a swipe
    // or another way when you need it
    if indexPath.row < 0 || indexPath.row >= self.items.count {
        print("You are trying to go to a non existing page")
        return false
    } else {
        print("If you haven't implemented a VC for page 4 it will crash here")
        return true;
    }
}

最后，您可以在中设置默认的indexPath
self.currentIndexPath，viewDidLoad以便用户在登陆主VC时已经可以滑动而无需在collectionView中选择另一个VC。

注意：如果您在子ViewController中碰巧有手势识别器，则某些手势可能会发生冲突，您将必须学习如何使用诸如的委托方法来解决此类冲突gestureRecognizer(_:shouldRequireFailureOf:)。