問題描述
檢測位於另一個 uicollectionview 內的 uicollectionView 的哪個 UICollectionViewCell 在中心 (Detect which UICollectionViewCell of a uicollectionView that is inside another uicollectionview is in the center)
所以我有一個水平 UICollectionView 圖像，它位於垂直 UICollectionView 內，當我從垂直單元格中選擇一個單元格時，我想檢測哪個單元格位於水平 UICollectionView 的中心，我試圖發送通知並調用完成這項工作的函數，但由於它重複使用同一個單元格而被多次調用，所以最後我沒有得到適當的 indexPath。
而且當我點擊圖像時，“didSelectItemAt” 水平collectionView被調用，有沒有辦法讓垂直collectionView被調用？謝謝
參考解法
方法 1:
Your best bet would be delegates via protocols
Create protocol for your collection view cells
protocol yourDelegate: class {
func didSelectCell(WithIndecPath indexPath: IndexPath, InCollectionView collectionView: UICollectionView) ‑> Void
}
In your cells, create a function called setup which you can call at cellForRow. In your cells, create a touch recogniser for self. Disable cell selection for your collection views since these delegates will be called when the user touches given cell.
class yourCell: UICollectionViewCell {
var indexPath: IndexPath? = nil
var collectionView: UICollectionView? = nil
weak var delegate: yourDelegate? = nil
override func awakeFromNib() {
super.awakeFromNib()
let selfTGR = UITapGestureRecognizer(target: self, action: #selector(self.didTouchSelf))
self.contentView.addGestureRecognizer(selfTGR)
}
@objc func didTouchSelf() {
guard let collectionView = self.collectionView, let indexPath = self.indexPath else {
return
}
delegate?.didSelectCell(WithIndecPath: indexPath, InCollectionView: collectionView)
}
func setupCell(WithIndexPath indexPath: IndexPath, CollectionView collectionView: UICollectionView, Delegate delegate: yourDelegate) {
self.indexPath = indexPath
self.collectionView = collectionView
self.delegate = delegate
}
}
In your viewController, create extension for this protocol and if you do everything right, when the user touches your cell, the cell will call you via this delegation.
extension YourViewController: yourDelegate {
func didSelectCell(WithIndecPath indexPath: IndexPath, InCollectionView collectionView: UICollectionView) {
//You have your index path and you can "if" your colllection view
if collectionView == self.yourFirstCollectionView {
} else if collectionView == self.yourSecondCollectionView {
}
//and so on..
}
}
since protocol is ": class", we can use weak for your delegate property so no memory leak will occur. I use this method for tableViews and collectionViews throughout my projects.
(by Vince Mohamed、Tomo Norbert)