获取 CollectionViewCell 外部的 IndexPath

Question

首先，我是 swift 的新手，所以要温柔。我在获取单元格外的单元格indexPath时遇到问题。我想获取函数的索引路径并使用它来将内容发送到另一个视图。图像是在单元格中以编程方式创建的，它有一个点击手势识别器发送到此函数(其中"myIndex"定义为Int : var myIndex = 0)：

// tap image to go at the indexpath of the user
func imageTapped(tapGestureRecognizer: UITapGestureRecognizer) {
print("image tapped")
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let secondViewController = storyboard.instantiateViewController(withIdentifier: "patientProfile") as! PatientProfileVC
secondViewController.userID = posts[myIndex].userID
secondViewController.patientName = posts[myIndex].author
print("Passed data to the other view")
self.show(secondViewController, sender: self)

}

我知道我可以在 IndexPath 上使用 didSelectItem，在那里我也有myIndex的声明，但我有一些东西会从那里的 segue 触发：

//standard functon for item selected
override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
//get the index of the cell
myIndex = indexPath.row
print("Cell is selected")
//perform the segue
self.performSegue(withIdentifier: "CommentsVC", sender: self)
print(myIndex)
}

我对 Segue 的表演看起来像这样：' 覆盖

func prepare(for segue： UIStoryboardSegue， sender： Any？) {

print("Segue Initiated")
feed.navigationItem.title = nil
//if segue.destination is CommentsFullVC{
print("Comments segue initiated")
let secondViewController = segue.destination as! CommentsFullVC
secondViewController.questionData = posts[myIndex].postContent
secondViewController.authorName = posts[myIndex].author
secondViewController.date = posts[myIndex].normalDate
secondViewController.profileImagePath = posts[myIndex].pathToImage
secondViewController.typeOfClinic = posts[myIndex].clinic
secondViewController.postID = posts[myIndex].postID
secondViewController.followersForPost = posts[myIndex].followers
}

所以我的问题是，如何在不使用 prepareForSegue 的情况下将这两个字段传递给另一个视图？我现在为此挣扎了 20 个小时，但仍然无法弄清楚。

secondViewController.userID = posts[myIndex].userID
secondViewController.patientName = posts[myIndex].author

更新：多亏了何塞的回答，它才开始工作，现在看起来像这样......以防有人遇到与我相同的问题。

// tap image to go at the indexpath of the user
func imageTapped(tapGestureRecognizer: UITapGestureRecognizer) {
print("image tapped")

let pointInCollectionView = tapGestureRecognizer.location(in: collectionView)
let indexPath = collectionView?.indexPathForItem(at: pointInCollectionView)
print(indexPath!)
// this one works - show segue
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let secondViewController = storyboard.instantiateViewController(withIdentifier: "patientProfile") as! PatientProfileVC
secondViewController.userID = posts[(indexPath?.row)!].userID
secondViewController.patientName = posts[(indexPath?.row)!].author
print("Passed data to the other view")
self.show(secondViewController, sender: self)

}

Answer 1

获取tapGestureRecognizer在collectionView中的位置，然后获取给定位置的indexPath

let pointInCollectionView = tapGestureRecognizer.location(in: collectionView)
let indexPath = collectionView.indexPathForItem(at: pointInCollectionView)

Answer 2

我认为这对于单元格的代表来说很容易，但它有点复杂。

简单的答案应该是将索引存储在图像的"tag"属性中点击图像的视图，然后从手势识别器中提取 您可以在创建 imageView 的位置添加一个标记，恢复标记的代码将如下所示：

func imageTapped(tapGestureRecognizer: UITapGestureRecognizer) {
print("image tapped")
var myIndex = 0
if let imageView = tapGestureRecognizer.view {
myIndex = imageView.tag
}
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let secondViewController = storyboard.instantiateViewController(withIdentifier: "patientProfile") as! PatientProfileVC
secondViewController.userID = posts[myIndex].userID
secondViewController.patientName = posts[myIndex].author
print("Passed data to the other view")
self.show(secondViewController, sender: self)

}

Answer 3

如果你的代码像下面这样写，那么试试这个

行的集合视图单元格 方法

cell.image = indexPath.row
let tap = UITapGestureRecognizer.init(target: self, action: #selector(imageTapped(_:)))
tap.accessibilityElements = [indexPath]
cell.image.addGestureRecognizer(tap)

集合视图的函数

func imageTapped (_ sender:UITapGestureRecognizer) {
let index = sender.accessibilityElements?.first as! IndexPath   
print(index.row)
myIndex = index.row
}