Segue to detailed view controller using a button in a cell - swift

Question

I have a collection view cell that passes data to a detailed view controller. When the cell is clicked, it segues into a view controller with more details. In the cells, I have a button, when the button is clicked, it also segues into a detailed view controller but a different view controller from when the cell is clicked.
This is what my didselect function looks like.
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "details" {
self.navigationController?.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName: UIColor.white]
if let indexPaths = self.CollectionView!.indexPathsForSelectedItems{
let vc = segue.destination as! BookDetailsViewController
let cell = sender as! UICollectionViewCell
let indexPath = self.CollectionView!.indexPath(for: cell)
let post = self.posts[(indexPath?.row)!] as! [String: AnyObject]
let Booked = post["title"] as? String
let Authors = post["Author"] as? String
let ISBNS = post["ISBN"] as? String
let Prices = post["Price"] as? String
let imageNames = post["image"] as? String
let imagesTwo = post["imageTwo"] as? String
let imagesThree = post["imageThree"] as? String
let imagesFour = post["imageFour"] as? String
let imagesFive = post["imageFive"] as? String
vc.Booked = Booked
vc.Authors = Authors
vc.ISBNS = ISBNS
vc.Prices = Prices
vc.imageNames = imageNames
vc.imagesTwo = imagesTwo
vc.imagesThree = imagesThree
vc.imagesFour = imagesFour
vc.imagesFive = imagesFive
print(indexPath?.row)
} }
if segue.identifier == "UsersProfile" {
if let indexPaths = self.CollectionView!.indexPathsForSelectedItems{
let vc = segue.destination as! UsersProfileViewController
let cell = sender as! UICollectionViewCell
let indexPath = self.CollectionView!.indexPath(for: cell)
let post = self.posts[(indexPath?.row)!] as! [String: AnyObject]
let username = post["username"] as? String
let userpicuid = post["uid"] as? String
vc.username = username
vc.userpicuid = userpicuid
print(indexPath?.row)
}}}
For if the segue == User's Profile I get an error in the let cell = line. My button in the cell was created in the cellForItemAt collection view function
let editButton = UIButton(frame: CGRect(x: 106, y: 171, width: 36, height: 36))
editButton.addTarget(self, action: #selector(editButtonTapped), for: UIControlEvents.touchUpInside)
editButton.tag = indexPath.row
print(indexPath.row)
editButton.isUserInteractionEnabled = true
cell.addSubview(editButton)
When I click the cell, it works perfectly and segues me into a detailed view controller but when I click the button within the cell, I get an error.
Here is my editTappedButton function
#IBAction func editButtonTapped() -> Void {
print("Hello Edit Button")
performSegue(withIdentifier: "UsersProfile", sender: self)
}

Answer 1

It is obvious that you are getting that crash because with your button action you are calling performSegue(withIdentifier: "UsersProfile", sender: self) now with sender you are passing self means reference of current controller not the UICollectionViewCell what you need is get the indexPath of that cell and pass that and now in prepareForSegue cast the sender to IndexPath instead of UICollectionViewCell.
First replace your editButtonTapped with below one
#IBAction func editButtonTapped(_ sender: UIButton) -> Void {
print("Hello Edit Button")
let point = sender.superview?.convert(sender.center, to: self.tableView)
if let indexPath = self.tableView.indexPathForRow(at: point!) {
performSegue(withIdentifier: "UsersProfile", sender: indexPath)
}
}
Now in prepareForSegue for identifier UsersProfile cast the sender to IndexPath or simply replace your condition with my one.
if segue.identifier == "UsersProfile" {
if let indexPath = sender as? IndexPath{
let vc = segue.destination as! UsersProfileViewController
let post = self.posts[indexPath.row] as! [String: AnyObject]
let username = post["username"] as? String
let userpicuid = post["uid"] as? String
vc.username = username
vc.userpicuid = userpicuid
print(indexPath.row)
}
}