Deleting a Row from a UITableView in Swift?

Question

I have a table of names and I am making a swipe and delete function for them which removes them from a names variable which is an array.

I selected the functions which most closely resembled the tutorial inside xcode and filled them out, but my app crashes randomly when I click the delete button. Here is my code for the delete button:

func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]? {     let deleteAction = UITableViewRowAction(style: .destructive, title: "Delete") { (rowAction: UITableViewRowAction, indexPath: IndexPath) -> Void in         print("Deleted")         self.catNames.remove(at: indexPath.row)         self.tableView.deleteRows(at: [indexPath], with: UITableViewRowAnimation.automatic)         self.tableView.reloadData()     } } 

I'm new to coding and learning swift, I am following a tutorial for swift 2 and working with swift 3 so there are a few issues I have when following along, this being one I'm properly stuck on.

Answer 1

Works for Swift 3 and Swift 4

Use the UITableViewDataSource tableView(:commit:forRowAt:) method, see also this answer here:

func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {   if editingStyle == .delete {     print("Deleted")      self.catNames.remove(at: indexPath.row)     self.tableView.deleteRows(at: [indexPath], with: .automatic)   } } 

Answer 2

First you need to add this function

func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {     return true  } 

then your function is ok but no need of tableview reload data just call tableview.beingUpdates and tableview.endUpdates

func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {     if editingStyle == .delete {        print("Deleted")        self.catNames.remove(at: indexPath.row)        self.tableView.beginUpdates()        self.tableView.deleteRows(at: [indexPath], with: .automatic)        self.tableView.endUpdates()      } }