Segue lag, tableview in Swift - ios

Question

I am working at my first application in Swift 3. I am using tableView (by "extension MainController: UITableViewDataSource"). And from this tableView, by storyboard I have two segues. One for editing (by clicking on accessory icon) and the second one for more detail screen (by clicking on a table row). I am not calling this segues by code, but by storyboard.
And my problem is that there is sometimes huge lag. Like after clicking on a row, the next screen is showing after 30 seconds. But now always. Sometimes its working immediately. Interesting thing is that when I touch row 1, and nothing happens, next I am clicking row 2 and then row 1 is appearing.
I am also using delegates, this is the code for preparing segues:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// 1
if segue.identifier == "AddSensor" {
// 2
let navigationController = segue.destination
as! UINavigationController
// 3
let controller = navigationController.topViewController
as! AddController
// 4
controller.delegate = self
}
else if segue.identifier == "EditSensor" {
let navigationController = segue.destination
as! UINavigationController
let controller = navigationController.topViewController
as! AddController
controller.delegate = self
if let indexPath = tableView.indexPath(
for: sender as! UITableViewCell) {
controller.sensorToEdit = sensors[indexPath.row]
}
}
else if segue.identifier == "DetailSeq" {
let navigationController = segue.destination
as! UINavigationController
let controller = navigationController.topViewController
as! DetailController
controller.delegate = self
if let indexPath = tableView.indexPath(
for: sender as! UITableViewCell) {
controller.sensorRecieved = sensors[indexPath.row]
}
}
}
I was reading that it was common bug in iOS8 and could be resolved by adding
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
DispatchQueue.main.async {
self.performSegue(withIdentifier: "DetailSeq",sender: self)
}
}
But it didn't worked for me. I don't know what should I do next to resolve this problem. Can anyone guide me?

Answer 1

According to this SO question, you may be able to fix your bug if you present your view controller in code rather than with the segue in the storyboard. Something like this, where your destination is the VC that you want to go to.
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath:
NSIndexPath) {
DispatchQueue.main.async {
self.presentViewController(destination, animated: true) { () -> Void
in
}
}
}

Answer 2

You have to use like this :
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
DispatchQueue.main.async {
self.performSegue(withIdentifier: "DetailSeq",sender: self)
}
}