Push segue from UITableViewCell to ViewController in Swift

The following steps should fix your problem. If not, please let me know.

1. Remove your tableView(tableView, didSelectRowAtIndexPath:) implementation.

2. Make data on RestaurantViewController have type NSDictionary!

3. Determine the selected row in prepareForSegue:

   override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {
       if let cell = sender as? UITableViewCell {
           let i = tableView.indexPathForCell(cell)!.row
           if segue.identifier == "toRestaurant" {
               let vc = segue.destinationViewController as RestaurantViewController
               vc.data = currentResponse[i] as NSDictionary
           }
       }
   }
   

The problem is that you're not handling your data correctly. If you look into your currentResponse Array, you'll see that it holds NSDictionaries but in your prepareForSegue you try to cast a NSDictionary to a NSArray, which will make the app crash.

Change the data variable in RestaurantViewController to a NSDictionary and change your prepareForSegue to pass a a NSDictionary

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {
    if let cell = sender as? UITableViewCell {
        let i = redditListTableView.indexPathForCell(cell)!.row
        if segue.identifier == "toRestaurant" {
            let vc = segue.destinationViewController as RestaurantViewController
            vc.data = currentResponse[i] as NSDictionary
        }
    }
}  

For Swift 5

func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {
        if let cell = sender as? UITableViewCell {
            let i = self.tableView.indexPath(for: cell)!.row
            if segue.identifier == "toRestaurant" {
                let vc = segue.destination as! RestaurantViewController
                vc.data = currentResponse[i] as NSDictionary
            }
        }
    }