How to send didSelectRowAtIndexPath back to view controller in swift - swift

Question

I have 1 viewController and 1 tableViewController in swift. I can send an NSMutableArray from the viewController to populate the tableViewController using segue. I do not know how to send the selected row back to the view controller. The code so far:
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
println("You selected cell #\(indexPath.row)!")
// Missing code for sending back the selected row
self.dismissViewControllerAnimated(true, completion: nil)
}
Any ideas?

Answer 1

You can use the delegation pattern. Create a protocol:
protocol MyDataDelegate {
didSelectRow(row: NSIndexPath, data: MyData)
}
In the table controller, add a property:
var myDataDelegate: MyDataDelegate?
and in the didSelectRowAtIndexPath call the delegate method:
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
println("You selected cell #\(indexPath.row)!")
let data = getDataForRow(indexPath) // <== You need to implement it
self.myDataDelegate?.didSelectRow(indexPath, data: data)
self.dismissViewControllerAnimated(true, completion: nil)
}
Next, in your main view controller:
implement the MyDataDelegate protocol
implement the MyDataDelegate.didSelectRow method
right before presenting the table controller (or after creating it, if you manually do it), set the myDataDelegate property of the table controller to self
This way, when a row is selected in your table controller, the didSelectRow method is called on your main view controller, so you can do whatever you need with the index path and/or the data.
Of course feel free to change the didSelectRow signature (use the indexpath, or a row index, with or without data, etc.)