Question about segue and NSViewController

Question

I am new in Swift and have a question.

I have ViewController for my customer with a included a tableView that list their past invoice. When I double click on an invoice, it open the Invoice ViewController that detail the transaction. I segue the invoice number from the CustomerVC to the InvoiceVC and it work just fine, except if the InvoiceVC is already open. This is what I have to solve.

When the InvoiceVC is open:

1. I am not sure if InvoiceVC received the segue. I have tried to print the invoice number but its equal to 0 as it was init.
2. Is there a function that can be used when the InvoiceVC is activated ( similar to viewDidLoad) that can be used when InvoiceVC receive a segue. if its already open.

Here is the code in the ClientVC:

@objc func tableViewDoubleClick(_ sender:AnyObject) {

if  tableView.selectedRow >= 0 {
    
    let srow = tableView.selectedRow

    fact_nb = Int(fact_tbv[srow].id_f) ?? 0  // invoice nb that you want to segue

    self.performSegue(withIdentifier: "gotofact", sender: nil)   // segue identifier

    }
}


override func prepare(for segue: NSStoryboardSegue, sender: Any?) {
    let sb = segue.destinationController as! FacturesVC
    print ("VCC569:", fact_nb)
    
    sb.factnb = fact_nb
}

This is the code in the Invoice VC:

class FacturesVC: NSViewController, NSTextFieldDelegate,NSComboBoxDelegate, NSTableViewDelegate {
... 
var factnb: Int = 0
...

func Load_DB( Lfact_ptr: Int) {
...  
// if factnb correspong to an InvoiceNb -  select that invoice...

if  factnb == Int(facts_list[facts_select[i]].id_f) {
            fact_ptr = facts_select[i]
            factnb = 0
        }

Thanks for your help.

Answer 1

The method post here, using notification, have solved my problem.

https://gist.github.com/ayakix/00a38f402f4bf3efb2c8acaad94b4616