error "secondViewController does not have a member named "mastername" - swift

Question

I am using a sample from IOS 8 App Development Essentials. I added a variable to my second controller but keep getting this error.
Second controller code:
Class SocondDetailController: UIViewController{
var mastername: String?
...
}
First controller code:
override func prepareForSegue(segue: UIStoryboardSegue,sender: AnyObject?)
{
if segue.identifier == "ShowDetails"
{        
let detailViewController = segue.destinationViewController as SocondDetailController
let myIndexPath = self.tableView.indexPathForSelectedRow()
let row = myIndexPath?.row
SocondDetailController.mastername = tableData[row!]
}
}
I am new to Swift and IOS development. Just starting at age 71.
I have been using VB.Net for a long time.
Please help.
Thanks.

Answer 1

This row:
SocondDetailController.mastername = tableData[row!]
should be:
detailViewController.mastername = tableData[row!]
mastername is an instance property, and as such you have to access to it through an instance of SocondDetailController, and not the SocondDetailController type itself.
Also, although probably not needed due to the logic in your view controller, I'd avoid using the forced unwrapping operator !, preferring a safer optional binding:
let row = myIndexPath?.row
if let row = row {
detailViewController.mastername = tableData[row]
}
or, more concisely:
if let row = myIndexPath?.row {
detailViewController.mastername = tableData[row]
}