Still showing nil variable on didSelectRow method - ios

Question

courseData is an array of struct objects. Each object has 9 string variables (holeNumber, Par, SI, plan etc) The cells populate fine but when you click on a row I am trying to get a detail view controller to populate an image view with the image held under variable plan for the relevant struct in the array. Complete code shown. courseImage1 variable still shows nil. Please help I have been stuck for 3-days!
Note: var CourseImage1: UIImage? is declared publicly at the top of my code.
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return courseData.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("Hole") as UITableViewCell
let item = courseData[indexPath.row]
let holeLabel = cell.viewWithTag(1) as UILabel
holeLabel.text = item.holeNumber
let parLabel = cell.viewWithTag(2) as UILabel
parLabel.text = item.par
let siLabel = cell.viewWithTag(3) as UILabel
siLabel.text = item.SI
let wyLabel = cell.viewWithTag(4) as UILabel
wyLabel.text = item.whiteYards
let yyLabel = cell.viewWithTag(5) as UILabel
yyLabel.text = item.yellowYards
let ryLabel = cell.viewWithTag(6) as UILabel
ryLabel.text = item.redYards
let photo = item.image
let placeholder = cell.viewWithTag(7) as UIImageView
placeholder.image = UIImage(named: photo)
return cell
}
func tableView(tableView: UITableView, didselectRowAtIndexPath indexPath: NSIndexPath) {
let courseSection = courseData[indexPath.row]
var tipPic = courseSection.plan
var courseImage : UIImage = UIImage(named: tipPic)!
courseImage1 = courseImage
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
var destViewController : DetailViewController = segue.destinationViewController as DetailViewController
if (segue.identifier == "courseTip") {
destViewController.receivedPic = courseImage1
}
}
}
func tableView(tableView: UITableView, didDeselectRowAtIndexPath indexPath: NSIndexPath) {
(indexPath, animated: false)
}

Answer 1

Because didSelectRowAtIndexPath fires after the prepareForSegue, put all the relevant logic in the latter method:
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
var destViewController : DetailViewController = segue.destinationViewController as DetailViewController
if (segue.identifier == "courseTip") {
// I assume "self.tableView" points to your TV, if not amend the name below
if let indexPath = self.tableView.indexPathForSelectedRow() {
let courseSection = courseData[indexPath.row]
var tipPic = courseSection.plan
var courseImage : UIImage = UIImage(named: tipPic)!
destViewController.receivedPic = courseImage
} else {
println("Oops, no row has been selected")
}
}
}