Passing TableView Data to DetailViewController in swift - swift

Question

I have a simple tableview loading with array of colours(each cell with different colour).i am trying to pass the background colour of detailViewController when user press the colour array cell from colourTableviewcontroller(simply i want to pass the cell colour as a detailview background colour)
my code as follows.....
import UIKit
class colourTableviewcontroller: UITableViewController {
#IBOutlet weak var colorTableView: UITableView!
let colors = [UIColor.redColor(), UIColor.blueColor(),UIColor.greenColor(), UIColor.orangeColor(),UIColor.purpleColor(),UIColor.yellowColor(),UIColor.cyanColor(),UIColor.darkGrayColor(),UIColor.blackColor(), UIColor.brownColor(),UIColor.grayColor(), UIColor.magentaColor(), UIColor.whiteColor()]
var colourData = UIColor()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func viewDidAppear(animated: Bool) {
colorTableView.separatorColor = UIColor.clearColor()
}
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return colors.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("colourCell", forIndexPath: indexPath) as UITableViewCell
cell.backgroundColor = self.colors[indexPath.row % self.colors.count]
return cell
}
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
colourData = self.colors[indexPath.row]
performSegueWithIdentifier("colourSegue", sender: self)
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if (segue.identifier == "colourSegue") {
let viewController = segue.destinationViewController as! DetailViewController
viewController.bc?.backgroundColor = colourData }
}}
// My DetailViewController as follows...
import UIKit
class DetailViewController: UIViewController {
#IBOutlet var bc: UIView!
override func viewDidLoad() {
self.bc.backgroundColor = UIView.appearance().backgroundColor
}
when i run the code my DetailViewController background colour changing to dark text colour when i press the colour array.....
i don't know what i am missing or am i doing wrong approach/logic....
Thanks in Advance.....

Answer 1

First of all in ColourTableviewcontroller connect the segue to the table view cell rather than to the view controller and delete the method didSelectRowAtIndexPath
Replace prepareForSegue with
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "colourSegue" {
let viewController = segue.destinationViewController as! DetailViewController
let selectedIndexPath = tableView.indexPathForCell(sender as! UITableViewCell)
viewController.color = colors[selectedIndexPath.row]
}
}
In DetailViewController declare a variable color
var color : UIColor!
And set the color of bc in viewDidLoad()
bc.backgroundColor = color
The reason for the additional variable is that the IBOutlets in DetailViewController don't exist yet while prepareForSegue is executed.

Answer 2

You aren't passing the UIColor and assigning it in the next View Controller
You just need to do few modifications to your existing code
1) Add var recievedColor : UIColor! in the DetailViewController
2) In your prepareForSegue replace viewController.bc?.backgroundColor = colourData with viewController.recievedColor = colourData
3) In your DetailViewController, in viewDidLoad() function, replace self.bc.backgroundColor = UIView.appearance().backgroundColor with self.bc.backgroundColor = recievedColor
And there you go!

Answer 3

You need to pass the color, then assign the color to the view on the viewDidLoad(). You are assigning a variable to a view that hasn't been initialized yet.
in your detail class do as follow:
class DetailViewController: UIViewController {
#IBOutlet var bc: UIView!
var selectedBackgroundColor: UIColor? // this should be set on the prepareForSegue method.
override func viewDidLoad() {
super.viewDidLoad()
if let selectedBackgroundColor = selectedBackgroundColor {
bc.backgroundColor = selectedBackgroundColor
}
}
Hope this helps!