Basically, both using IB or when you do it programmatically, you have to configure your new viewcontroller with all the data it needs before the segue is performed (or the controller is presented via code).
In your case, just set the image name (your custom view controller class YourViewController should have a specific String property to hold this value) overriding prepareForSegue in the current view controller class:
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "yourModalSegueIdentifier" {
let imgName= (sender as! UIImageView)
let destination = segue.destinationViewController as UINavigationController
let yourController = destination.topViewController as YourViewController
yourController.imageName= <name here>
}
}
This solves the passing data question.
But in your case, you need the name of the clicked image, and that can be only obtained adding a click event through a UIGestureRecognizer to the UIImageView.
So, you'll need a uigesturerecognized that on click will perform the segue you've created. And also, you will not be able to get the name of the image asset (the one you use the creating an UIImage using imageNamed:) because it's not available anymore, and yo'll have to use the accessibilityIdentifier.
This makes everything way more complicated, it seems it could be done for the most part graphically here and here(but it's not really clear how to do it), but it's usually done via code.
Simplifying it a bit using a global variable:
var currentImage = ""
func viewDidLoad(){
...
...
let aTap = UITapGestureRecognizer(target: self, action: Selector("imageTapped:"))
aTap.numberOfTapsRequired = 1
//For every image, configure it with recognizer and accessibilityId:
firstImage.userInteractionEnabled = true
firstImage.addGestureRecognizer(aTap)
firstImage.accessibilityIdentifier = "firsImage"
...
}
func imageTapped(recognizer:UITapGestureRecognizer) {
let imageView = recognizer.view as! UIImageView
currentImage = imageView.accessibilityIdentifier
self.performSegueWithIdentifier("yourModalSegueIdentifier", sender: self)
}
And change this:
yourController.imageName= <name here>
to this:
yourController.imageName= currentImage
Update:
- Do i need to provide name to every segue i created on storyboard?
Yes, it's the only way to identify them, every UIStoryboardSegue has an identifier. But remember, segues are not the only way to go from a controller to another, if you do it completely programmatically (no segues) you usually call "presentViewController". Segues are a storyboard concept.
Again, regarding the segue name/identifier, you didn't need it until now because you never referenced that segue from your code, you need it for both prepareForSegue and performSegueWithIdentifier. Just select the segue and give it a name on the right inspector pane.
The structure you describe seems ok, the only thing it's that i'm not so sure that the UIButtons are really needed, try with a modal segue from the imageview or directly from the viewcontroller to the destination view controller.
Update 2:
If you are starting and need a free course that will teach you the basics and also make you build a few interesting ios apps i recommend hackingwithswift.
