pass the data from uitableview to other uiview - ios

Question

I'm new in swift and IOS, i have some problem to pass the dictionary data to other uiview, anyone can help me to fix it?
LessonsTableViewController:
var mylessons = [
["title":"Posture", "subtitle":"Set up your body", "bgimage":"1", "lesimage":"l1"],
["title":"Breathing", "subtitle":"Breathing deeply", "bgimage":"2", "lesimage":"l2"],
["title":"Breathing", "subtitle":"Breathing Exercise", "bgimage":"3", "lesimage":"l3"],
["title":"Health", "subtitle":"Do’s & Don’ts", "bgimage":"4", "lesimage":"l4"]
]
and
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! LessonsTableViewCell
let lessonsObject = mylessons[indexPath.row]
cell.backgroundImageView.image = UIImage(named: lessonsObject["bgimage"]!)
cell.titleLabel.text = lessonsObject["title"]
cell.subtitleLabal.text = lessonsObject["subtitle"]
return cell
}
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
performSegue(withIdentifier: "LessonSegue", sender: mylessons[indexPath.row])
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?){
let lessegue = segue.destination as! LessonDetailsViewController
lessegue.SelectedLessons = mylessons
}
LessonDetailsViewController:
#IBOutlet weak var LTitle: UILabel!
var SelectedLessons = [Dictionary<String, String>()]
override func viewDidLoad() {
super.viewDidLoad()
LTitle.text = SelectedLessons["title"]
// Do any additional setup after loading the view.
}
Finally, it has an error "Cannot subscript a value of type '[Dictionary]' with an index of type 'String'.

Answer 1

First your SelectedLessons is wrong type. You need use something like tis
var SelectedLessons:Dictionary<String, String>?
And you need past correct object.
override func prepare(for segue: UIStoryboardSegue, sender: Any?){
let lessegue = segue.destination as! LessonDetailsViewController
lessegue.SelectedLessons = sender as? Dictionary<String,String>
}

Answer 2

You should declare
var SelectedLessons = [String, String]()
Your current declaration is an array of dictionaries

Answer 3

You have a number of problems.
First is a coding style issue. Variable names should start with a lower-case letter, so SelectedLessons should be selectedLessons.
Second, you likely want to pass the user-selected lesson to the destination, not the entire array.
Your array mylessons is an array of dictionaries: (Type [[String:String]])
You should probably name the variable in LessonDetailsViewController selectedLesson (singular, starting with a lower-case letter) and make it type [String: String] (a single lesson.)
Then your prepareForSegue might look like this:
override func prepare(for segue: UIStoryboardSegue, sender: Any?){
guard
let lessegue = segue.destination as? LessonDetailsViewController,
let selectedRow = tableView.indexPathForSelectedRow?.row else {
print("Error. No row selected. Exiting."
fatalError()
}
lessegue.selectedLesson = myLessons[selectedRow]
}
(The code above should have better error handling for the case where there's not a selected row, but it should give you the idea.)
EDIT:
By the way, it's not a good idea to write your prepare(for:) method as if you will only ever segue to a single view controller of a single type. It's very common to go back and expand an app to add additional segues, and if you do that, the code above will crash. Better to use a switch statement:
override func prepare(for segue: UIStoryboardSegue, sender: Any?){
switch segue.destination {
case let lessegue as LessonDetailsViewController:
guard
let selectedRow = tableView.indexPathForSelectedRow?.row else {
print("Error. No row selected. Exiting."
fatalError()
}
lessegue.selectedLesson = myLessons[selectedRow]
default:
print("Unrecognized segue. Exiting."
fatalError()
}
}
That syntax creates a switch statement where each case is executed based on the type of the destination view controller, with a built-in cast to the destination type. It's a neat variant of the switch statement that's very useful in prepare(for:) functions.