I'm trying to learn to make use of ClassModels in swift3, since I couldn't find a proper tutorial to understand the basic concept, I referred to too many sites and succeeded in creating a model class and setting values to the model class' objects from a sample parsed JSON value.
My model class is,
import UIKit
import SwiftyJSON
class TrainObject {
var towards: String!
var lastUpdated: String!
var delay: String!
var trainName: String!
var lastLocation: String!
var trainNo: String!
var upcomingStationInfo: String!
required init(json: JSON) {
lastUpdated = json["lastUpdated"].stringValue
trainName = json["trainName"].stringValue
}
}
Now from ListViewController(UIViewController)'s viewdidload, I parsed JSON from a URL using Alamofire and set the resultant to the model class using the code,
if let results = json["info"]["trainData"].array {
print(results)
for entry in results {
self.items.append(TrainObject(json: entry))
}
print(self.items)
let user = self.items[0]
print(user.trainName)
self.tableOfInfo?.reloadData()
}
Further from the ListViewController's tableview delegate, I got the array values one by one to be loaded in the tableview like,
let user = self.items[indexPath.row]
print(user.trainName)
print(user.delay)
Now on tableview selection, I can pass appropriate value to another UIViewController named DetailsViewController using the usual code. My question is, is there a way to access the model class(TrainObject) directly from the DetailsViewController and then with the selected indexpath.row value, obtain the appropriate array? or should I pass the array itself from tableview's didselectrow method? I get confused here Can you please explain what's the real use of model class? How and where should I actually use it?
You should fetch the item from array when user select a particular item on the tableview. And get the instance of the DetailViewController and pass the selected item to that instance.
For Example :
class DetailViewController: UIViewController {
var selectedTrain : TrainObject?
override func viewDidLoad() {
if let selectedTrain = selectedTrain {
// Selected train not nil.
}
super.viewDidLoad()
}
}
class ListViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let selectedTrain = self.items[indexPath.row]
let detailViewController = // Fetch the instance from Storyboard
detailViewController.selectedTrain = selectedTrain
//Push the detail view controller or present it modally.
}
}