Passing JSON to another view controller - json

Question

I'm having a hard time trying to pass JSON to another view controller using a segue. So for I have only been able to use prepare(for segue, sender), but I can't get my data to populate my outlets on my view controller. Below is my first view controller. Within the prepare(for segue, sender) method you can see my commented out code that's not working. Any advice?
class ViewController2 : UIViewController, UITableViewDelegate, UITableViewDataSource {
var pictures : [Hit] = []
#IBOutlet weak var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
tableView.delegate = self
tableView.dataSource = self
NetworkMananger.shared.getInfo { [weak self] (results) in
guard let self = self else {return }
switch results {
case .failure(let error):
print(error)
case .success(let pictures):
self.pictures = pictures
DispatchQueue.main.async {
self.tableView.reloadData()
}
}
}
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "ViewController1"{
if let indexPath = self.tableView.indexPathForSelectedRow{
let vc = segue.destination as! ViewController1
// vc.downloadLabel = String(pictures[indexPath.row].downloads)
// vc.tagsLabel = pictures[indexPath.row].tags
// vc.imageData = UIImage(named: pictures[indexPath.row].previewURL)
}
}
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let vc = storyboard?.instantiateViewController(identifier: "ViewController1") as? ViewController1
navigationController?.pushViewController(vc!, animated: true)
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return pictures.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell123", for: indexPath) as! firstTableViewCell
cell.label?.text = String(pictures[indexPath.row].downloads)
cell.downloadPictureFromURL(from: pictures[indexPath.row].previewURL)
return cell
}
}
Below is my second view controller I want to pass my JSON to :
class ViewController1: UIViewController {
var picture : Hit!
#IBOutlet weak var label: UILabel!
#IBOutlet weak var imageData:
UIImageView!
#IBOutlet weak var tagsLabel: UILabel!
#IBOutlet weak var downloadLabel: UILabel!
var cap : String = ""
override func viewDidLoad() {
super.viewDidLoad()
}
}
JSON
struct Response : Codable {
let hits : [Hit]
}
struct Hit : Codable {
let tags : String
let previewURL : String
let downloads : Int
}

Answer 1

There are a couple of things getting in your way:
Right now, in your commented code, you have a type mismatch with each property you're trying to set. For example, you're trying to set a String to downloadLabel, which is a UILabel.
At the time of prepareForSegue, the IBOutlets may not be loaded.
To get around these issues, you could set properties on ViewController1 and then initialize the views in viewDidLoad:
struct ViewController1Input {
var downloadLabelText : String
var tagsLabelText: String
var imageName: String
}
class ViewController1: UIViewController {
var picture : Hit! //careful here -- I'm not sure where this is coming from and you aren't setting it in your segue
var input : ViewController1Input?
#IBOutlet weak var label: UILabel!
#IBOutlet weak var imageData: UIImageView!
#IBOutlet weak var tagsLabel: UILabel!
#IBOutlet weak var downloadLabel: UILabel!
var cap : String = ""
override func viewDidLoad() {
super.viewDidLoad()
if let input = input {
downloadLabel.text = input.downloadLabelText
tagsLabel.text = input.tagsLabelText
imageData.image = UIImage(named: input.imageName)
}
}
}
And in your segue:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "ViewController1"{
if let indexPath = self.tableView.indexPathForSelectedRow{
let vc = segue.destination as! ViewController1
vc.input = ViewController1Input(downloadLabelText: String(pictures[indexPath.row].downloads),
tagsLabelText: pictures[indexPath.row].tags,
imageName: pictures[indexPath.row].previewURL)
}
}
}