Swift - passing data from VC to detail VC with Firestore - ios

Question

I'm totally new to Swift well I have a View Controller, where a uitableview of data is being fetched from the Firestore and I want to send this data from View Controller to detail View Controller. I mean, when a cell in View Controller is clicked, detail View Controller shows such as name, description from Firestore.. is there anyone to help me?
here's HospitalViewController.Swift :
class HospitalViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
struct HospitalData {
var Name: String = ""
var Image: String = ""
var Region: String = ""
func getDic() -> [String:String] {
let dic = [
"Name": self.Name,
"Image": self.Image,
"Region": self.Region
]
return dic
}
}
var hospitalArray: Array<HospitalData> = []
#IBOutlet weak var hospitalTableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
self.navigationController?.isNavigationBarHidden = true
hospitalTableView.delegate = self
hospitalTableView.dataSource = self
}
#IBAction func onBtnRead(_ sender: UIButton) {
getValueFromList()
}
func getValueFromList() {
hospitalArray.removeAll()
let db = Firestore.firestore()
db.collection("Hospital").getDocuments() {
(querySnapshot, err) in
if let error = err {
print("fail", error)
}else{
print("success")
for document in querySnapshot!.documents {
print("\(document.documentID) => \(document.data())")
let dataDic = document.data() as NSDictionary
let Name = dataDic["Name"] as? String ?? ""
print("Name:", Name)
let Image = dataDic["Image"] as? String ?? ""
print("Image:", Image)
let Region = dataDic["Region"] as? String ?? ""
print("Region:", Region)
var hospital = HospitalData()
hospital.Name = Name
hospital.Image = Image
hospital.Region = Region
self.hospitalArray.append(hospital)
}
self.hospitalTableView.reloadData()
}
}
}
func setValueIntoList() {
var hospital = HospitalData()
hospital.Name = "SUN Hospital"
hospital.Image = "hospital.png"
hospital.Region = "Seoul"
let dic = hospital.getDic()
let db = Firestore.firestore()
var ref: DocumentReference? = nil
ref = db.collection("Hospital").addDocument(data: dic) {
err in
if let error = err {
print("fail", error)
}else{
print("success", ref!.documentID)
}
}
}
// mark: datasource
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.hospitalArray.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = hospitalTableView.dequeueReusableCell(withIdentifier: "hosptialTableViewCell", for: indexPath) as! HospitalTableViewCell
let hospitalStruct = self.hospitalArray[indexPath.row]
cell.labelName.text = hospitalStruct.Name
cell.labelRegion.text = hospitalStruct.Region
cell.hospitalImageView.image = UIImage(named: "hospital.png")
return cell
}

Answer 1

To navigate from one viewcontroller to others you can use the basic push navigation as bellow
let viewController = UIStoryboard.init(name: "YOUR_STORYBOARD", bundle: Bundle.main).instantiateViewController(withIdentifier: "YOUR_VC_IDENTIFIER") as? YOUR_VC
self.navigationController?.pushViewController(viewController, animated: true)
Now to pass data from one view to the viewcontroller you would like to move you have to declare a variable on the viewcontroller you would like to move.
i.e
You need to have a variable in your detail vc.
hospital_detail_vc.swift
var hospitalData: HospitalData?
Now you need to pass the data/variable as below through the navigation in your TableView's method didSelectRowAt as below.
let viewController = UIStoryboard.init(name: "YOUR_STORYBOARD", bundle: Bundle.main).instantiateViewController(withIdentifier: "YOUR_VC_IDENTIFIER") as? YOUR_VC
viewController.hospitalData = self.hospitalArray[indexPath.row]
self.navigationController?.pushViewController(viewController, animated: true)
Happy coding :)