Hide Selected Cell from the Table - Swift4 - ios

Question

I have a list with 4 objects of places that I query from my Realm database.
Optional(Results<Place> <0x7feaaea447c0> (
[0] Place {
name = Daniel Webster Highway;
country = United States;
lat = 42.72073329999999;
lon = -71.44301460000001;
},
[1] Place {
name = District Avenue;
country = United States;
lat = 42.48354969999999;
lon = -71.2102486;
},
[2] Place {
name = Gorham Street;
country = United States;
lat = 42.62137479999999;
lon = -71.30538779999999;
},
[3] Place {
name = Route de HHF;
country = Haiti;
lat = 18.6401311;
lon = -74.1203939;
}
))
I'm trying to hide the selected one.
Ex. When I click on Daniel Webster Highway, I don't want that to show on my list.
How would one go above and do that in Swift 4 ?
Code
//
// PlaceDetailVC.swift
// Memorable Places
//
//
import UIKit
import CoreLocation
import RealmSwift
class PlaceDetailVC: UIViewController, UITableViewDelegate, UITableViewDataSource {
#IBOutlet weak var address: UILabel!
#IBOutlet weak var placesTable: UITableView!
var selectedPlace : Place = Place()
var selectedTrip : Trip = Trip()
var distances = [ String ]()
var places : Results<Place>?
override func viewDidLoad() {
super.viewDidLoad()
address.text = selectedPlace.name
//register xib file
placesTable.register(UINib(nibName: "PlaceDetailCell", bundle: nil), forCellReuseIdentifier: "customPlaceDetailCell")
}
override func viewDidAppear(_ animated: Bool) {
load()
if selectedPlace != nil && places != nil {
for i in 0..<places!.count {
let latitude = Double(places![i].lat)
let longitude = Double(places![i].lon)
let currentLatitude = Double(selectedPlace.lat)
let currentLongitude = Double(selectedPlace.lon)
//print(latitude,longitude,currentLatitude,currentLongitude)
let coordinate = CLLocation(latitude: latitude, longitude: longitude)
let currentCoordinate = CLLocation(latitude: currentLatitude, longitude: currentLongitude)
let distanceInMeters = coordinate.distance(from: currentCoordinate) // result is in meters
let distanceInMiles = distanceInMeters/1609.344
distances.append(String(format: "%.2f", distanceInMiles))
}
}
}
// ---------------------------------------------------------------------------------------------------------
//MARK - CRUD functions
//Read
func load() {
places = selectedTrip.places.sorted(byKeyPath: "name", ascending: true)
//print(places,"<<<")
placesTable.reloadData()
}
// ---------------------------------------------------------------------------------------------------------
//MARK - Table View Datasource
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return places?.count ?? 0
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 70
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "customPlaceDetailCell", for: indexPath)
as! CustomPlaceDetailCell
if selectedPlace.name != nil {
cell.address.text = (places![indexPath.row]["name"] as! String)
cell.distance.text = distances[indexPath.row]
}
return cell
}
// ---------------------------------------------------------------------------------------------------------
//MARK - Table View Delegate
func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
return true
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
activePlace = indexPath.row
}
}

Answer 1

var distances = [ String ]()
var places : Results<Place>?
Then in tableView(_:cellForRow:)
cell.address.text = (places![indexPath.row]["name"] as! String)
cell.distance.text = distances[indexPath.row]
Just don't do that. These info need to be synchronized.
Instead, use another class/struct, or an extension which will hold the distance and the place.
var array: [PlaceModel]
struct PlaceModel {
let place: Place
let distance: Double //You can use String, but that's bad habit
//Might want to add the "image link" also?
}
In load():
array.removeAll()
let tempPlaces = selectedTrip.places.sorted(byKeyPath: "name", ascending: true)
for aPlace in tempPlaces {
let distance = //Calculate distance for aPlace
array.append(PlaceModel(place: aPlace, distance: distance)
}
Now, in tableView(_:cellForRow:):
let aPlaceModel = array[indexPath.row]
if activePlace == indexPath {
let cell = tableView.dequeue...
//Use cellWithImage for that place
return cell
} else {
let cell = tableView.dequeue...
cell.address.text = aPlaceModel.place.name
cell.distance.text = aPlaceModel.distance
return cell
}
And keep that logic wherever you want, if the heightForRow if needed (if you want for instance that all your images be at 80pt but the rest at 44pts, etc.
In tableView(_:didSelectRowAt:), add tableView.reloadData(), or better tableView.reloadRows(at: [indexPath] with: .automatic)
NB: Code not tested, might not compile, but you should get the idea.

Answer 2

You could pass the index of the selected row from placesVC to your PlaceDetailVC and in
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
if indexPath.row == passedIndex {
return 0
}
return 70
}
set the cell height to 0 to hide the cell.