Updating row's label based of web service implementation swift

Question

I have a table view with 7 rows Monday, Tuesday,....,Sunday. My app receives a json from a web service which is of format:

  ({
  appointments = (
                       


        

Answer 1

Assumptions

First of all, the json sample you posted is not valid json, but rather the output you would see in the debugger. I'm assuming the json will be something similar to the following format:

{
  "appointments": [
    {
      "numApts": 1,
      "title": "Coffee",
      "scheduleDate": "2015-11-02"
    },
    {
      "numApts": 2,
      "title": "Shower",
      "scheduleDate": "2015-11-04"
    },
    {
      "numApts": 3,
      "title": "Rollercoaster!!!!",
      "scheduleDate": "2015-12-24"
    }
  ]
}

TL;DR

I would recommend that you create an Appointment model which represents a single appointment. You should then create a wrapper around which stores all of the appointments, filtered according to the week day. You can name this wrapper whatever you find appropriate for your project.

Code example

I've tried to put together the most simplest case for what you want to implement. Hopefully the naming used in the code is descriptive enough to explain itself.

I think this will be plenty of help to answer your question and to get you going from here. The output of my code will be something similar to the following image:

Now, I need to highlight that there's a bit of force unwrapping here and there that you need to be aware, before you start using something like this in production.

Appointment.swift:

//
//  Appointment.swift
//  WeekDays
//
//  Created by Stefan Veis Pennerup on 02/11/15.
//  Copyright © 2015 Kumuluzz. All rights reserved.
//

import Foundation

struct Appointment {

    // MARK: - Formatter

    private static var DateFormatter: NSDateFormatter = {
        let formatter = NSDateFormatter()
        formatter.dateFormat = "yyyy-MM-dd"
        return formatter
    }()

    // MARK: - Properties

    let numApts: Int
    let title: String
    let scheduleDate: NSDate

    // MARK: - Initializers

    init(json: [String: AnyObject]) {
        numApts = json["numApts"] as? Int ?? 0
        title = json["title"] as? String ?? ""
        let dateString = json["scheduleDate"] as? String ?? ""
        scheduleDate = Appointment.DateFormatter.dateFromString(dateString) ?? NSDate()
    }
}

---

WeekDaysModel.swift:

//
//  WeekDays.swift
//  WeekDays
//
//  Created by Stefan Veis Pennerup on 02/11/15.
//  Copyright © 2015 Kumuluzz. All rights reserved.
//

import Foundation

enum WeekDay: Int {
    // Sunday has been set as the initial index, because the NSDateComponents
    // has been created with Sunday as the initial day with an index of 1. 
    // This is being taken into consideration in the getWeekDayIndexForDate()
    case Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday
}

struct WeekDaysModel {

    // MARK: - Properties

    var appointments: [WeekDay: [Appointment]] = [
        WeekDay.Monday:[],
        WeekDay.Tuesday:[],
        WeekDay.Wednesday:[],
        WeekDay.Thursday:[],
        WeekDay.Friday:[],
        WeekDay.Saturday:[],
        WeekDay.Sunday:[]
    ]

    // MARK: - Initializers

    init() {}

    init(json: [String: AnyObject]) {
        // Ensures there is data
        guard let appointmentsJson = json["appointments"] as? [[String: AnyObject]] else {
            return
        }

        // Parses the data points to the Appointment model
        let apts = appointmentsJson.map { json in
            return Appointment(json: json)
        }

        // Assigns each Appointment to a weekday
        _ = apts.map { apt in
            let i = getWeekDayIndexForDate(apt.scheduleDate)
            appointments[WeekDay(rawValue: i)!]! += [apt]
        }        
    }

    // MARK: - Helpers

    private func getWeekDayIndexForDate(aDate: NSDate) -> Int {
        let cal = NSCalendar(identifier: NSCalendarIdentifierGregorian)!
        let comp = cal.components(.Weekday, fromDate: aDate)
        return (comp.weekday - 1)
    }  
}

---

ViewController.swift:

//
//  ViewController.swift
//  WeekDays
//
//  Created by Stefan Veis Pennerup on 02/11/15.
//  Copyright © 2015 Kumuluzz. All rights reserved.
//

import UIKit

class ViewController: UITableViewController {

    // MARK: - Properties

    private var model = WeekDaysModel() {
        didSet {
            tableView.reloadData()
        }
    }

    // MARK: - Lifecycle methods

    override func viewDidLoad() {
        super.viewDidLoad()
        Backend.downloadAppointments{
            self.model = $0
        }
    }

    // MARK: - UITableViewDelegate

    // MARK: - UITableViewDataSource

    override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
        return model.appointments.count
    }

    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return model.appointments[WeekDay(rawValue: section)!]!.count
    }

    override func tableView(tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        return String(WeekDay(rawValue: section)!)
    }

    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCellWithIdentifier("myCell")!
        let apts = model.appointments[WeekDay(rawValue: indexPath.section)!]!
        cell.textLabel?.text = apts[indexPath.row].title
        return cell
    }
}

---

Backend.swift:

//
//  Backend.swift
//  WeekDays
//
//  Created by Stefan Veis Pennerup on 02/11/15.
//  Copyright © 2015 Kumuluzz. All rights reserved.
//

import Foundation
import Alamofire

struct Backend {

    static func downloadAppointments(handler: (WeekDaysModel)->Void) {
        let url = "http://stefanveispennerup.com/so.json"
        Alamofire.request(.GET, url).responseJSON { response in
            // TODO: Check response code, etc..
            if let json = response.result.value as? [String: AnyObject] {
                let model = WeekDaysModel(json: json)
                handler(model)
            }
        }
    }  
}