bobleesj

Getting Started RxSwift with Bob

Why Learn Reactive Programming with RxSwift

Motivation

I'd like to begin this article by sharing my frustration with a pool of misleading and often "this is how it just works" articles floating around the internet. I'm tired of seeing myself getting tired after having read through the first 10 pages of the Google search.

I've conducted over 1000+ survey results from the iOS developers and students. RxSwift has been brought up often times. Yet, most of them tend not to use this framework for there is a steep learning curve.

Now I see why. There aren't many people who can explain the concept using analogy and stories. You've come to the right place. I've decided to get my hands dirty with RxSwift and contribute to this phenomenal community.

bobleesj

// Define Error Type 
enum CourseError: Error {
 case noName
}

// Create Structure
struct UdemyCourse {
 let courseName: String
 init(name: String) throws {
  if name == “” { throw CourseError.noName }

bobleesj

class BuzzableTextField: UITextField, Buzzable {}
class BuzzableButton: UIButton, Buzzable {}
class BuzzableImageView: UIImageView, Buzzable {}
class BuzzablePoppableLabel: UILabel, Buzzable, Poppable {}

class LoginViewController: UIViewController {
  @IBOutlet weak var passcodTextField: BuzzableTextField!
  @IBOutlet weak var loginButton: BuzzableButton!
  @IBOutlet weak var errorMessageLabel: BuzzablePoppableLabel!
  @IBOutlet weak var profileImageView: BuzzableImageView!

bobleesj

class BuzzableTextField: UITextField, Buzzable {}
class BuzzableButton: UIButton, Buzzable {}
class BuzzableImageView: UIImageView, Buzzable {}
class BuzzablePoppableLabel: UILabel, Buzzable, Poppable {}

class LoginViewController: UIViewController {
  @IBOutlet weak var passcodTextField: BuzzableTextField!
  @IBOutlet weak var loginButton: BuzzableButton!
  @IBOutlet weak var errorMessageLabel: BuzzablePoppableLabel!
  @IBOutlet weak var profileImageView: BuzzableImageView!

bobleesj

func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
 if editingStyle == .delete {
   let task = tasks[indexPath.row]
   context.delete(task)
   (UIApplication.shared.delegate as! AppDelegate).saveContext()
   
   do {
     tasks = try context.fetch(Task.fetchRequest())
   } catch {
     print("Fetching Failed")

bobleesj

func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
 if editingStyle == .delete {
   let task = tasks[indexPath.row]
   context.delete(task)
   (UIApplication.shared.delegate as! AppDelegate).saveContext()
   
   do {
     tasks = try context.fetch(Task.fetchRequest())
   } catch {
     print("Fetching Failed")

bobleesj

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
 let cell = UITableViewCell()
 let task = tasks[indexPath.row]
 
 if let myName = task.name {
  cell.textLabel?.text = myName
  }
  return cell
}
 func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

bobleesj

class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {

 @IBOutlet weak var tableView: UITableView!
 let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
 var tasks: [Task] = []
  
 override func viewDidLoad() {
 super.viewDidLoad()
  tableView.delegate = self
  tableView.dataSource = self

bobleesj

func saveContext () {
 let context = persistentContainer.viewContext
 if context.hasChanges {
 
  do {
  try context.save()
  } catch {
   let nserror = error as NSError
   fatalError("Unresolved error \(nserror), \(nserror.userInfo)")
 }

bobleesj

class AddTaskViewController: UIViewController {
 @IBOutlet weak var taskTextField: UITextField!
 override func viewDidLoad() {
 super.viewDidLoad()
}
 @IBAction func buttonTapped(_ sender: UIButton) {
  let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
  let task = Task(context: context) // Link Task & Context
  task.name = taskTextField.text!