Swift

export PATH=/Library/Developer/Toolchains/swift-latest.xctoolchain/usr/bin:"${PATH}"

Hello World

import UIKit

class ViewController: UIViewController {
    
    @IBOutlet weak var nameTexField: UITextField!
    @IBOutlet weak var ageTextField: UITextField!
    @IBOutlet weak var helloLabel: UILabel!
    

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    @IBAction func clickMeAction(_ sender: Any) {
        print("Hello \(nameTexField.text!)");
        helloLabel.text = "Hello \(nameTexField.text!), your age is \(ageTextField.text!)";
    }
}

Alert & Action

import UIKit

class ViewController: UIViewController {
    
    @IBOutlet weak var nameTexField: UITextField!
    @IBOutlet weak var ageTextField: UITextField!
    @IBOutlet weak var helloLabel: UILabel!
    

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    @IBAction func clickMeAction(_ sender: Any) {
        print("Hello \(nameTexField.text!)")
        helloLabel.text = "Hello \(nameTexField.text!), your age is \(ageTextField.text!)"
    }
    
    @IBAction func showAlertAction(_ sender: UIButton) {
        let alertCtrl = UIAlertController(title: "Alert", message: "Hello Alert", preferredStyle: .alert)
        let destructiveAction = UIAlertAction(title: "Delete", style: .destructive, handler: nil)
        let cancelAction = UIAlertAction(title: "Cancel", style: .default, handler: nil)
        let okAction = UIAlertAction(title: "OK", style: .cancel, handler: nil)
        alertCtrl.addAction(okAction)
        alertCtrl.addAction(cancelAction)
        alertCtrl.addAction(destructiveAction)
        present(alertCtrl, animated: true, completion: nil)
    }
    
    @IBAction func showConfirmAction(_ sender: UIButton) {
        let actionSheet = UIAlertController(title: "Hello World", message: "This is an Action Sheet", preferredStyle: .actionSheet)
        let cancelAction = UIAlertAction(title: "Cancel", style: .cancel, handler: nil)
        let okAction = UIAlertAction(title: "OK", style: .default, handler: nil)
        actionSheet.addAction(okAction)
        actionSheet.addAction(cancelAction)
        present(actionSheet, animated: true, completion: nil)
    }
}

Playground

import UIKit

var hello = "Hello, playground"
print(hello)

// 1) constrant vs variable
var name = "Raiyan Bin Shahed" //mutable and variable
let greetings = "Hello"        //immutable and constrant
let message = greetings + name
print(message)

name = "Shahed Hossain"
print(name)

// 2) Implicit vs Explicit typing
let huaweiPrice:Double = 2999 //Explicit Typing
let deliveryCharge = 9.99     //Implicit Typing
let totalPrice = huaweiPrice + deliveryCharge
print(totalPrice)

// 3) If else in Swift
// No need to end statement in semicolon (optional)
// Conditional bracket is optional
// The curly bracket is compulsary even it is for one liner statement
let hungry = true
if hungry {
    print("Let's have a break now")
}
else {
    print("Let's have a break in 15 minutes")
}


// 4) Array and For Loop
var myArray = [2, 4, 6, 8, 10]
myArray.append(12) //add item
print(myArray.count) // length
print(myArray[1]) //accessing 2nd item by index


// 4) For Loop in Swift
//  collection for loop
for item in myArray {
    print(item)
}

// incrementaql for loop
for i in 0..<myArray.count {
    print("Item \(i) is \(myArray[i])") //interpolation
}

// 5) Dictionary
let myInfo    = ["name": "Shahed Hossain", "city": "KLC", "phone": "01117606778", "email": "eng.shahed@gmail.com"]
let mySonInfo = ["name": "Raiyan Bin Shahed", "city": "KLC", "phone": "01117606778"]
// When we get a value from dictionary, we will get optional data type,
// Since it can be nil or it can eturn a value
print(myInfo["name"])
print(mySonInfo["email"])

// To get the value, you can use
// 5.1) Optional Binding
// Have to write more code but null safe
// Safe for runtime as well as production
if let newVar = myInfo["name"] {
    print(newVar)
}

// 5.2) Force unwrap
print(myInfo["name"]!) // easy to write but not null safe

Inheritance

import UIKit

var hello = "Hello, playground"
print(hello.suffix(10))
print(hello)

class BaseCalculator : NSObject {
    var a:Int
    var b:Int

    init(a:Int, b:Int){
        self.a = a
        self.b = b
    }

    func add() -> Int {
        return self.a + self.b
    }

    func printAdd(){
        print("a + b = \(self.add())")
    }
}

class SubCalculator: BaseCalculator {

    func sub() -> Int {
        return self.a - self.b
    }

    func printSub(){
        print("a - b = \(self.sub())")
    }

}

let baseCal = BaseCalculator(a:10, b:20)
print(baseCal.add())
baseCal.printAdd()

let subCal = SubCalculator(a:20, b:10)
print(subCal.add())
subCal.printAdd()

print(subCal.sub())
subCal.printSub()

Switcher and Slider

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var priceFilter: UISwitch!
    @IBOutlet weak var priceSlider: UISlider!
    @IBOutlet weak var priceLabel: UILabel!
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
    }


    @IBAction func switchFilterAction(_ sender: UISwitch) {
        if priceFilter.isOn {
            priceSlider.isEnabled = true
            priceLabel.isHidden = false
            priceLabel.text = String(format:"%2.2f", priceSlider.value)
        }
        else {
            priceSlider.isEnabled = false
            priceLabel.isHidden = true
        }
    }
    
    
    @IBAction func whenPriceUpdated(_ sender: UISlider) {
        priceLabel.text = String(format:"%2.2f", priceSlider.value)
    }
}

Table View

import UIKit

class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
    
    @IBOutlet weak var tableView: UITableView!
    
    var items:[ToDoItem] = []
    
    override func viewDidLoad() {
        super.viewDidLoad()
        let tea = ToDoItem(itemName: "Tea", itemDesc: "Tea Break 20 min", itemPlace: "iTrain")
        let coffee = ToDoItem(itemName: "Coffee", itemDesc: "Coffee Break 20 min", itemPlace: "iTrain")
        let lunch = ToDoItem(itemName: "Lunch", itemDesc: "Lunch Break 50 min", itemPlace: "KFC")
        let dinner = ToDoItem(itemName: "Dinner", itemDesc: "Dinner Break 50 min", itemPlace: "MAC")
        let suffer = ToDoItem(itemName: "Suffer", itemDesc: "Suffer Break 30 min", itemPlace: "Home")
        
        tea.completed = true
        coffee.completed = true
        
        items.append(tea)
        items.append(coffee)
        items.append(lunch)
        items.append(dinner)
        items.append(suffer)
    }
    
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return items.count
//      return 5
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
        cell.textLabel?.text = items[indexPath.row].itemName
        if items[indexPath.row].completed {
            cell.imageView?.image =  UIImage(named: "checked.png")
        }
        else {
            cell.imageView?.image =  UIImage(named: "unchecked.png")
        }
//      cell.textLabel?.text = "Hello World"
        return cell
    }

    @IBAction func onAddItemAction(_ sender: UIBarButtonItem) {
        let promptController = UIAlertController(title: "Add Item", message: "Please Add an Item", preferredStyle: .alert )
        
        promptController.addTextField{(textField) in
            textField.placeholder = "Item name"
        }
        
        promptController.addTextField{(textField) in
            textField.placeholder = "Item Description"
        }
        
        promptController.addTextField{(textField) in
            textField.placeholder = "Item Place"
        }
        
        
        let addAction = UIAlertAction(title: "Add", style: .default){(alert) in
            let textFields = promptController.textFields!
            let name  = textFields[0].text!
            let desc  = textFields[1].text!
            let place = textFields[2].text!
            
            let item = ToDoItem(itemName: name, itemDesc: desc, itemPlace: place)
            self.items.append(item)
            self.tableView.reloadData()
        }
        
        let cancelAction = UIAlertAction(title: "Cancel", style: .cancel, handler: nil)
        
        promptController.addAction(cancelAction)
        promptController.addAction(addAction)
        
        present(promptController, animated: true, completion: nil)
    }
    
}

Memo or Todo

// Example of Alert with Input Field
class ViewController: UIViewController {

    @IBOutlet weak var tableView: UITableView!
    var items:[ToDoItem] = []

    @IBAction func onAddItemAction(_ sender: UIBarButtonItem) {
        let promptController = UIAlertController(title: "Add Item", message: "Please Add an Item", preferredStyle: .alert )
        
        promptController.addTextField{(textField) in
            textField.placeholder = "Item name"
        }
        promptController.addTextField{(textField) in
            textField.placeholder = "Item Description"
        }
        promptController.addTextField{(textField) in
            textField.placeholder = "Item Place"
        }
        
        let addAction = UIAlertAction(title: "Add", style: .default){(alert) in
            let textFields = promptController.textFields!
            let name  = textFields[0].text!
            let desc  = textFields[1].text!
            let place = textFields[2].text!
            
            let item = ToDoItem(itemName: name, itemDesc: desc, itemPlace: place)
            self.items.append(item)
            self.tableView.reloadData()
        }
        
        let cancelAction = UIAlertAction(title: "Cancel", style: .cancel, handler: nil)
        promptController.addAction(cancelAction)
        promptController.addAction(addAction)
        present(promptController, animated: true, completion: nil)
    }

}

Cocoa Pods

pod --version
pod repo update
cd /opt/dev/cki_workspaces/
cd ./init_workspace/chorke-init-iosapp/
pod init
vim Podfile 
pod install

Exception

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <!-- exception ini -->
    <key>NSAppTransportSecurity</key>
    <dict>
        <key>NSExceptionDomains</key>
        <dict>
            <key>dev.chorke.org</key>
            <dict>
                <key>NSExceptionAllowsInsecureHTTPLoads</key>
                <true/>
            </dict>
        </dict>
    </dict>
    <!-- exception end -->
</dict>
</plist>

Features

1. Closures unified with function pointers
2. Tuples and multiple return values
3. Generics
4. Fast and concise iteration over a range or collection
5. Structs that support methods, extensions, and protocols
6. Functional programming patterns, e.g., map and filter
7. Powerful error handling built-in
8. Advanced control flow with do, guard, defer, and repeat keywords

References

Convert JSON to Swift objects using Codable iOS App Transport Security Exception Cocoa Pods Playground How to Swift LLVM, Swift Docker Swift, Swift Clang Hacking With Swift Swift Cheat Sheet iSwift Playground iOS Chat Tutorial Ray Wender Lich

Get a Popup Dialog Box in Swift Playgrounds Swift Community Training Manual Download Swift Swift Custom UI Cocoa Pods SQLite.swift About Swift AppCoda CS193P

Marvel API