lucianoschillagi

import Foundation

// Swift Standard Library - Exploring its methods!
// The 'precondition' method.

let faceWithSunglasses: Character = "🙂"
//let faceWithSunglasses: Character = "😎"

// if this precondition is not true, the program will be interrupted
precondition(faceWithSunglasses == "😎",

lucianoschillagi

import SwiftUI

@main
struct MyApp: App {
    
    @Environment(\.scenePhase) var scenePhase

    var body: some Scene {
        WindowGroup {
            ContentView()

lucianoschillagi

/*
If you need more control over app termination, you can integrate UIApplicationDelegate methods within SwiftUI. 
In particular, applicationWillTerminate gets called right before the app is terminated, 
but it won’t be called if the user force quits the app.

To use this in SwiftUI:

Create an AppDelegate class that conforms to UIApplicationDelegate.
Use UIApplicationDelegateAdaptor to link it to your SwiftUI app.
*/

lucianoschillagi

import SwiftUI

struct ContentView: View {
    
    var body: some View {
        Link("Go to 'Link' documentation",
             destination: URL(string: "https://developer.apple.com/documentation/swiftui/link")!)
    }
}

lucianoschillagi

import SwiftUI

struct ContentView: View {
    
    // @Environment: A property wrapper that reads a value from a view’s environment.
    
    // Access the 'colorScheme' from the environment
    // The current 'colorScheme' used by the system.
    @Environment(\.colorScheme) var colorScheme
    

lucianoschillagi

import SwiftUI

struct ContentView: View {
    let myView = "I am a draggable view!"
    
    var body: some View {
        Text(myView)
            .font(.title)
            .draggable(myView)
    }

lucianoschillagi

import SwiftUI

struct CalendarView: View {
    
    @Environment(\.calendar) var calendar // Access the user's calendar environment value
    
    // Computed property to get the current date in the user's calendar
    var currentDateInUserCalendar: String {
        let formatter = DateFormatter()
        formatter.calendar = calendar  // Use the user's calendar

lucianoschillagi

import Foundation

struct Cat {
//    func saySomething() -> String {
//        return "Muuu! I mean 'Miau!'"
//    }
    
    // Now, I am going to convert this method into a computed property
    var saySomething: String {
        return "Muuu! I mean 'Miau!'"

lucianoschillagi

import Foundation

// Converting JSON into data
let json = """
{
    "name": "Dog",
    "legs": 4
}
""".data(using: .utf8)!

lucianoschillagi

import SwiftUI

struct ContentView: View {
    
    @Environment(\.myCustomValue) private var myCustomValue
    
    var body: some View {
        Text(myCustomValue).font(.title2)
    }
}