This is a SwiftUI Demo for iOS15 & Xcode13

Previews

Most screenshot is youtube link

lesson1 = "Hello World"

lesson2 = "LaunchView"

lesson3 = "Modifier"

lesson4 = "View Stack"

lesson5 = "Text"

lesson6 = "Image"

lesson7 = "Button"

lesson8 = "Input"

lesson9 = "Picker"

lesson10 = "Date Picker"

lesson11 = "Alert"

lesson12 = "Toggle, Slider, Stepper, Context Menu and Disclosure"

lesson13 = "Color"

lesson14 = "Shape"

lesson15 = "Group, GroupBox, Spacer, ProgressView, Card"

lesson16 = "Layout"

lesson17 = "image Picker"

lesson18 = "ScrollView"

lesson19 = "List (1/3)"

lesson20 = "List (2/3)"

lesson21 = "List (3/3)"

lesson22 = "Grid"

lesson23 = "Navigation"

lesson24 = "TabView (A side)"

lesson25 = "TabView (B side)"

lesson26 = "Life cycle & AppStorage"

lesson27 = "call RESTful API"

lesson28 = "Multiplatform"

lesson29 = "Environments"

Compare

Flutter	SwiftUI
Padding	.padding
SizedBox	.frame
Align	.frame
Positioned	.offset
(Widget property)	.foregroundColor
Container color	.background
Container decoration	.border
Column	VStack
Row	HStack
Stack	ZStack/.overlay()
Switch	Toggle
Slider	Slider
DropdownButton	Stepper
Positioned	.contextMenu
ExpansionTile	DisclosureGroup
Divider	Divider
VerticalDivider	X
Spacer	Spacer
ProgressView(菊花)	CircularProgressIndicator
ProgressView(進度條)	LinearProgressIndicator
Card	X
GeometryReader	LayoutBuilder
UIScreen	MediaQuery
EmptyView	Container without child

UIKit	Flutter	SwiftUI
UITapGestureRecognizer	GestureDetector	.onTapGesture
UIScrollView	SingleChildScrollView	ScrollView
openUrl	url_launcher	Link
UINavigationController	Navigator	NavigationView
present	modal_bottom_sheet	.sheet
present modalPresentationStyle = .fullScreen	CupertinoPageRoute fullscreenDialog	.fullScreenCover

Android	UIKit	Flutter	SwiftUI
TextView	UILabel	Text
Button	UIButton	RawMaterialButton	Button
EditText	UITextField	TextField	TextField
EditText	UITextView	TextField	TextEditor
Dialog	UIAlertController	AlertDialog	Alert
ListView	UITableView static cell	ListView use children	List with content
RecycleView	UITableView dynamic cell	ListView.builder	List with data
RecycleView(set GridLayoutManager)	UICollectionView	GridView	LazyVGrid & LazyHGrid
BottomNavigationView	UITabBarController	BottomNavigationBar	TabView
TabbedActivity	UIPageViewController	TabController	TabView.tabViewStyle(.page)
WillEnterForeground	onRestart
DidBecomeActive	onStart	resumed	active
WillResignActive	onPause		inactive
DidEnterBackground	onStop	paused	background
init	onCreate	createState	init
viewDidLoad		initState
viewWillAppear	onStart		.onAppear()
viewDidLayoutSubviews		build	body
viewDidAppear	onResume
viewWillDisappear	onPause
viewDidDisappear	onStop		.onDisappear()
removeFromSuperview		deactivate
deinit	onDestroy	dispose
UserDefault	SharedPreferences	SharedPreferences	AppStorage

Android	UIKit	Flutter(Material)	Flutter(Cupertino)	SwiftUI
Spinner	UIPickerView	showBottomSheet	CupertinoActionSheet	Picker
DatePickerDialog	UIDatePicker	showDatePicker/showTimePicker	CupertinoDatePicker	DatePicker