Koshimizu-Takehito

import SwiftUI

struct ContentView: View {
    @StateObject private var viewModel = RectsViewModel()

    var body: some View {
        GeometryReader { geometry in
            TimelineView(.animation) { timeline in
                Canvas {context, size in
                    let rects = viewModel.rects

Koshimizu-Takehito

import SwiftUI

struct ContentView: View {
    @State private var date = ISO8601DateFormatter().date(from: "2025-01-01T00:00:00+09:00")!
    @State private var code: LanguageCode = .japanese
    @State private var timeZoneID: TimeZoneID = .jst
    @State private var calendarName: CalendarName = .gregorian

    var body: some View {
        NavigationStack {

Koshimizu-Takehito

import SwiftUI
import UIKit

extension UIDatePicker.Mode {
    static var fallbackYearAndMonth: Self {
        if #available(iOS 17.4, *) {
            .yearAndMonth
        } else {
            .init(rawValue: 4269) ?? .date
        }

Koshimizu-Takehito

import SwiftUI

#Preview {
    @Previewable @State var value: Double = 3.0
    VStack {
        SampleView()
            .environment(\.dynamicTypeSize, .allCases[Int(value)])
            .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .trailing)
            .contentTransition(.numericText())
        Text("\(DynamicTypeSize.allCases[Int(value)])")

Koshimizu-Takehito

import SwiftUI

struct ContentView: View {
    @State var value: Double = 4.0
    let text = Text("Hello")

    var body: some View {
        VStack {
            Grid(alignment: .leading) {
                GridRow {

Koshimizu-Takehito

import SwiftUI

struct ContentView: View {
    @State var isDark = false
    @State var currenct = ColorScheme.light
    @Environment(\.colorScheme) var environment

    var body: some View {
        NavigationStack {
            Form {

Koshimizu-Takehito

import UIKit
import SwiftUI

class SampleViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()

        let traits = [UITraitPreferredContentSizeCategory.self]
        registerForTraitChanges(traits) { (self: Self, _) in
            self.view.invalidateIntrinsicContentSize()

Koshimizu-Takehito

import SwiftUI

// Xcode: 16.0
// Swift: 6.0
struct EnumPicker<Enum>: View where Enum: CaseIterable & Hashable, Enum == Enum.AllCases.Element, Enum.AllCases: RandomAccessCollection {
    @Binding var selection: Enum

    var body: some View {
        Picker(String(describing: Enum.self), selection: $selection) {
            ForEach(Enum.allCases, id: \.self) { value in

Koshimizu-Takehito

import SwiftUI

struct ContentView: View {
    @State var ratio: Double = 0

    var body: some View {
        ZStack {
            Color(hue: 1, saturation: 0.3, brightness: 1)
                .hueRotation(.degrees(360 * ratio))
                .ignoresSafeArea()

Koshimizu-Takehito

import SwiftUI

struct ContentView: View {
    @ViewBuilder
    private func leftHandSide() -> some View {
        HelloWorld()
            .clipShape(Rectangle())
        HelloWorld()
            .clipShape(RoundedRectangle(cornerRadius: 20))
        HelloWorld()