HabitColor 主题色，保存了习惯的主题
public let UserColorArray = [ Color(red:75 / 255, green:166 / 255, blue: 239 / 255), Color(red:161 / 255, green:206 / 255, blue: 97 / 255), Color(red:248 / 255, green:214 / 255, blue: 80 / 255), Color(red:243 / 255, green:176 / 255, blue: 74 / 255), Color(red:238 / 255, green:140 / 255, blue: 111 / 255), Color(red:237 / 255, green:113 / 255, blue: 165 / 255), Color(red:207 / 255, green:102 / 255, blue: 247 / 255), Color(red:77 / 255, green:110 / 255, blue: 247 / 255), Color(red:236 / 255, green:107 / 255, blue: 102 / 255) ]HabitIconArray 习惯的图标库
public let IconNameArray: [String] = [ "alarm", "book", "pencil", "desktopcomputer", "gamecontroller", "sportscourt", "lightbulb" ]HabitItem 用来保存习惯的详细信息，这里实现 ObservableObject 协议，用来告诉 SwiftUI 这个对象需要监听，用 Published property wrapper 包装了 checkList 属性，表示这个属性是要监听的，因为它可能需要传递给子 View
class HabitItem: Identifiable, ObservableObject { var name: String = "" var iconName: String = "clock" var theme: Color = UserColor.color1.value var uuid: Int = 0 @Published var checkList: [Bool] = [false, false, false, false, false, false, false] init () { } init(name: String, iconName: String, theme: Color) { self.name = name self.iconName = iconName self.theme = theme self.uuid = generatteID() } } UI 设置具体代码参考仓库代码，这里讲解一个流程，新建一个“习惯”项，在 MainView 里
MainView
... @State var sheetVisible: Bool = false @State var sheetType: String = "add" ... ... AddButtonView() { self.sheetType = "add" self.sheetVisible = true } ...AddButtonView 利用尾部闭包语法内联了一个闭包用来相应事件
AddButtonView 里定义了 onPressed 属性
struct AddButtonView: View { var onPressed: () -> Void var body: some View { Button(action: { self.onPressed() }) { HStack { Image(systemName: "plus.circle.fill") .resizable() .frame(width: 60, height: 60) .foregroundColor(Color.blue) } } } }AddItemView 里的新增按钮点击后相应事件，把选中的数据传递 onSumit 属性回调里
struct AddItemView: View { @State var newItemTitle = "" @State var selectIconIndex: Int = 0 @State var selectColorIndex: Int = 0 var onSumit: (HabitItem) -> Void var onDissmis: () -> Void var body: some View { VStack { ... ... VStack { Button(action: { if self.newItemTitle != "" { let iconName = IconNameArray[self.selectIconIndex]; let theme = UserColorArray[self.selectColorIndex]; self.onSumit(HabitItem(name: self.newItemTitle, iconName: iconName, theme: theme)) } }) { Text("新增").frame(minWidth: 0, maxWidth: .infinity) } ... } ... } ... } } }在 MainView 里，利用闭包处理回调事件新增选项
AddItemView(onSumit: { item in self.habitItemList.insert(item, at: 0) self.sheetVisible = false }, onDissmis: { self.sheetVisible = false })剩下的功能大同小异，可以把代码拉下来本地运行看看效果，github: https://github.com/young-cowboy/swiftui-app-habits