如何在 SwiftUI 中使用 Form 创建基本的表单设计?

SwiftUI 中的 Form 视图使得创建表单变得简单易行。以下是基本的表单设计步骤：

1. 在主视图 Body 中创建 Form 视图

struct ContentView: View {
    var body: some View {
        NavigationView {
            Form {
                // 表单内容
            }
            .navigationBarTitle("My Form")
        }
    }
}

2. 添加 Section

struct ContentView: View {
    var body: some View {
        NavigationView {
            Form {
                Section(header: Text("Personal Information")) {
                    // Personal Information 表单内容
                }
                
                Section(header: Text("Preferences")) {
                    // Preferences 表单内容
                }
            }
            .navigationBarTitle("My Form")
        }
    }
}

3. 添加表单元素

TextField("Name", text: $name)
Toggle(isOn: $isOn) {
    Text("Label")
}
DatePicker(selection: $date, displayedComponents: .date) {
    Text("Date")
}

完整示例：

struct ContentView: View {
    @State private var name = ""
    @State private var isOn = false
    @State private var date = Date()

    var body: some View {
        NavigationView {
            Form {
                Section(header: Text("Personal Information")) {
                    TextField("Name", text: $name)
                    DatePicker(selection: $date, displayedComponents: .date) {
                        Text("Date of Birth")
                    }

                }

                Section(header: Text("Preferences")) {
                    Toggle(isOn: $isOn) {
                        Text("Receive Notifications")
                    }

                }
            }
            .navigationBarTitle("My Form")
        }
    }
}