//
//  hackingwithswiftApp.swift
//  hackingwithswift
//
//  Created by 方君宇 on 2024/9/4.
//

import SwiftUI
import SwiftData
@main

struct hackingwithswiftApp: App {
    @State private var container: ModelContainer
    init() {
        container = try! ModelContainer(for: Person.self)
    }
    
    var body: some Scene {
        WindowGroup {
            ContentView()
                .modelContainer(container)
            
        }
    }
}
//
//  Person.swift
//  hackingwithswift
//
//  Created by 方君宇 on 2024/11/24.
//

import Foundation
import SwiftData

@Model
class Person {
    var name: String
    var age: Int
    
    init(name: String, age: Int) {
        self.name = name
        self.age = age
    }
}
//
//  ContenView.swift
//  hackingwithswift
//
//  Created by 方君宇 on 2024/11/24.
//

import SwiftUI
import SwiftData

struct ContentView: View {
    @Environment(\.modelContext) private var context
    @Query var adults: [Person]
    @State private var selectAge: Int = 18
    var body: some View {
        NavigationStack {
            VStack {
                // 列表展示查询结果
                List {
                    Section("人员名单") {
                        ForEach(adults, id: \.self) { person in
                            Text("\(person.name)，年龄：\(person.age)")
                        }
                    }
                }
                .frame(height: 330) // 限制列表的高度
                VStack {
                    Text("筛选结果页面（比如年龄大于 \(selectAge) 的人员）")
                    Picker("选择年龄", selection: $selectAge) {
                        ForEach(1...100, id: \.self) { age in
                            Text("\(age)").tag(age)
                        }
                    }
                    .pickerStyle(WheelPickerStyle())
                    NavigationLink(value:selectAge) {
                        Text("查询")
                            .frame(maxWidth: 300)
                            .padding()
                            .background(Color.blue)
                            .foregroundColor(.white)
                            .cornerRadius(10)
                    }
                }
                Spacer()
            }
            .navigationTitle("列表")
            .navigationDestination(for: Int.self) { age in
                PersonDetailView(age: age)
            }
            .toolbar {
                ToolbarItem(placement: .navigationBarTrailing) {
                    Button("添加测试数据") {
                        try? context.delete(model: Person.self)
                        context.insert(Person(name: "李四", age: 7))
                        context.insert(Person(name: "章三", age: 58))
                        context.insert(Person(name: "王五", age: 24))
                        context.insert(Person(name: "北方", age: 47))
                        context.insert(Person(name: "卫子夫", age: 15))
                        context.insert(Person(name: "鸥玉", age: 35))
                    }
                }
            }
        }
    }
}

#Preview {
    ContentView()
        .modelContainer(for: Person.self)
}

//
//  PersonDetailView.swift
//  hackingwithswift
//
//  Created by 方君宇 on 2024/11/24.
//

import SwiftUI
import SwiftData

struct PersonDetailView: View {
    @Environment(\.modelContext) private var context
    @Query var adults: [Person]
    
    init(age: Int) {
        _adults = Query(filter: #Predicate<Person> {
            $0.age > age
        })
    }
    var body: some View {
        List(adults) { user in
            HStack {
                Text("姓名：\(user.name)，")
                Text("年龄：\(user.age)")
            }
        }
    }
}

#Preview {
    PersonDetailView(age:0)
        .modelContainer(for: Person.self)
}