Ios Dev Skill
by @yhongm
iOS/macOS 开发技能(SwiftUI + UIKit)与 Swift 6.3 语言权威参考合集。覆盖 MVVM/Cocoa 架构、 网络层(URLSession/async-await)、状态管理(@State/@Published/Combine)、依赖注入、 Navigation、性能优化、单元测试/...
clawhub install ios-dev-skill📖 About This Skill
name: ios-dev-skill description: > iOS/macOS 开发技能(SwiftUI + UIKit)与 Swift 6.3 语言权威参考合集。覆盖 MVVM/Cocoa 架构、 网络层(URLSession/async-await)、状态管理(@State/@Published/Combine)、依赖注入、 Navigation、性能优化、单元测试/UI 测试、持久化、App 分发,以及 Swift 完整语法 (类型系统/集合/闭包/协议/泛型/并发)。当用户询问 iOS 开发、SwiftUI、Swift 语法、 Swift 语言任何相关内容时触发。 trigger: iOS 开发|SwiftUI|UIKit|Xcode|Swift 编程|MVVM|iOS 架构|iOS 网络|URLSession|Combine|@State|@Published|iOS 测试|XCTest|Swift 布局|SnapKit|Swift 语法|Swift 类型|Swift 闭包|Swift 泛型|Swift async|Swift await|Swift actor|Swift 代码解释|Swift optional|Swift protocol|Swift struct|Swift class|Swift enum|Swift guard|Swift if let|Swift ??|Swift @escaping|Swift 错误处理|Swift throws|Swift do-catch|Swift 访问控制|Swift extension|Swift 类型转换|Swift Sendable|Swift @propertyWrapper|Swift Property Wrapper|Swift tuple|Swift Optional 解包 tags: - ios - swiftui - uikit - xcode - swift - mvvm - ios-architecture - ios-network hermes: tags: [ios, swiftui, uikit, xcode, swift, mvvm, ios-architecture, ios-network] related_skills: [apple-design, harmonyos-dev] version: "1.0.0" last_updated: "2026-04-23" source: | https://developer.apple.com/documentation/swiftui https://developer.apple.com/documentation/uikit https://developer.apple.com/documentation/xcode https://developer.apple.com/documentation/combine license: MIT
iOS 开发技能
iOS/macOS 应用开发技能,基于 SwiftUI + UIKit。
核心架构
MVVM 架构(SwiftUI)
┌─────────────┐ ┌──────────────┐ ┌─────────────┐
│ View │ ←── │ ViewModel │ ←── │ Model │
│ (SwiftUI) │ │ (ObservableObject) │ │ (Struct) │
└─────────────┘ └──────────────┘ └─────────────┘
@StateObject @Published @State
@ObservedObject @State let
数据流向: 1. View 订阅 ViewModel 的 @Published 属性 2. ViewModel 处理业务逻辑,调用 Model 3. Model 定义数据结构 4. 状态变化自动触发 View 重新渲染
UIKit 架构对比
| 模式 | 适用场景 | 复杂度 | |------|---------|--------| | MVC | 简单页面 | 低 | | MVVM | 中等复杂度 | 中 | | MVP | 需要解耦 View | 中 | | VIPER | 大型模块化 | 高 | | Coordinator | 导航复杂 | 高 |
iOS 生命周期与状态管理
App 生命周期
| 状态 | 触发时机 | 典型用途 |
|------|---------|---------|
| didFinishLaunching | App 启动完成 | 初始化配置 |
| sceneWillEnterForeground | 从后台恢复 | 刷新数据 |
| sceneDidBecomeActive | 获得焦点 | 恢复动画 |
| sceneWillResignActive | 失去焦点 | 暂停任务 |
| sceneDidEnterBackground | 进入后台 | 保存状态 |
SwiftUI 状态修饰符
@State // 值类型,值语义
@StateObject // 引用类型,ObservableObject
@ObservedObject // 外部提供的 ObservableObject
@EnvironmentObject // 环境注入的共享状态
@Published // 属性观察器,自动触发更新
状态管理对比
| 方式 | 适用场景 | 生命周期 |
|------|---------|---------|
| @State | 视图私有 | 随视图 |
| @StateObject | 模型对象 | 随视图 |
| @EnvironmentObject | 跨视图共享 | 随 App |
| @AppStorage | UserDefaults | 持久 |
数据持久化
方案对比
| 方案 | 适用数据量 | 类型 | 线程安全 |
|------|-----------|------|---------|
| UserDefaults | < 1MB | Key-Value | ✅ |
| FileManager | 任意 | 文件 | ❌ |
| PropertyListEncoder | 中等 | 结构化 | ❌ |
| SQLite.swift | 大型 | 关系型 | ✅ |
| Core Data | 超大型 | 对象图 | ✅ |
| Realm | 超大型 | 对象 | ✅ |
UserDefaults
@AppStorage("username") var username = ""
@AppStorage("theme") var theme = "light"
SQLite.swift
import SQLitelet db = try Connection("db.sqlite3")
let users = Table("users")
let id = Expression("id")
let name = Expression("name")
try db.run(users.insert(name <- "Alice"))
for user in try db.prepare(users) {
print(user[name])
}
网络与 API
URLSession 封装
enum APIError: Error {
case invalidURL, noData, decodingError, networkError(Error)
}func fetch(_ type: T.Type, from url: String) async throws -> T {
guard let url = URL(string: url) else { throw APIError.invalidURL }
let (data, _) = try await URLSession.shared.data(from: url)
do {
return try JSONDecoder().decode(T.self, from: data)
} catch {
throw APIError.decodingError
}
}
SwiftUI 网络图片
AsyncImage(url: URL(string: "https://...")) { phase in
switch phase {
case .empty: ProgressView()
case .success(let image): image.resizable()
case .failure: Image(systemName: "photo")
@unknown default: EmptyView()
}
}
App 分发与发布
构建配置
| 配置 | 用途 | 代码签名 | |------|------|---------| | Debug | 开发调试 | Development | | Release | App Store | Distribution | | Ad Hoc | 测试分发 | Distribution |
发布检查清单
常用权限声明
| 权限 | Info.plist Key |
|------|---------------|
| 相机 | NSCameraUsageDescription |
| 照片 | NSPhotoLibraryUsageDescription |
| 位置 | NSLocationWhenInUseUsageDescription |
| 通知 | 推送证书配置 |
SwiftUI 基础
页面结构
@main
struct MyApp: App {
var body: some Scene {
WindowGroup { ContentView() }
}
}struct ContentView: View {
@State private var count = 0
var body: some View {
VStack(spacing: 20) {
Text("Count: \(count)")
.font(.largeTitle)
Button("Increment") { count += 1 }
.buttonStyle(.borderedProminent)
}
}
}
组件层级
Window → ViewController → View → Subviews
NavigationController → ViewController → TableView → Cell
TabBarController → ViewController × N → NavigationController
状态管理
| 状态类型 | SwiftUI | UIKit | 生命周期 | |---------|---------|-------|---------| | 本地临时 | @State | local var | 视图存在期间 | | 页面级 | @State | view property | 页面存在期间 | | 应用级 | @AppStorage | UserDefaults | 跨页面持久化 | | 全局共享 | @StateObject | Singleton | 应用生命周期 |
SwiftUI 状态装饰器
// @State — 值类型,组件私有
@State private var text = "Hello"// @Binding — 双向绑定
@Binding var isPresented: Bool
// @StateObject — 引用类型,视图拥有
@StateObject private var viewModel = ViewModel()
// @ObservedObject — 引用类型,外部传入
@ObservedObject var viewModel: ViewModel
// @EnvironmentObject — 环境注入的全局状态
@EnvironmentObject var authService: AuthService
// @AppStorage — 持久化
@AppStorage("username") var username = ""
UIKit 状态
// 局部变量
class ViewController: UIViewController {
private var data: [String] = [] override func viewDidLoad() {
super.viewDidLoad()
data = loadData()
}
}
// 视图属性
class ViewController: UIViewController {
var initialData: [String] = []
}
// UserDefaults
UserDefaults.standard.string(forKey: "username")
// Singleton
let shared = NetworkManager.shared
Navigation 导航模式
SwiftUI NavigationStack(推荐)
NavigationStack {
List(users) { user in
NavigationLink(destination: UserDetailView(user: user)) {
Text(user.name)
}
}
}
UIKit 导航
// 导航控制器
let nav = UINavigationController(rootViewController: HomeVC())
nav.pushViewController(detailVC, animated: true)
nav.popViewController(animated: true)// TabBar 切换
UITabBarController()
├─ UINavigationController(首页)
├─ UINavigationController(发现)
└─ UINavigationController(我的)
网络层
SwiftUI + async/await
actor NetworkService {
static let shared = NetworkService() func fetch(_ type: T.Type, from url: URL) async throws -> T {
let (data, _) = try await URLSession.shared.data(from: url)
return try JSONDecoder().decode(T.self, from: data)
}
}
// 使用
Task {
let users = try await NetworkService.shared.fetch([User].self, from: url)
}
UIKit + async/await
class NetworkManager {
static let shared = NetworkManager() func request(_ type: T.Type, endpoint: String) async throws -> T {
guard let url = URL(string: endpoint) else {
throw NetworkError.invalidURL
}
let (data, _) = try await URLSession.shared.data(from: url)
return try JSONDecoder().decode(T.self, from: data)
}
}
URLSession 完整示例
import Foundationstruct User: Codable, Identifiable {
let id: String
let name: String
let email: String
}
enum NetworkError: Error {
case invalidURL
case requestFailed
case decodingFailed
case noData
}
class APIClient {
private let baseURL = "https://api.example.com"
private let session: URLSession
init() {
let config = URLSessionConfiguration.default
config.timeoutIntervalForRequest = 30
self.session = URLSession(configuration: config)
}
func get(_ type: T.Type, path: String) async throws -> T {
guard let url = URL(string: baseURL + path) else {
throw NetworkError.invalidURL
}
var request = URLRequest(url: url)
request.httpMethod = "GET"
request.setValue("application/json", forHTTPHeaderField: "Content-Type")
let (data, response) = try await session.data(for: request)
guard let httpResponse = response as? HTTPURLResponse,
(200...299).contains(httpResponse.statusCode) else {
throw NetworkError.requestFailed
}
let decoder = JSONDecoder()
decoder.keyDecodingStrategy = .convertFromSnakeCase
do {
return try decoder.decode(T.self, from: data)
} catch {
throw NetworkError.decodingFailed
}
}
func post(_ type: T.Type, path: String, body: B) async throws -> T {
guard let url = URL(string: baseURL + path) else {
throw NetworkError.invalidURL
}
var request = URLRequest(url: url)
request.httpMethod = "POST"
request.setValue("application/json", forHTTPHeaderField: "Content-Type")
let encoder = JSONEncoder()
encoder.keyEncodingStrategy = .convertToSnakeCase
request.httpBody = try encoder.encode(body)
let (data, response) = try await session.data(for: request)
guard let httpResponse = response as? HTTPURLResponse,
(200...299).contains(httpResponse.statusCode) else {
throw NetworkError.requestFailed
}
return try JSONDecoder().decode(T.self, from: data)
}
}
依赖注入
SwiftUI Environment 注入
struct ContentView: View {
@EnvironmentObject var authService: AuthService
var body: some View { ... }
}// App 层级注入
ContentView()
.environmentObject(AuthService())
UIKit Protocol 注入
protocol NetworkServiceProtocol {
func fetchUsers() async throws -> [User]
}class ViewModel {
let networkService: NetworkServiceProtocol
init(networkService: NetworkServiceProtocol = NetworkService.shared) {
self.networkService = networkService
}
}
Combine 响应式编程
Publisher 与 Subscriber
import Combine// Publisher
let publisher = PassthroughSubject()
// Subscriber
let cancellable = publisher
.filter { $0.count > 3 }
.map { $0.uppercased() }
.sink { print($0) }
// Future + Promise
func fetchUser(id: Int) -> Future {
Future { promise in
// 异步操作
promise(.success(user))
}
}
SwiftUI + Combine
@Published var searchText: String = ""var searchResults: AnyPublisher<[User], Never> {
$searchText
.debounce(for: .milliseconds(300), scheduler: RunLoop.main)
.removeDuplicates()
.flatMap { query in
query.isEmpty ? Just([]).eraseToAnyPublisher()
: api.search(query: query)
}
.receive(on: DispatchQueue.main)
.eraseToAnyPublisher()
}
AnyCancellable 内存管理
swift
import Combineclass ViewModel {
private var cancellables = Set
func bind() { $searchText .debounce(for: .milliseconds(300), scheduler: RunLoop.main) .sink { [weak self] text in self?.performSearch(text) } .store(in: &cancellables) } }
// Store in property class AnotherViewModel { @Published var data: [Item] = []
private var cancellables = Set
func subscribe(to api: APIService) { api.itemsPublisher .receive(on: DispatchQueue.main) .sink { [weak self] items in self?.data = items } .store(in: &cancellables) } }
// 取消订阅 cancellables.removeAll() // 手动取消所有
常用 Operators
| Operator | 用途 |
|----------|------|
| map | 转换值 |
| filter | 过滤值 |
| flatMap | 展平嵌套 Publisher |
| debounce | 防抖(搜索场景) |
| throttle | 节流(滚动场景) |
| removeDuplicates | 去重 |
| combineLatest | 合并多个 Publisher |
| merge | 合并同类型 Publisher |
| catch | 错误处理 |
| retry | 重试 |
| zip | 配对组合 |
性能优化
| 场景 | SwiftUI | UIKit |
|------|---------|-------|
| 列表滚动 | LazyVStack | UITableView/UICollectionView |
| 图片缓存 | AsyncImage + 第三方库 | SDWebImage/Kingfisher |
| 预取数据 | .task modifier | UITableViewDataSourcePrefetching |
| 后台任务 | Task.detached | async/await |
SwiftUI 列表优化
swift
// ✅ 推荐:LazyVStack
List {
ForEach(items) { item in
ItemView(item: item)
}
}// ❌ 避免:大列表不用 Lazy VStack { ForEach(items) { item in // 全部渲染 ItemView(item: item) } }
UIKit 列表优化
swift
// UICollectionView 预加载
func collectionView(_ collectionView: UICollectionView, prefetchItemsAt indexPaths: [IndexPath]) {
for indexPath in indexPaths {
let item = items[indexPath.item]
imageLoader.prefetch(url: item.imageURL)
}
}
测试策略
单元测试 → ViewModel / Service 逻辑
↓
UI 测试 → View 渲染 + 交互(XCUITest)
↓
集成测试 → 模块间交互
↓
快照测试 → UI 视觉回归(swift-snapshot-testing)
Swift 单元测试示例
swift
import XCTestfinal class UserViewModelTests: XCTestCase { var viewModel: UserListViewModel! var mockService: MockNetworkService!
override func setUp() { super.setUp() mockService = MockNetworkService() viewModel = UserListViewModel(networkService: mockService) }
func testLoadUsersSuccess() async { // Given mockService.users = [User(id: "1", name: "John")]
// When await viewModel.loadUsers()
// Then XCTAssertEqual(viewModel.users.count, 1) XCTAssertFalse(viewModel.isLoading) } }
完整页面示例
SwiftUI + MVVM
swift
// Model
struct User: Identifiable, Codable {
let id: String
let name: String
let email: String
}// ViewModel @MainActor class UserListViewModel: ObservableObject { @Published var users: [User] = [] @Published var isLoading = false @Published var error: String?
func loadUsers() async { isLoading = true defer { isLoading = false } do { users = try await api.fetch(User.self, path: "/users") } catch { self.error = error.localizedDescription } } }
// View struct UserListView: View { @StateObject private var vm = UserListViewModel()
var body: some View { NavigationStack { Group { if vm.isLoading { ProgressView() } else if let error = vm.error { Text("Error: \(error)") .foregroundColor(.red) } else { List(vm.users) { user in NavigationLink(destination: UserDetailView(user: user)) { HStack { Text(user.name) Spacer() Text(user.email) .foregroundColor(.secondary) } } } } } .navigationTitle("用户") .task { await vm.loadUsers() } } } }
UIKit + MVC
swift
import UIKit
import SnapKitclass UserListViewController: UIViewController { private let tableView = UITableView(frame: .zero, style: .insetGrouped) private var users: [User] = []
override func viewDidLoad() { super.viewDidLoad() setupUI() loadData() }
private func setupUI() { title = "用户" view.backgroundColor = .systemGroupedBackground
tableView.delegate = self tableView.dataSource = self tableView.register(UITableViewCell.self, forCellReuseIdentifier: "Cell") view.addSubview(tableView)
tableView.snp.makeConstraints { make in make.edges.equalToSuperview() } }
private func loadData() { Task { do { users = try await APIClient.shared.get([User].self, path: "/users") tableView.reloadData() } catch { showError(error) } } } }
extension UserListViewController: UITableViewDataSource, UITableViewDelegate { func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { return users.count }
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) let user = users[indexPath.row] var config = cell.defaultContentConfiguration() config.text = user.name config.secondaryText = user.email cell.contentConfiguration = config return cell }
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) { tableView.deselectRow(at: indexPath, animated: true) let user = users[indexPath.row] let detailVC = UserDetailViewController(user: user) navigationController?.pushViewController(detailVC, animated: true) } }
Swift 语言权威参考
> 来源:The Swift Programming Language (6.3)
> https://docs.swift.org/swift-book/documentation/the-swift-programming-language/
> CC BY 4.0 License
类型系统
基本类型
| 类型 | 说明 | 示例 |
|------|------|------|
| Int | 整数 | 42, -7 |
| Double | 64位浮点 | 3.14159 |
| Float | 32位浮点 | 3.14 |
| Bool | 布尔 | true / false |
| String | 字符串 | "Hello" |
| Character | 单字符 | "A" |
类型推断与注解
swift
let inferred = 42 // Int
let annotated: Int = 42 // 显式 Int
let pi: Double = 3.14 // Double
类型别名
swift
typealias AudioSample = UInt16
typealias Callback = (Int, String) -> Void
Optional 可选类型
定义与解包
swift
// 定义
var serverResponse: String? = nil
var response: String! = nil // 隐式解包// 解包方式 if let value = optional { print(value) }
// guard 解包 func process(_ value: String?) { guard let value = value else { return } print(value) }
// ?? 操作符 let name = optional ?? "default"
// 链式调用 let upper = optional?.uppercased()
Optional 模式
swift
// switch 模式匹配
switch optional {
case .some(let value):
print(value)
case .none:
print("nil")
}// 问号链式调用 person?.address?.city
Tuple 元组
swift
// 定义
let httpError = (404, "Not Found")
let (code, message) = httpError
let onlyCode = httpError.0// 命名 let success = (code: 200, message: "OK") success.code success.message
// 返回多值 func getUser() -> (name: String, age: Int) { return ("Alice", 30) }
集合类型
Array
swift
// 创建
var arr = [Int]() // 空
var arr2 = Array(repeating: 0, count: 5) // [0,0,0,0,0]
let literals = [1, 2, 3] // 字面量// 操作 arr.append(4) arr.insert(0, at: 0) arr.remove(at: 0) arr.removeLast() arr.first arr.last
// 遍历 for item in arr { } for (i, v) in arr.enumerated() { }
Set
swift
// 创建
var set = Set// 操作 set.insert("Pop") set.remove("Rock") set.contains("Jazz")
// 集合运算 a.union(b) // 并集 a.intersection(b) // 交集 a.subtracting(b) // 差集 a.symmetricDifference(b) // 对称差集
// 关系 a.isSubset(of: b) a.isSuperset(of: b) a.isDisjoint(with: b)
Dictionary
swift
// 创建
var dict = [String: Int]()
let capitals = ["CN": "Beijing", "JP": "Tokyo"]// 操作 dict["key"] = "value" dict["key"] = nil // 删除 dict.updateValue("v", forKey: "k") // 返回旧值
// 安全访问 if let value = dict["key"] { }
// 遍历 for (k, v) in dict { } for key in dict.keys { } for value in dict.values { }
函数
定义与调用
swift
func greet(name: String) -> String {
return "Hello, \(name)"
}
greet(name: "World")// 参数标签 func greet(to name: String) -> String { return "Hello, \(name)" } greet(to: "World")
// 默认参数 func greet(_ name: String = "World") -> String { return "Hello, \(name)" }
// 可变参数 func sum(_ numbers: Int...) -> Int { return numbers.reduce(0, +) } sum(1, 2, 3, 4, 5)
// inout 参数 func swap(_ a: inout Int, _ b: inout Int) { let temp = a a = b b = temp }
函数类型
swift
var mathFunc: (Int, Int) -> Int = { $0 + $1 }// 作为参数 func apply(_ op: (Int, Int) -> Int, _ a: Int, _ b: Int) -> Int { return op(a, b) } apply(mathFunc, 3, 4)
// 作为返回值 func choose(_ op: Bool) -> (Int, Int) -> Int { return op ? { $0 + $1 } : { $0 - $1 } }
嵌套函数
swift
func outer() -> () -> Int {
var count = 0
func inner() -> Int {
count += 1
return count
}
return inner
}
闭包
基本语法
swift
// 完整语法
{ (params) -> ReturnType in
statements
}// 类型推断 { a, b in a + b }
// 无参数 { () -> Int in 42 }
// 返回类型推断 { $0 + $1 }
尾随闭包
swift
// 不用尾随
arr.map({ (x: Int) -> Int in x * 2 })// 尾随闭包 arr.map { $0 * 2 }
// 最后一个参数是闭包 arr.map { x in x * 2 }
@escaping
swift
var handlers: [() -> Void] = []func withEscaping(_ handler: @escaping () -> Void) { handlers.append(handler) }
func withoutEscaping(_ handler: () -> Void) { handler() }
// 逃逸闭包需要显式 self class MyClass { var x = 10 func test() { withEscaping { self.x = 20 } // 必须显式 withoutEscaping { x = 30 } // 可省略 } }
捕获
swift
func makeCounter() -> () -> Int {
var count = 0
return {
count += 1
return count
}
}
let counter = makeCounter()
counter() // 1
counter() // 2
枚举
swift
enum Direction {
case north, south, east, west
}let dir: Direction = .north
// 关联值 enum Result { case success(Data) case failure(Error) }
// 方法 enum Device { case phone, tablet func description() -> String { switch self { case .phone: return "iPhone" case .tablet: return "iPad" } } }
// 原始值 enum ASCIIControl: Character { case tab = "\t" case newline = "\n" }
结构体与类
对比
| 特性 | struct | class |
|------|--------|-------|
| 类型 | 值类型 | 引用类型 |
| 继承 | ❌ | ✅ |
| 初始化 | 自动生成 | 手动 |
| 析构 | — | ✅ |
| 引用计数 | — | ✅ |
swift
struct Point {
var x: Double
var y: Double
// 自动生成 memberwise init
}class Person { var name: String var age: Int init(name: String, age: Int) { self.name = name self.age = age } }
属性
存储属性
swift
struct FixedRange {
var start: Int
let end: Int // 常量
}
计算属性
swift
struct Rect {
var origin: Point
var size: Size
var center: Point {
get {
Point(x: origin.x + size.width/2,
y: origin.y + size.height/2)
}
set {
origin.x = newValue.x - size.width/2
origin.y = newValue.y - size.height/2
}
}
}
属性包装器
swift
@propertyWrapper
struct SmallNumber {
private var number: Int
var value: Int {
get { min(number, 12) }
set { number = newValue }
}
init() { number = 0 }
init(wrappedValue: Int) { number = min(wrappedValue, 12) }
}@SmallNumber var value: Int // 使用
属性观察者
swift
class StepCounter {
var totalSteps: Int = 0 {
willSet { print("will set to \(newValue)") }
didSet { print("did set from \(oldValue)") }
}
}
懒加载
swift
class DataManager {
lazy var importer = DataImporter() // 首次访问时才创建
}
方法
实例方法
swift
class Counter {
var count = 0
func increment() { count += 1 }
func increment(by amount: Int) { count += amount }
func reset() { count = 0 }
}
静态/类方法
swift
struct MathUtils {
static func sqrt(_ n: Double) -> Double { ... }
}
MathUtils.sqrt(16)// 类方法(可被重写) class Animal { class func info() { print("Animal") } }
下标
swift
struct TimesTable {
subscript(index: Int) -> Int {
return index * multiplier
}
}
let table = TimesTable(multiplier: 3)
table[6] // 18// 多维下标 struct Matrix { subscript(row: Int, col: Int) -> Double { get { return grid[row * 3 + col] } set { grid[row * 3 + col] = newValue } } }
继承
swift
class Vehicle {
var speed = 0
func describe() -> String { "speed: \(speed)" }
}class Bicycle: Vehicle { var hasBasket = false override func describe() -> String { // 调用父类 return super.describe() + ", basket: \(hasBasket)" } }
// final 类不可被继承 final class FinalClass { }
初始化与析构
初始化
swift
class ShoppingListItem {
var name: String
var quantity: Int = 1
var completed: Bool = falseinit(name: String, quantity: Int = 1) { self.name = name self.quantity = quantity } }
// 可失败初始化 struct Animal { let species: String init?(species: String) { if species.isEmpty { return nil } self.species = species } }
析构
swift
class FileHandler {
var file: FileHandle
init() { file = open(...) }
deinit {
file.close()
}
}
错误处理
错误处理
swift
// 定义错误
enum NetworkError: Error {
case badURL
case noData
case decodingFailed
}// 抛出 func fetch() throws -> Data { guard let url = URL(string: "...") else { throw NetworkError.badURL } return try Data(contentsOf: url) }
// 处理 do { let data = try fetch() } catch NetworkError.badURL { print("Bad URL") } catch { print("Error: \(error)") }
// try? 转换 Optional let data = try? fetch()
// try! 强制解包(危险) let data = try! fetch()
协议与泛型
协议
定义与遵循
swift
protocol ExampleProtocol {
var simpleDescription: String { get }
mutating func adjust()
}// 遵循 struct SimpleStructure: ExampleProtocol { var simpleDescription: String = "A simple structure" mutating func adjust() { } }
// 类遵循 class SimpleClass: ExampleProtocol { var simpleDescription: String = "A simple class" func adjust() { } }
协议扩展
swift
extension Collection {
func allEven() -> [Element] where Element: Numeric {
return self.filter { ($0 as? Int ?? 0) % 2 == 0 }
}
}
泛型
函数泛型
swift
func swapTwoValues
类型约束
swift
func findIndex
泛型类型
swift
struct Stack
where 子句
swift
func allItemsMatch
访问控制
| 修饰符 | 范围 |
|--------|------|
| open | 任意模块,可被继承 |
| public | 任意模块 |
| internal | 模块内(默认) |
| fileprivate | 当前文件 |
| private | 当前作用域 |
swift
public class PublicClass {
private var privateVar = 0
fileprivate var fileVar = 0
}
扩展
swift
extension Int {
var isEven: Bool { return self % 2 == 0 }
func repetitions(_ task: () -> Void) {
for _ in 0..5.isEven // true 3.repetitions { print("Hello") }
类型转换
swift
// 类型检查
if item is String {
print("String")
}// 向下转型 if let str = item as? String { print(str) }
// 强制转型(危险) let str = item as! String
// Any 和 AnyObject var things: [Any] = [] things.append(42) things.append("string")
嵌套类型
swift
struct ChessBoard {
enum Piece {
case king, queen, rook, bishop, knight, pawn
}
var board: [[Piece?]]
}let piece: ChessBoard.Piece = .king
Swift 6 并发
Swift 6 Concurrency
async/await
swift
func fetchData() async throws -> Data { ... }Task { do { let data = try await fetchData() } catch { print(error) } }
// async let 并行 async let first = fetchData() async let second = anotherFetch() let results = await [first, second]
Task
swift
// 创建
let task = Task { await doWork() }
let result = await task.value
task.cancel()// TaskGroup await withTaskGroup(of: Data.self) { group in for url in urls { group.addTask { await fetch(url) } } var results: [Data] = [] for await data in group { results.append(data) } }
Actor
swift
actor SafeCounter {
private var count = 0
func increment() { count += 1 }
func getCount() -> Int { count }
}// MainActor @MainActor func updateUI() { // UI 更新 }
Sendable
swift
struct User: Sendable { let id: String }actor SafeLogger: Sendable { // actor 自动 Sendable }
---避坑指南
常见错误
| 错误做法 | 正确做法 |
|---------|---------|
| ❌ 在主线程执行网络请求 | ✅ async/await 自动后台执行 |
| ❌ 不处理网络错误 | ✅ always try-catch + user feedback |
| ❌ @State 用于引用类型 | ✅ @StateObject 用于 class |
| ❌ 不用 LazyVStack 处理大列表 | ✅ 懒加载避免性能问题 |
| ❌ 硬编码 URL | ✅ Configuration/Environment |
SwiftUI 陷阱
⚠️ @State 复制语义 — @State 修饰的 struct 是值语义,修改会触发重渲染
⚠️ @StateObject 只初始化一次 — 不能在 body 中创建
⚠️ onAppear vs task — task 可取消,onAppear 不行 UIKit 陷阱
⚠️ 循环引用 — delegate/closure 记得用 [weak self]
⚠️ 主线程 UI — UI 更新必须在主线程
⚠️ Memory Leak — 及时清理 NotificationCenter 观察者
来源
> 来源:Apple Developer Documentation(2026-04-23 访问)
> - SwiftUI: https://developer.apple.com/documentation/swiftui
> - UIKit: https://developer.apple.com/documentation/uikit
> - Xcode: https://developer.apple.com/documentation/xcode
> - Combine: https://developer.apple.com/documentation/combine
>
> 更新频率:随 Xcode/iOS 版本迭代
持久化
UserDefaults
适用于:小量配置、用户偏好、简单状态
swift
// SwiftUI
@AppStorage("username") var username = ""
@AppStorage("isDarkMode") var isDarkMode = false// 代码直接访问 UserDefaults.standard.string(forKey: "username") UserDefaults.standard.set("value", forKey: "key")
SQLite(生产推荐)
适用于:结构化数据、离线存储、查询性能
swift
import SQLiteclass DatabaseManager { static let shared = DatabaseManager() private var db: Connection?
// 表定义
private let users = Table("users")
private let id = SQLite.Expression
init() { do { let path = NSSearchPathForDirectoriesInDomains( .documentDirectory, .userDomainMask, true ).first! db = try Connection("\(path)/sqlite.db") try createTables() } catch { print("Database error: \(error)") } }
private func createTables() throws { try db?.run(users.create(ifNotExists: true) { t in t.column(id, primaryKey: .autoincrement) t.column(name) t.column(email) }) }
// CRUD func insertUser(_ user: User) throws { let insert = users.insert( name <- user.name, email <- user.email ) try db?.run(insert) }
func fetchUsers() throws -> [User] { guard let db = db else { return [] } return try db.prepare(users).map { row in User( id: row[id], name: row[name], email: row[email] ) } }
func deleteUser(_ userId: Int64) throws { let user = users.filter(id == userId) try db?.run(user.delete()) } }
Core Data(苹果官方)
适用于:复杂对象图、大量关系数据、Apple 生态深度集成
swift
// Core Data Stack
class CoreDataManager {
static let shared = CoreDataManager()lazy var persistentContainer: NSPersistentContainer = { let container = NSPersistentContainer(name: "Model") container.loadPersistentStores { _, error in if let error = error { fatalError("Core Data failed: \(error)") } } container.viewContext.automaticallyMergesChangesFromParent = true return container }()
var viewContext: NSManagedObjectContext { persistentContainer.viewContext }
func save() { let context = viewContext if context.hasChanges { do { try context.save() } catch { print("Save error: \(error)") } } } }
// SwiftUI 集成 struct ContentView: View { @Environment(\.managedObjectContext) var viewContext
@FetchRequest(
sortDescriptors: [NSSortDescriptor(keyPath: \User.name, ascending: true)],
animation: .default
)
var users: FetchedResults
var body: some View { List(users, id: \.self) { user in Text(user.name ?? "Unknown") } } }
Swift Concurrency 深度
Sendable 协议
确保数据可以安全跨并发域传递。
swift
// ✅ 可Sendable的类型
struct User: Sendable {
let id: String
let name: String
// 值类型默认 Sendable
}// ⚠️ Class 需要手动实现 final class SafeClass: @unchecked Sendable { // 不做线程安全假设,仅用于已知安全的场景 }
// ❌ 不可Sendable class UnsafeClass { var cache = [String: Any]() // 包含可变状态 }
MainActor
确保代码在主线程执行,用于 UI 更新。
swift
// 方法级别
@MainActor
func updateUI() {
// 自动在主线程执行
self.username = "New Name"
}// 类级别(所有方法默认主线程) @MainActor class ViewModel: ObservableObject { @Published var items: [Item] = []
// 隐式 @MainActor func loadItems() async { let fetched = await network.fetchItems() self.items = fetched // 安全 } }
// 非隔离函数访问主线程数据 nonisolated func describe(_ vm: ViewModel) { // ❌ 不能访问 @Published // ✅ 可以访问 Sendable 属性 print("Description") }
TaskGroup
并发执行多个任务。
swift
// 并发下载
func fetchAllImages(urls: [URL]) async throws -> [Data] {
try await withThrowingTaskGroup(of: Data.self) { group in
for url in urls {
group.addTask {
let (data, _) = try await URLSession.shared.data(from: url)
return data
}
}var results: [Data] = [] for try await data in group { results.append(data) } return results } }
// 带取消 func fetchWithCancel(urls: [URL]) async { await withTaskGroup(of: Data?.self) { group in for url in urls { group.addTask { try? await Task.sleep(nanoseconds: 1_000_000_000) guard !Task.isCancelled else { return nil } let (data, _) = try await URLSession.shared.data(from: url) return data } } } }
Task 取消
swift
// 检查取消
func performWork() async throws {
for item in items {
try Task.checkCancellation() // 抛出 CancellationError
// 处理 item
}
}// withTaskCancellationHandler try await withTaskCancellationHandler { try await longRunningWork() } onCancel: { cleanup() }
// 传递取消 struct DetailView: View { @State private var data: Data? @Environment(\.dismiss) var dismiss
var body: some View { Button("加载") { Task { data = await fetchData() } } .onDisappear { // 视图消失时自动取消 } } }
UIKit 进阶
UICollectionView
生产级列表/网格首选。
swift
class CollectionViewController: UIViewController {
private var collectionView: UICollectionView!
private var dataSource: UICollectionViewDiffableDataSourceenum Section: Hashable { case main case featured }
override func viewDidLoad() { super.viewDidLoad() setupCollectionView() configureDataSource() applySnapshot() }
private func setupCollectionView() { // Compositional Layout let config = UICollectionLayoutConfiguration( -interSectionSpacing: 16 ) let layout = UICollectionViewCompositionalLayout( sectionProvider: { sectionIndex, environment in let itemSize = NSCollectionLayoutSize( widthDimension: .fractionalWidth(0.5), heightDimension: .fractionalHeight(1.0) ) let item = NSCollectionLayoutItem(layoutSize: itemSize) item.contentInsets = NSDirectionalEdgeInsets( top: 8, leading: 8, bottom: 8, trailing: 8 )
let groupSize = NSCollectionLayoutSize( widthDimension: .fractionalWidth(1.0), heightDimension: .absolute(180) ) let group = NSCollectionLayoutGroup.horizontal( layoutSize: groupSize, subitems: [item] )
let section = NSCollectionLayoutSection(group: group) section.contentInsets = NSDirectionalEdgeInsets( top: 0, leading: 16, bottom: 16, trailing: 16 )
return NSCollectionLayoutSection(section: section) }, configuration: config )
collectionView = UICollectionView( frame: view.bounds, collectionViewLayout: layout ) collectionView.autoresizingMask = [.flexibleWidth, .flexibleHeight] collectionView.delegate = self view.addSubview(collectionView) }
private func configureDataSource() { let cellRegistration = UICollectionView.CellRegistration< UICollectionViewCell, Item > { cell, indexPath, item in var config = UIListContentConfiguration.cell() config.text = item.title config.secondaryText = item.subtitle config.image = UIImage(systemName: item.icon) cell.contentConfiguration = config }
dataSource = UICollectionViewDiffableDataSource
private func applySnapshot() {
var snapshot = NSDiffableDataSourceSnapshot
extension CollectionViewController: UICollectionViewDelegate { func collectionView( _ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath ) { guard let item = dataSource.itemIdentifier(for: indexPath) else { return } // 处理选择 } }
Auto Layout 完整约束
swift
// NSLayoutConstraint 语法
label.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
label.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 16),
label.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -16),
label.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 16),
label.heightAnchor.constraint(greaterThanOrEqualToConstant: 44)
])// 优先级 let highPriority = label.widthAnchor.constraint(equalToConstant: 100) highPriority.priority = .defaultHigh // 750
let lowPriority = label.widthAnchor.constraint(equalToConstant: 50) lowPriority.priority = .defaultLow // 250
// 比例约束 label.widthAnchor.constraint(equalTo: view.widthAnchor, multiplier: 0.5)
// 尺寸约束 label.heightAnchor.constraint(equalTo: label.widthAnchor, multiplier: 1.5)
键盘处理
swift
class KeyboardViewController: UIViewController {
@IBOutlet weak var scrollView: UIScrollView!
@IBOutlet weak var textField: UITextField!override func viewDidLoad() { super.viewDidLoad() setupKeyboardObservers() }
private func setupKeyboardObservers() { NotificationCenter.default.addObserver( self, selector: #selector(keyboardWillShow), name: UIResponder.keyboardWillShowNotification, object: nil ) NotificationCenter.default.addObserver( self, selector: #selector(keyboardWillHide), name: UIResponder.keyboardWillHideNotification, object: nil ) }
@objc func keyboardWillShow(_ notification: Notification) { guard let keyboardFrame = notification.userInfo?[ UIResponder.keyboardFrameEndUserInfoKey ] as? CGRect else { return }
let contentInsets = UIEdgeInsets( top: 0, left: 0, bottom: keyboardFrame.height, right: 0 ) scrollView.contentInset = contentInsets scrollView.scrollIndicatorInsets = contentInsets }
@objc func keyboardWillHide(_ notification: Notification) { scrollView.contentInset = .zero scrollView.scrollIndicatorInsets = .zero }
@objc func dismissKeyboard() { view.endEditing(true) } }
// SwiftUI 版本 struct KeyboardAvoidingView: View { @State private var text = "" @FocusState private var isFocused: Bool
var body: some View { ScrollView { TextField("输入", text: $text) .focused($isFocused) .padding() .background(Color.gray.opacity(0.2)) } .onTapGesture { isFocused = false } } }
Swift Concurrency 避坑
常见错误
| 错误做法 | 正确做法 |
|---------|---------|
| ❌ nonisolated 函数访问 @Published | ✅ 用 @MainActor 包装 |
| ❌ 跨线程传递 UIView | ✅ 始终在主线程操作 |
| ❌ Task 不保存引用 | ✅ 存储 Task 以支持取消 |
| ❌ 忘记 CancellationError | ✅ 调用 Task.checkCancellation() |
| ❌ actor 内部用锁 | ✅ actor 天然线程安全 |
| ❌ 传递非 Sendable 闭包 | ✅ 确保闭包捕获值是 Sendable |
@MainActor 传递规则
swift
@MainActor
class ViewModel {
func update() { /* 主线程 */ }
}// ✅ 正确:await 后自动回到主线程 let vm = ViewModel() Task { @MainActor in await someAsyncMethod() vm.update() // 安全 }
// ❌ 错误:非隔离上下文访问 Task { await someAsyncMethod() // vm.update() // ❌ 编译错误 }
Widget 开发
widget.md — TimelineProvider / App Group / Interactive Widget / Lock Screen Widget 国际化与本地化
localization.md — NSLocalizedString / String Catalog / 格式化 / RTL / App Store 本地化 Swift Concurrency 权威参考
swift-concurrency.md — async/await / TaskGroup / MainActor / Actor / Sendable / Swift 6 快速参考
SwiftUI 状态装饰器速查
| 装饰器 | 作用域 | 父传子 | 创建者 |
|--------|--------|--------|--------|
| @State | 局部 | ❌ | 视图 |
| @Binding | 局部 | ✅ | 视图 |
| @StateObject | 局部 | ❌ | 视图 |
| @ObservedObject | 局部 | ✅ | 父视图 |
| @EnvironmentObject | 全局 | ✅ | 任意 |
| @AppStorage | 全局 | ✅ | UserDefaults |
| @SceneStorage | 全局 | ✅ | Scene |
| @FocusState | 局部 | ✅ | 视图 |
| @ScaledMetric | 局部 | ✅ | 视图 |
UIKit vs SwiftUI 生命周期
| 阶段 | UIKit | SwiftUI |
|------|-------|---------|
| 创建 | init | @State init |
| 加载视图 | loadView | body |
| 视图加载 | viewDidLoad | .task |
| 即将显示 | viewWillAppear | .onAppear |
| 已显示 | viewDidAppear | — |
| 即将消失 | viewWillDisappear | .onDisappear |
| 已消失 | viewDidDisappear | — |
| 内存警告 | didReceiveMemoryWarning | .onChange |
iOS 版本支持速查
| API | 最低版本 |
|-----|---------|
| NavigationStack | iOS 16+ |
| @MainActor | iOS 16+ / Swift 5.5+ |
| SwiftUI Charts | iOS 16+ |
| AnyCancellable store | iOS 13+ |
| AsyncSequence | Swift 5.5+ |
| WidgetKit | iOS 14+ |
| Live Activities | iOS 16.1+ |
| Interactive Widget | iOS 17+ |
Auto Layout 速查
swift
// 核心约束
label.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
label.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 16),
label.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -16),
label.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor),
label.heightAnchor.constraint(greaterThanOrEqualToConstant: 44)
])// SnapKit view.snp.makeConstraints { make in make.edges.equalToSuperview().inset(16) make.height.greaterThanOrEqualTo(100) make.width.equalToSuperview().multipliedBy(0.5) }
// 优先级 .widthAnchor.constraint(equalToConstant: 100).priority = .defaultHigh // 750 .widthAnchor.constraint(equalToConstant: 50).priority = .defaultLow // 250 .widthAnchor.constraint(equalToConstant: 0).priority = .required // 1000
网络状态速查
| 状态 | SwiftUI | UIKit |
|------|---------|-------|
| 空闲 | isLoading = false | state = .idle |
| 加载中 | isLoading = true | state = .loading |
| 成功 | @Published var items | delegate?.didFinish |
| 错误 | @Published var error | delegate?.didFail |
Combine 操作符速查
| 操作符 | 用途 | 示例 |
|--------|------|------|
| map | 转换值 | .map { $0 * 2 } |
| filter | 过滤 | .filter { $0 > 0 } |
| flatMap | 展平 | .flatMap { $0.publisher } |
| debounce | 防抖 | .debounce(for: .milliseconds(300), scheduler: RunLoop.main) |
| throttle | 节流 | .throttle(for: .seconds(1), scheduler: RunLoop.main, latest: true) |
| combineLatest | 合并 | Publishers.CombineLatest(a, b) |
| merge | 合并同类型 | a.merge(with: b) |
| catch | 错误处理 | .catch { Just(default) } |
| retry | 重试 | .retry(3) |
| zip | 配对 | a.zip(b) |
Auto Layout 速查
swift
// 核心约束
label.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 16)
label.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -16)
label.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor)
label.heightAnchor.constraint(greaterThanOrEqualToConstant: 44)// SnapKit view.snp.makeConstraints { make in make.edges.equalToSuperview().inset(16) make.height.greaterThanOrEqualTo(100) }
// 优先级 .widthAnchor.constraint(equalToConstant: 100).priority = .defaultHigh .widthAnchor.constraint(equalToConstant: 50).priority = .defaultLow
Widget 尺寸速查
| 尺寸 | 宽度 | 高度 | 用途 |
|------|------|------|------|
| systemSmall | 155pt | 155pt | 单指标 |
| systemMedium | 329pt | 155pt | 双指标 |
| systemLarge | 329pt | 345pt | 列表卡片 |
| accessoryCircular | — | — | 锁屏圆形 |
| accessoryRectangular | — | — | 锁屏矩形 |
常用尺寸速查
| 场景 | 尺寸 |
|------|------|
| 最小点击区域 | 44pt |
| 标准间距 | 16pt |
| 大间距 | 24pt |
| 安全区留边 | 16pt |
| TabBar 高度 | 49pt |
| NavigationBar 高度 | 44pt |
| Widget 圆角 | 20pt |
| 按钮圆角 | 8pt |
| 图片圆角 | 12pt |
Swift Concurrency 速查
swift
// async/await
func fetch() async throws -> Data// Task Task { await fetch() } Task.detached { await fetch() }
// TaskGroup await withTaskGroup(of: Data.self) { group in group.addTask { await fetch() } }
// MainActor @MainActor func update() { } Task { @MainActor in update() }
// Sendable struct User: Sendable { let id: String } actor SafeCounter { }
// 取消
Task.checkCancellation()
Task.isCancelled
task.cancel()
``
生命周期速查
| 事件 | SwiftUI | UIKit |
|------|---------|-------|
| 视图出现 | .onAppear | viewDidAppear |
| 视图消失 | .onDisappear | viewDidDisappear |
| 应用激活 | .onReceive | applicationDidBecomeActive |
| 应用休眠 | — | applicationWillResignActive |
输出格式规范
当使用本技能回答用户问题时,遵循以下格式:
回复结构
1. 直接回答 — 一段简洁的话给出核心答案 2. 代码示例 — 提供完整的 SwiftUI/UIKit 代码(如需) 3. 实现要点 — 关键步骤和注意事项 4. 避坑提醒 — 常见错误+正确做法示例回复(网络请求)
> SwiftUI 推荐使用 async/await 处理网络请求。定义一个 NetworkService actor 封装 URLSession,在 ViewModel 中用 @Published 管理状态。示例:定义 fetch 泛型方法,用 Task 调用并更新 @Published 属性。错误处理用 do-catch`,始终给用户反馈。