AppDelegate解耦
摘要：
作為iOS整個專案的核心App delegate
,隨著專案的逐漸變大,會變得越來越臃腫,一不小心程式碼就過了千行.
大型專案的App delegate
體積會大到什麼程度呢?我們可以參考下國外2億多月活的Telegram
的App delegate...
作為iOS整個專案的核心App delegate
,隨著專案的逐漸變大,會變得越來越臃腫,一不小心程式碼就過了千行.
大型專案的App delegate
體積會大到什麼程度呢?我們可以參考下國外2億多月活的Telegram
的ofollow,noindex">App delegate
.是不是嚇一跳,4千多行.看到這樣的程式碼是不是很想點選左上角的x.
是時候該給App delegate
解耦了,目標:
每個功能的配置或者初始化都分開,各自做各自的事情.App delegate
要做到只需要呼叫就好了.
下面來談談如何利用兩種設計模式實現:
1.命令模式
命令模式: 傳送方傳送請求,然後接收方接受請求後執行,但傳送方可能並不知道接受方是誰，執行的是什麼操作,這樣做的好處是傳送方和接受方完全的鬆耦合，大大提高程式的靈活性.
1. 定義好協議,把相關初始化配置程式碼分類
protocol Command {
func execute()
}
struct InitializeThirdPartiesCommand: Command {
func execute() {
// 第三方庫初始化程式碼
}
}
struct InitialViewControllerCommand: Command {
let keyWindow: UIWindow
func execute() {
// 根控制器設定程式碼
}
}
struct InitializeAppearanceCommand: Command {
func execute() {
// 全域性外觀樣式配置
}
}
struct RegisterToRemoteNotificationsCommand: Command {
func execute() {
// 遠端推送配置
}
}
複製程式碼
2. 管理者
final class StartupCommandsBuilder {
private var window: UIWindow!
func setKeyWindow(_ window: UIWindow) -> StartupCommandsBuilder {
self.window = window
return self
}
func build() -> [Command] {
return [
InitializeThirdPartiesCommand(),
InitialViewControllerCommand(keyWindow: window),
InitializeAppearanceCommand(),
RegisterToRemoteNotificationsCommand()
]
}
}
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3.App delegate
呼叫
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
StartupCommandsBuilder()
.setKeyWindow(window!)
.build()
.forEach { $0.execute() }
return true
}
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使用命令模式的好處是,如果要新增新的配置,設定完後只要加在StartupCommandsBuilder
中就可以了.App delegate
中不需要新增任何內容.
但這樣做只能將didFinishLaunchingWithOptions
中的程式碼解耦,App delegate
中的其他方法怎樣解耦呢?
2.組合模式
組合模式: 可以將物件組合成樹形結構來表現"整體/部分"層次結構. 組合後可以以一致的方法處理個別對象以及組合物件.
這邊我們給App delegate
每個功能模組都設定一個子類,每個子類包含所有App delegate
的方法.
1. 每個子模組實現各自的功能
// 推送
class PushNotificationsAppDelegate: AppDelegateType {
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
print("推送配置")
return true
}
func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
print("推送相關程式碼...")
}
// 其餘方法
}
// 外觀樣式
class AppearanceAppDelegate: AppDelegateType {
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
print("外觀樣式配置")
return true
}
}
// 控制器處理
class ViewControllerAppDelegate: AppDelegateType {
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
print("根控制器設定程式碼")
return true
}
}
// 第三方庫
class ThirdPartiesConfiguratorAppDelegate: AppDelegateType {
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
print("第三方庫初始化程式碼")
return true
}
func applicationDidEnterBackground(_ application: UIApplication) {
print("ThirdPartiesConfiguratorAppDelegate - applicationDidEnterBackground")
}
func applicationDidBecomeActive(_ application: UIApplication) {
print("ThirdPartiesConfiguratorAppDelegate - applicationDidBecomeActive")
}
}
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2. 管理者
typealias AppDelegateType = UIResponder & UIApplicationDelegate
class CompositeAppDelegate: AppDelegateType {
private let appDelegates: [AppDelegateType]
init(appDelegates: [AppDelegateType]) {
self.appDelegates = appDelegates
}
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
appDelegates.forEach { _ = $0.application?(application, didFinishLaunchingWithOptions: launchOptions) }
return true
}
func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
appDelegates.forEach { _ = $0.application?(application, didRegisterForRemoteNotificationsWithDeviceToken: deviceToken) }
}
func applicationDidEnterBackground(_ application: UIApplication) {
appDelegates.forEach { _ = $0.applicationDidEnterBackground?(application)
}
}
func applicationDidBecomeActive(_ application: UIApplication) {
appDelegates.forEach { _ = $0.applicationDidBecomeActive?(application)
}
}
}
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3.App delegate
呼叫
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
let appDelegate = AppDelegateFactory.makeDefault()
enum AppDelegateFactory {
static func makeDefault() -> AppDelegateType {
return CompositeAppDelegate(appDelegates: [
PushNotificationsAppDelegate(),
AppearanceAppDelegate(),
ThirdPartiesConfiguratorAppDelegate(),
ViewControllerAppDelegate(),
]
)
}
}
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
_ = appDelegate.application?(application, didFinishLaunchingWithOptions: launchOptions)
return true
}
func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
appDelegate.application?(application, didRegisterForRemoteNotificationsWithDeviceToken: deviceToken)
}
func applicationDidBecomeActive(_ application: UIApplication) {
appDelegate.applicationDidBecomeActive?(application)
}
func applicationDidEnterBackground(_ application: UIApplication) {
appDelegate.applicationDidEnterBackground?(application)
}
}
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在App delegate
解耦中相比命令模式,使用組合模式的可自定義程度會更高一點.
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