如何解决获取@EnvironmentObject到NSObject类
我有一个简单的ObservableObject
类,该类在App.swift文件中初始化并传递到第一个视图:
final class Counter: ObservableObject {}
@main
struct MyCoolApp: App {
@UIApplicationDelegateAdaptor(AppDelegate.self)
private var appDelegate
private let counter = Counter()
var body: some Scene {
WindowGroup {
ContentView()
.environmentObject(counter)
}
}
}
这很好,但是现在我需要从通知代表那里进行了解。本质上我有这个:
class AppDelegate: NSObject,UIApplicationDelegate {
let notificationDelegate: NotificationDelegate
func registerForPushNotifications(application: UIApplication) {
// irrelevant code removed.
let center = UNUserNotificationCenter.current()
center.delegate = self?.notificationDelegate
}
}
class NotificationDelegate: NSObject,UNUserNotificationCenterDelegate {
}
在我的NotificationDelegate
类中,如何访问我实例化的Counter
类?
解决方法
这里是一种可能的方式-使用共享实例(因为在您的方案中,无论如何它仅使用一个实例)
final class Counter: ObservableObject {
static let shared = Counter()
}
struct MyCoolApp: App {
@UIApplicationDelegateAdaptor(AppDelegate.self)
private var appDelegate
private let counter = Counter.shared
// ...
}
...
class NotificationDelegate: NSObject,UNUserNotificationCenterDelegate {
// use in delegate callbacks Counter.shared where needed
}
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