使用Combine获取枚举发布器

import Combine

enum Status {
    case loading
    case success
    case failure
}

class StatusPublisher {
    @Published var status: Status = .loading
    private var cancellables: Set<AnyCancellable> = []

    init() {
        // 模拟状态变化
        DispatchQueue.main.asyncAfter(deadline: .now() + 2) {
            self.status = .success
        }
        DispatchQueue.main.asyncAfter(deadline: .now() + 4) {
            self.status = .failure
        }

        // 订阅状态变化
        $status
            .sink { newStatus in
                print("New status: \(newStatus)")
            }
            .store(in: &cancellables)
    }
}

let statusPublisher = StatusPublisher()

import Combine

class StatusPublisher {
    @Published var status: Status = .loading
    @Published var objectWillChange = PassthroughSubject<Void, Never>()

    init() {
        // 模拟状态变化
        DispatchQueue.main.asyncAfter(deadline: .now() + 2) {
            self.status = .success
            self.objectWillChange.send(())
        }
        DispatchQueue.main.asyncAfter(deadline: .now() + 4) {
            self.status = .failure
            self.objectWillChange.send(())
        }

        // 订阅状态变化
        $status
            .sink { newStatus in
                print("New status: \(newStatus)")
            }
            .store(in: &cancellables)
    }
}