所以我创建了一个应用程序，它应该可以获取每分钟的单词数。如何使用SwithUI启动不在ContentView中的计时器

import SwiftUI
import Combine

class TimerManager: ObservableObject {
    @Published var wordCount: Int = 0
    private var timer: Timer?
    
    init() {
        startTimer()
    }
    
    func startTimer() {
        timer = Timer.scheduledTimer(withTimeInterval: 60, repeats: true) { [weak self] _ in
            self?.wordCount += 1
        }
        timer?.tolerance = 0.1
        RunLoop.current.add(timer!, forMode: .common)
    }
    
    func stopTimer() {
        timer?.invalidate()
        timer = nil
    }
}

struct ContentView: View {
    @StateObject private var timerManager = TimerManager()
    
    var body: some View {
        VStack {
            Text("Word Count: \(timerManager.wordCount)")
                .font(.largeTitle)
                .padding()
            
            // 其他视图组件
        }
    }
}

@main
struct YourAppNameApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}