我正在为我的孩子做一个简单的盾牌应用程序，我是斯威夫特的新手，我提前为糟糕的代码道歉。我是从Youtube上的一个教程中学到的。

import Foundation
import FamilyControls
import DeviceActivity
import ManagedSettings
import SwiftUI

extension DeviceActivityName {
    static let daily = Self("daily")
}

struct Testing_SwiftUIApp: App {
    var body: some Scene {
        
        WindowGroup {
            ContentView()
        }
        
        class MyMonitor: DeviceActivityMonitor {
            let store = ManagedSettingsStore()
           
            override func intervalDidStart(for activity: DeviceActivityName) {
                
                self.superBS_Start()

//它返回在范围内找不到MyModel（）。

let model = MyModel()
                let applications = model.selectionToDiscourage.applications
                store.shield.applications = applications?.isEmpty ? nil : applications
            }
            
            override func intervalDidEnd(for activity: DeviceActivityName) {
                
                self.superBS_End()
                store.shield.applications = nil
            }
        }
        func superBS_Start(){
            super.intervalDidStart(for: activity)
        }
        func superBS_End(){
            super.intervalDidEnd(for: activity)
        }
                
        let schedule = DeviceActivitySchedule(
            intervalStart: DateComponents(hour: 0, minute: 0),
            intervalEnd: DateComponents(hour:23, minute: 59),
            repeats: true
        )
        
        let center = DeviceActivityCenter()
        try center.startMonitoring(.daily, during: schedule)

//它返回在范围内找不到MyModel（）。

@StateObject var model = MyModel()
        @State var isPresented = false
        
        var body: some View {
            Button ("Select Apps to Discourage"){
                isPresented = true
            }
            .familyActivityPicker(isPresented: $isPresented,
                                  selection: $model.selectionToDisourage)
        }
    }
}

我不知道为什么它不在范围内。很抱歉我是斯威夫特的新手。