Watchos中的本地通知窗帘颜色

Question

我正在尝试更改WatchKit应用程序中本地通知的窗扇颜色：

import SwiftUI
import UserNotifications

class myHostingController: WKUserNotificationHostingController<NotificationView> {
    let sashColor = sashColor
}

func addNotification() {
    let center = UNUserNotificationCenter.current()
    let sashColor = myHostingController.sashColor
    
    let addRequest = {
        let content = UNMutableNotificationContent()
        content.title = "Title content"
        content.sound = UNNotificationSound.default
        sashColor?.foregroundColor(.blue)
        
        let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 5, repeats: false)
        let request = UNNotificationRequest(identifier: UUID().uuidString, content: content, trigger: trigger)
        center.add(request)  
    }

我收到错误消息

呼叫“前景彩色”的结果未使用

我不知道如何调用sashcolor。任何见解都将不胜感激。

根据文档应该可以定制窗框颜色：

最终/developer.apple.com/design/human-interface-guidelines/components/system-experiences/notifications