在Apple Watch上顯示iPhone的電池

Question

我正在嘗試在我的Apple Watch應用程序的標籤上顯示iPhone的剩餘電池電量。我試過使用WatchConnectivity並在iPhone和Apple Watch之間發送消息，但沒有奏效。有什麼辦法可以做到嗎？

Answer 1

首先只是使電池監測：

UIDevice.current.isBatteryMonitoringEnabled = true 

然後您可以創建一個計算屬性返回電池電量：

var batteryLevel: Float { 
    return UIDevice.current.batteryLevel 
} 

要監測設備的電池水平，你可以添加一個觀察員UIDeviceBatteryLevelDidChange通知：

NotificationCenter.default.addObserver(self, selector: #selector(batteryLevelDidChange), name: .UIDeviceBatteryLevelDidChange, object: nil) 
func batteryLevelDidChange(_ notification: Notification) { 
    print(batteryLevel) 
} 

您可以也驗證了電池狀態：

var batteryState: UIDeviceBatteryState { 
    return UIDevice.current.batteryState 
} 
case .unknown // "The battery state for the device cannot be determined." 
case .unplugged // "The device is not plugged into power; the battery is discharging" 
case .charging // "The device is plugged into power and the battery is less than 100% charged." 
case .full  // "The device is plugged into power and the battery is 100% charged." 

並添加觀察員UIDeviceBatteryStateDidChange通知：

NotificationCenter.default.addObserver(self, selector: #selector(batteryStateDidChange), name: .UIDeviceBatteryStateDidChange, object: nil) 
func batteryStateDidChange(_ notification: Notification) { 
    switch batteryState { 
    case .unplugged, .unknown: 
     print("not charging") 
    case .charging, .full: 
     print("charging or full") 
    } 
} 

現在，你有你需要的關於你的電池的所有屬性。只要通過他們的手錶！

希望這會有所幫助。