在Apple Watch上显示iPhone的电池

Question

我正在尝试在我的Apple Watch应用程序的标签上显示iPhone的剩余电池电量。我试过使用WatchConnectivity并在iPhone和Apple Watch之间发送消息，但没有奏效。有什么办法可以做到吗？

Answer 1

首先只是使电池监测：

UIDevice.current.isBatteryMonitoringEnabled = true 

然后您可以创建一个计算属性返回电池电量：

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

要监测设备的电池水平，你可以添加一个观察员UIDeviceBatteryLevelDidChange通知：

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

您可以也验证了电池状态：

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." 

并添加观察员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") 
    } 
} 

现在，你有你需要的关于你的电池的所有属性。只要通过他们的手表！

希望这会有所帮助。