ios - 检查电池电量 iOS Swift

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Answer 1

Xcode 11 • Swift 5.1

首先启用电池监控:

UIDevice.current.isBatteryMonitoringEnabled = true

然后您可以创建一个计算属性来返回电池电量:

Battery level ranges from 0.0 (fully discharged) to 1.0 (100% charged). Before accessing this property, ensure that battery monitoring is enabled. If battery monitoring is not enabled, battery state is UIDevice.BatteryState.unknown and the value of this property is –1.0.

var batteryLevel: Float { UIDevice.current.batteryLevel }

要监控您的设备电池电量，您可以为 UIDevice.batteryLevelDidChangeNotification 添加观察者:

NotificationCenter.default.addObserver(self, selector: #selector(batteryLevelDidChange), name: UIDevice.batteryLevelDidChangeNotification, object: nil)

---

Battery level ranges from 0.0 (fully discharged) to 1.0 (100% charged). Before accessing this property, ensure that battery monitoring is enabled.
If battery monitoring is not enabled, battery state is UIDevice.BatteryState.unknown and the value of this property is –1.0.

---

@objc func batteryLevelDidChange(_ notification: Notification) {
    print(batteryLevel)
}

---

您还可以验证电池状态:

var batteryState: UIDevice.BatteryState { 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."

---

并为 UIDevice.batteryStateDidChangeNotification 添加一个观察者:

NotificationCenter.default.addObserver(self, selector: #selector(batteryStateDidChange), name: UIDevice.batteryStateDidChangeNotification, object: nil)

---

@objc func batteryStateDidChange(_ notification: Notification) {
    switch batteryState {
    case .unplugged, .unknown:
        print("not charging")
    case .charging, .full:
        print("charging or full")
    }
}