Check Battery Level iOS Swift [closed]

Question

I just started Swift and I have been looking for a way to check the battery level. I found this resource and have been playing around with it but for some reason can't seem to get it to work.

I wasn't quite sure how to go about fixing this. Any ideas?

Answer 1

Xcode 11 • Swift 5.1

First just enable battery monitoring:

UIDevice.current.isBatteryMonitoringEnabled = true 

Then you can create a computed property to return the battery level:

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 } 

To monitor your device battery level you can add an observer for the UIDevice.batteryLevelDidChangeNotification:

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) } 

---

You can also verify the battery state:

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." 

---

and add an observer for UIDevice.batteryStateDidChangeNotification:

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")     } }