Swift 3 Xcode: How to display battery levels as an integer? - ios

Question

I am making an app to read battery percentage using Swift!
Right now my out is something like this:
61.0% or 24.0% or 89.0%
What I'm trying to fix is getting rid of the .0 so it's an Int.
This is my code so far:
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var infoLabel: UILabel!
var batteryLevel: Float {
return UIDevice.current.batteryLevel
}
var timer = Timer()
func scheduledTimerWithTimeInterval(){
timer = Timer.scheduledTimer(timeInterval: 60, target: self, selector: #selector(self.someFunction), userInfo: nil, repeats: true)
}
func someFunction() {
self.infoLabel.text = "\(batteryLevel * 100)%"
}
override func viewDidLoad() {
super.viewDidLoad()
UIDevice.current.isBatteryMonitoringEnabled = true
someFunction()
scheduledTimerWithTimeInterval()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
I have tried something like this:
var realBatteryLevel = Int(batteryLevel)
However, I get this error
I have tried other method but none with any luck. Please, any solutions would be awesome! Thanks in advance!
EDIT
I was considering making the float batteryLevel into a String and then replacing ".0" with "" and I have seen this somewhere, however, I'm not sure how!

Answer 1

Try this instead:
func someFunction() {
self.infoLabel.text = String(format: "%.0f%%", batteryLevel * 100)
}
For future reference, all string format specifiers are listed here.

Answer 2

You just need to convert It inside your function :
func someFunction() {
self.infoLabel.text = "\(Int(batteryLevel * 100))%" }

Answer 3

Alternately, you could create an Int computed property for batteryLevel:
var batteryLevel: Int {
return Int(round(UIDevice.current.batteryLevel * 100))
}
Note that you might not be able to get the battery level. You should test for that and display a different string:
if UIDevice.current.batteryState == .unknown {
self.batteryLevelLabel.text = "n/a"
} else {
self.batteryLevelLabel.text = "\(self.batteryLevel)%"
}
Also note that rather than running a timer to fetch the battery level, you should subscribe to the .UIDeviceBatteryLevelDidChange notification. The "meat" of a view controller that handles all of this might look as follows:
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var batteryLevelLabel: UILabel!
///Holds the notification handler for battery notifications.
var batteryNotificationHandler: Any?
///A computed property that returns the battery level as an int, using rounding.
var batteryLevel: Int {
return Int(round(UIDevice.current.batteryLevel * 100))
}
///A function to display the current battery level to a label,
////or the string "n/a" if the battery level can't be determined.
func showBatteryLevel() {
if UIDevice.current.batteryState == .unknown {
self.batteryLevelLabel.text = "n/a"
} else {
self.batteryLevelLabel.text = "\(self.batteryLevel)%"
}
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
///If we have a battery level observer, remove it since we're about to disappear
if let observer = batteryNotificationHandler {
NotificationCenter.default.removeObserver(observer: observer)
}
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
showBatteryLevel() //display the battery level once as soon as we appear
//Create a notifiation handler for .UIDeviceBatteryLevelDidChange
//notifications that calls showBatteryLevel()
batteryNotificationHandler =
NotificationCenter.default.addObserver(forName: .UIDeviceBatteryLevelDidChange,
object: nil,
queue: nil, using: {
(Notification) in
self.showBatteryLevel()
})
}
override func viewDidLoad() {
super.viewDidLoad()
//Tell UIDevice that we want battery level notifications
UIDevice.current.isBatteryMonitoringEnabled = true
}
}