Swift 3 Xcode - 以整數顯示電池電量

Question

我正在製作應用程序以使用Swift讀取電池電量百分比！ 現在我的是這樣的： 61.0％或24.0％或89.0％ 我試圖解決的是擺脫.0所以它是一個Int。 這是我到目前爲止的代碼：

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() 
} 

} 

我已經試過這樣的事情：

var realBatteryLevel = Int(batteryLevel) 

不過，我得到這個error

我已經嘗試過其他方法，但如果運氣好的話沒有。請，任何解決方案將是真棒！提前致謝！

編輯

我正考慮浮batteryLevel爲一個字符串，然後用‘’代替」 .0" ，我看到了這個地方，但是，我不知道怎麼辦！

Answer 1

試試這個：

func someFunction() { 
    self.infoLabel.text = String(format: "%.0f%%", batteryLevel * 100) 
} 

以供將來參考，所有字符串格式說明是listed here。

Answer 2

你只需要將其轉換自己的函數中：

func someFunction() { 
self.infoLabel.text = "\(Int(batteryLevel * 100))%" } 

Answer 3

或者，你可以爲batteryLevel創建一個Int計算性能：

var batteryLevel: Int { 
    return Int(round(UIDevice.current.batteryLevel * 100)) 
} 

請注意，您可能無法獲得電池電量。您應該測試這一點，顯示不同的字符串：

if UIDevice.current.batteryState == .unknown { 
    self.batteryLevelLabel.text = "n/a" 
} else { 
    self.batteryLevelLabel.text = "\(self.batteryLevel)%" 
} 

還要注意，而不是運行的計時器來獲取電池電量，您應該訂閱.UIDeviceBatteryLevelDidChange通知。該視圖控制器的「肉」來處理這一切可能如下：

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 
    } 
}