將字符串從標籤轉換爲實際

Question

我有一個按鈕，將1加到嘗試分數標籤上，然後再將1或0加到正確的分數標籤上，這取決於按下哪個按鈕。這些數據然後被傳遞給各種viewControllers。在最後一個viewController我想將標籤中的字符串轉換爲一個int，然後做一個簡單的計算，以獲得一個百分比。我試過的代碼如下。百分比沒有被顯示，所以我不認爲我正確地轉換它？

在以前的VC的華擎和cScore被設定爲= 0。例如可變..

var aScore = 0 
var cScore = 0 

我傳遞VC以下代碼出口之間，然後在最終的viewController的數據。

import UIKit 

class gViewController: UIViewController { 


@IBOutlet weak var correctScore: UILabel! 
@IBOutlet weak var attemptScore: UILabel! 
@IBOutlet weak var percentage: UILabel! 

var aScore: Int! 
var cScore: Int! 
var percentage1: Int! 


override func viewDidLoad() { 
    super.viewDidLoad() 

    // Do any additional setup after loading the view. 

    correctScore.text = NSString(format: "%i", cScore) as String 
    attemptScore.text = NSString(format: "%i", aScore) as String 

    let c:Int? = Int(correctScore.text!) 
    let a:Int? = Int(attemptScore.text!) 

    percentage1 = c!/a! 

    percentage.text = NSString(format: "%i", percentage1) as String 
} 

Answer 1

試試這個

override func viewDidLoad() { 
    super.viewDidLoad() 

    // Do any additional setup after loading the view. 

    self.correctScore.text = String(format: "%.1f", cScore) 
    self.attemptScore.text = String(format: "%.1f", aScore) 

    var percentage1 = Float(cScore)/Float(aScore) 

    self.percentage.text = String(format: "%.1f", percentage1) 

}