将字符串中的字符串转换为Int

Question

我有一个按钮，它为尝试分数标签添加1，然后按一个按钮，根据按下的按钮将1或0添加到正确的分数标签。然后将此数据传递给各种viewControllers。在最后一个viewController上我想将标签中的字符串转换为int，然后进行简单的计算以获得百分比。我试过的代码如下。百分比没有显示，所以我认为我没有正确转换它？

在之前的VC上，aScore和cScore被设置为= 0的变量。例如..

var aScore = 0
var cScore = 0

我在VC之间传递数据，然后在最终的viewController上传递以下代码。

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

试试这个

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)

}