ios - 计算并显示为标签

Question

我想计算每轮跑动次数并显示在跑动率标签上。

如您在我的代码中所见，运行速率将随着我使用步进器进行运行和运行而发生变化。

运行速率需要显示到小数点后 2 位(例如 4.50 或 10.74 等)

我想创建函数，但我不知道如何计算。

我该怎么做？

// RUNS

var runsInt = 0
var oversFloat: Float = 0.0
var runRate: Double = 0.0

@IBOutlet weak var runsLabel: UILabel!
@IBOutlet weak var displayRunsLabel: UILabel!
@IBOutlet weak var oversLabel: UILabel!
@IBOutlet weak var oversRectangle: UILabel!
@IBOutlet weak var displayOversLabel: UILabel!
@IBOutlet weak var runRateLabel: UILabel!
@IBOutlet weak var displayRunRateLabel: UILabel!

@IBAction func RunStepper(_ sender: UIStepper) {
let runsValue = Int(sender.value)
displayRunsLabel.text = String(runsValue)
}

// OVERS
 @IBAction func OversStepper(_ sender: UIStepper) {
    let value = Int(sender.value)
    let remainder = value % 10
    if remainder == 6 {
        sender.value = Double(value + 4)
    } else if remainder == 9 {
        sender.value = Double(value - 4)
    }
    displayOversLabel.text = String(format: "%.1f", sender.value / 10)   
}

Answer 1

我用了this page有关计算运行率的信息。

runRate = (total runs scored)/(total overs faced)

注意:如果 overs 为 47.5，则步进值将为 475.0 并且 oversInt 将设置为 475。计算runRate时，47.5 实际上代表 47 5/6 我们可以计算为 双(oversInt/10) + Double(oversInt % 10)/6

创建一个名为 calculateRunRate 的函数并 将属性观察器(didSet)添加到runsInt 和oversInt 以触发runRate 的计算。然后，只要这些值中的任何一个发生变化，runRate 都会重新计算，displayRunRate 标签也会更新。

// RUNS

var runsInt = 0 {
    didSet {
        calculateRunRate()
    }
}

@IBOutlet weak var runsLabel: UILabel!

@IBOutlet weak var displayRunsLabel: UILabel!

@IBAction func RunStepper(_ sender: UIStepper) {
    runsInt = Int(sender.value)
    displayRunsLabel.text = String(runsInt)
}


// OVERS

var oversInt = 0 {
    didSet {
        calculateRunRate()
    }
}

@IBOutlet weak var oversLabel: UILabel!
@IBOutlet weak var oversRectangle: UILabel!

@IBOutlet weak var displayOversLabel: UILabel!

@IBAction func OversStepper(_ sender: UIStepper) {
    var value = Int(sender.value)
    let remainder = value % 10
    if remainder == 6 {
        value += 4
    } else if remainder == 9 {
        value -= 4
    }
    sender.value = Double(value)
    oversInt = value

    displayOversLabel.text = String(format: "%.1f", sender.value / 10)
}


// RUN RATE

var runRate = 0.0
let maxOvers = 40.0

@IBOutlet weak var runRateLabel: UILabel!
@IBOutlet weak var displayRunRateLabel: UILabel!
@IBOutlet weak var displayRequiredRunRateLabel: UILabel!

func calculateRunRate() {
    var oversDouble = 0.0

    // Don't divide by zero
    if oversInt == 0 {
        // can this even happen?
        // set runRate to some value that makes sense
        runRate = 0.0
    } else {
        oversDouble = Double(oversInt / 10) + Double(oversInt % 10) / 6
        runRate = Double(runsInt) / oversDouble
    }
    displayRunRateLabel.text = String(format: "%.2f", runRate)

    // required run rate

    let targetScore = Int(targetScoreLabel.text ?? "") ?? 0

    var requiredRunRate = 0.0

    if oversDouble < maxOvers {
        requiredRunRate = Double(targetScore - runsInt) / (maxOvers - oversDouble)
    }

    displayRequiredRunRateLabel.text = String(format: "%.2f", requiredRunRate)
}