如何将Float Type的十进制值存储在变量中（Swift）

Question

我有一个应用程序的开头，人们可以在他们将要发出的演讲中输入单词的数量，并且它将根据谈话速度计算演讲将花费多长时间。我希望应用程序能够存储变量“sum”的唯一十进制值，以便我可以将其转换为分钟和秒。这是下面的一个按钮的代码和UI的快照，提前谢谢你。 http://imgur.com/gallery/ZmKtekJ/new

    @IBAction func slow(sender: UIButton) {
    let buttonPressed : Bool = true
    let a = (text1.text as NSString!).doubleValue
    let b : Int = 100
    let sum = Float(a) / Float(b)
    result.text = "\(sum) minutes"

    if sum >= 60 {
        let hour = Float(sum) / Float(60.0)
        let sum = "\(hour)"
        result.text = "\(sum) hours"

    }

    if buttonPressed {

        self.view.endEditing(true)
    }

}

Answer 1

您可以使用%运算符，它可以为您提供“休息”功能。例如：

70 % 60.0 = 10

修改

不确定你想通过字符串doubleValue得到什么，但我在我的例子中使用了字符数：

@IBAction func slow(sender: UIButton) {
    let buttonPressed = true
    let a = text1.text!.characters.count
    let b = 100
    let sum = a / b
    result.text = "\(sum) minutes"

    if sum >= 60 {
        let h = sum / 60
        let m = sum % 60
        if m != 0 {
            result.text = "\(h) hours and \(m) minutes"
        } else {
            result.text = "\(h) hours"
        }
    } else {
        result.text = "\(sum) minutes"
    }

    if buttonPressed {
        view.endEditing(true)
    }
}

Answer 2

@IBAction func slow(sender: UIButton) {
let buttonPressed = true
// stores input in var a as a double
var a = double(text1.text)! 
// defines constant b
let b = 100
// calculates sum
var sum = a / b
//calculates hours
var hours = sum / 60
//calculates minutes
var minutes = sum % 60

// if there are 1 or more hours and 1 or more minutes result displays
// hours and minutes
if hours > 0 && minutes != 0 {
    result.text = "\(hours) hours and \(minutes) minutes"
//if there are no minutes result just displays hours  
} else if minutes == 0{
    result.text = "\(hours) hours"
//if there are no hours result just displays minutes
} else if hours == 0 {
    result.text = "\(minutes) minutes"
}

您可能还想进行一些输入验证，以确保用户不会输入会导致整个房屋倒塌的字母。