Question

import UIKit

class ViewController: UIViewController {
@IBOutlet weak var Screen: UILabel!
var firstNumber = Float()
var secondNumber = Float()
var result = Float()
var operation = ""
var isTypingNumber = false
@IBAction func Number(sender: AnyObject) {
    isTypingNumber = false
    var number = sender.currentTitle
    if isTypingNumber == true {
        Screen.text = Screen.text! + number!!;
    } else {
        Screen.text = number!!;
    }
    isTypingNumber = true
}
@IBAction func Operation(sender: AnyObject) {
    operation = sender.currentTitle!!
    isTypingNumber = false
    firstNumber = Screen.text!.toInt()!
}
@IBAction func Equals(sender: AnyObject) {
    secondNumber = Screen.text!.toInt()!
    isTypingNumber = false
    if operation == "+" {
        result = firstNumber + secondNumber;
    } else if operation == "-" {
        result = firstNumber - secondNumber;
    } else if operation == "x" {
        result = firstNumber * secondNumber;
    } else if operation == "/" {
        result = firstNumber / secondNumber;
    }
    Screen.text = "\(result)"
}
@IBAction func Clear(sender: AnyObject) {
    firstNumber = 0
    secondNumber = 0
    result = 0
    Screen.text = "\(result)"
}
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


}

这是我的代码。我总是得到错误'Int'在firstNumber = Screen.text！.toInt（）上无法转换为'Float'！和secondNumber = Screen.text！.toInt（）！
我试图在UILabel（屏幕）上显示一个浮动。我该怎么办？有人能告诉我如何在UILabel中使用浮点数。这是斯威夫特。

谢谢，罗希特夏尔

Answer 1

您正在尝试将Int值分配给Float类型的变量。这在swift中是不允许的。你可以尝试

let floatValue = (label.text as NSString).floatValue

并在floatValue中显示UILabel，您可以在swift中使用字符串插值。

label.text = "\(floatValue)"

要将Int转换为Float，您可以

floatValue = Float(intValue)

Answer 2

问题是您将firstNumber声明为Float，但是您要为该变量分配一个Int值。

变化：

firstNumber = Screen.text!.toInt()!

到

firstNumber = (Screen.text! as NSString).floatValue

注意：类似也适用于secondNumber。

Answer 3

你可以试试这个：

@IBAction var label:UILabel!
var a:Float=1938.22

override func viewDidLoad(){
   super.viewDidLoad()
   label.text="\(a)"
}

如何在Swift中的UILabel上显示Float值？

3 个答案: