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swift - 如何使用我输入的 UITextField 值作为 swift 函数的参数值?

转载 作者:行者123 更新时间:2023-11-28 09:08:53 28 4
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我需要能够获取我的 UITextField 值并将其用作 Double 来执行我函数中的计算;但是它没有返回正确的值。我想计算总金额并将其乘以百分比折扣。这是我的代码:

//Text Fields
@IBOutlet weak var amountTextField: UITextField!
@IBOutlet weak var percentDiscountTextField: UITextField!

func calculateAmount(percentage: Double) -> Double{

var percentage = (percentDiscountTextField.text as NSString).doubleValue
return (amountTextField.text as NSString).doubleValue - ((amountTextField.text as NSString).doubleValue * percentage)/100
}

@IBAction func calculatePressed(sender: AnyObject) {

var alert = UIAlertController(title: "Alert", message: "Please Enter a Value", preferredStyle: UIAlertControllerStyle.Alert)

if (count(amountTextField.text) == 0){

alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.Default, handler: nil))
self.presentViewController(alert, animated: true, completion: nil)

} else if (count(percentDiscountTextField.text) == 0){

alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.Default, handler: nil))
self.presentViewController(alert, animated: true, completion: nil)

} else {

var finalPrice: Double = calculateAmount()

}

}

最佳答案

我有点困惑为什么 calculateAmount 方法需要一个参数,但是当你调用它时你却没有提供一个参数?

我假设 calculateAmount 不应该接受任何参数,下面是我编写方法的方式:

func calculateAmount() -> Double? {
let percentageFromTextField = (percentDiscountTextField.text as NSString).doubleValue
let percentageOff = percentageFromTextField / 100.0

// Best to check the user entered a value in the correct range!
// Perhaps you could display a message saying the percentage discount
// wasn't in the correct range (if nil is returned)
if percentageOff < 0 || percentageOff > 1 { return nil }

let amount = (amountTextField.text as NSString).doubleValue
return amount * (1 - percentageOff)
}

希望对您有所帮助!

关于swift - 如何使用我输入的 UITextField 值作为 swift 函数的参数值?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/30000194/

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