ios - 让一个按钮减去我按下的下一个按钮的值。 swift

Question

我的计数应用程序中有七个标记为 1-7 的按钮。计数从 0 开始，然后当我按一个数字时，它会加到 0。所以如果我按 6，计数为 6。然后我按 3，计数现在为 9。现在我想包括一个减法按钮，这样我就可以通过点击减法按钮来下降，然后选择我选择的值。因此，如果我点击减法按钮，然后点击数字 2，计数将回到 7。

    import UIKit

class ViewController: UIViewController {

@IBOutlet weak var Score: UILabel!

var number = 0

@IBAction func oneButton(_ sender: UIButton) {

    var number1 = number + 1
    number = number1
    var realNumber = String(number)
    Score.text = realNumber

}


@IBAction func twoButton(_ sender: UIButton) {

    var number1 = number + 2
    number = number1
    var realNumber = String(number)
    Score.text = realNumber

}


@IBAction func threeButton(_ sender: UIButton) {

    var number1 = number + 3
    number = number1
    var realNumber = String(number)
    Score.text = realNumber

}


@IBAction func fourButton(_ sender: UIButton) {

    var number1 = number + 4
    number = number1
    var realNumber = String(number)
    Score.text = realNumber

}


@IBAction func fiveButton(_ sender: UIButton) {

    var number1 = number + 5
    number = number1
    var realNumber = String(number)
    Score.text = realNumber

}


@IBAction func sixButton(_ sender: UIButton) {

    var number1 = number + 6
    number = number1
    var realNumber = String(number)
    Score.text = realNumber

}


@IBAction func sevenButton(_ sender: UIButton) {

    var number1 = number + 7
    number = number1
    var realNumber = String(number)
    Score.text = realNumber

}


@IBAction func foulButton(_ sender: UIButton) {



}

}

我不确定应该在 foulButton 函数中放入什么代码。提前谢谢你。

Answer 1

我首先为每个按钮提供“标签”及其数值，然后您可以对所有按钮使用一个函数。那么模拟一个减法就很容易了。

var subtraction = false

@IBAction func buttonAction(_ sender: UIButton) {

    var change = sender.tag
    if subtraction {
       change = change * (-1)
       subtraction = false
    } 

    number = number + change    
    Score.text = String(number)
}

@IBAction func foulButton(_ sender: UIButton) {
    subtraction = !subtraction
}