单击按钮时如何使计数器工作？

Question

因此，我是编码的新手，只要您单击同一按钮，我就希望使标签更改其文本。这样做是尽管您可以将变量绑定到内部，但如果使用if语句，则隐藏起来不起作用。这是代码：

@IBAction func buttonOne(_ sender: Any)
{
    var nextText:Int = 1
    nextText += 1

    if nextText == 2
    {
        labelOne.text = "We have a developing situation."
    }

    if nextText == 3
    {
        labelOne.text = "About forty five minutes ago 15 unknown assailant broke into Chicago 1st State Bank"
    }

    if nextText == 4
    {
        labelOne.text = "They are armed and dangerous and have taken numerous hostages"
    }

    if nextText == 5
    {
        labelOne.text = "Your mission is to take you and your partner in to bank and free the hostages"
    }

    if nextText == 5
    {
        labelOne.text = "You shall enter the bank via helicopter and rappel onto the roof, good luck."
    }
}

Answer 1

在按钮点击功能范围之外声明nextText

var nextText:Int = 1
@IBAction func buttonOne(_ sender: Any)
{

    nextText += 1

    switch nextText{
     case 2 : labelOne.text = "We have a developing situation."
     case 3 : labelOne.text = "About forty five minutes ago 15 unknown assailant broke into Chicago 1st State Bank"
     case 4 : labelOne.text = "They are armed and dangerous and have taken numerous hostages"
     case 5 : labelOne.text = "Your mission is to take you and your partner in to bank and free the hostages"
     case 6 : labelOne.text = "You shall enter the bank via helicopter and rappel onto the roof, good luck."
     default : labelOne.text = ""
    }
}