Swift 在UILabel中的新行上添加文本

我正在尝试将文本添加到

UILabel

的新行，现在它将替换当前文本

• 如何将文本附加到

  ui标签

• 如何将新行添加到

  ui标签

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你发布的代码有很多问题

首先，明确代码。我们应该能够复制代码，将其粘贴到例如操场中，并且应该可以工作。有时这是不可能的，但在你的情况下是这样的

代码的问题：

• 打开你的眼镜，每一次你都不知道一只独角兽死了
• 不能直接从Swift

  字符串转换为
  Int

此方法将

字符串

转换为

Int

，不会产生可选值

// elaborate for extra clarity
let forUsTextNSString = forUsText as NSString
let forUSTextFloat = forUsTextNSString.floatValue
input1 = Int(forUSTextFloat)

这是更新的代码，它现在编译：

// stuff I used to test this
var forUs = UILabel(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
var forThem = UILabel(frame: CGRect(x: 0, y: 0, width: 100, height: 100))

var us = UILabel(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
var them = UILabel(frame: CGRect(x: 0, y: 0, width: 100, height: 100))

// more stuff I used to test this
var input1 : Int = 0
var input2 : Int = 0
var input1total : Int = 0
var input2total : Int = 0

func sign() { // changed to non IB method, don't copy and paste this

    // unwrap some optionals (google nil coalescing operator)
    let forUsText = forUs.text ?? ""
    let forThemText = forThem.text ?? ""
    var usText = us.text ?? ""
    var themText = them.text ?? ""

    // elaborate way to convert String to Int (empty string returns a 0)
    let forUsTextNSString = forUsText as NSString
    let forUSTextFloat = forUsTextNSString.floatValue
    input1 = Int(forUSTextFloat)

    // compact method
    input1 = Int((forUsText as NSString).floatValue)
    input2 = Int((forThemText as NSString).floatValue)

    forUs.text = ""
    forThem.text = ""

    input1total += input1
    input2total += input2

    us.text = "\(input1total)"
    them.text = "\(input2total)"


    if ( input1total >= 152){
        print("you win")

    }
    if (input2total >= 152){
        print("you lose")
    }    
}

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现在回答问题：

• UILabel

  有一个属性

  numberOfLines

• \n

  用于在文本中插入换行符

增加

numberOfLines

，并在新文本之前添加带有

\n

的新文本

usText += "\n\(input1total)"
themText += "\n\(input2total)"

// change += 1 to = 2 if that is what you actually need
us.numberOfLines += 1
them.numberOfLines += 1

us.text = usText
them.text = themText

---

@MohammedAlsaiari没问题，如果你喜欢答案，别忘了投票。

usText += "\n\(input1total)"
themText += "\n\(input2total)"

// change += 1 to = 2 if that is what you actually need
us.numberOfLines += 1
them.numberOfLines += 1

us.text = usText
them.text = themText