Sum of 3 UITextField? [closed]

问题

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Closed 2 years ago.

https://ibb.co/nH38wG

Why the result is 123 and not 6 ?

Anyone is able to elaborate and explain it to me please?

回答1:

You are adding the text (String) values to each other in the label text. You should do this instead:

guard let num1 = Int(textField1.text),
    let num2 = Int(textField2.text),
    let num3 = Int(textField3.text) else {
    return
}

let sum = num1 + num2 + num3
label.text = str+sum

回答2:

You are "summing" strings. "1"+"2"+"3"="123". Convert it to a number: Int("1")+Int("2")+Int("3")=6.

label.text = str + Int(textField1.text!)! + Int(textField2.text!)! + Int(textField3.text!)!

来源：https://stackoverflow.com/questions/46521131/sum-of-3-uitextfield