小编rin*_*923的帖子

永远不会使用不可变值'textfieldInt'的初始化; 考虑将赋值替换为'_'或删除它和textfield2Int

我为textfieldInt收到两次警告

这是我的所有代码:

class ViewController: UIViewController {

    @IBOutlet weak var textField1: UITextField!
    @IBOutlet weak var textField2: UITextField!
    @IBOutlet weak var output: UILabel!

    @IBAction func calculate(_ sender: AnyObject) {
        let textfieldInt: Int? = Int(textField1.text!)
        let textfield2Int: Int? = Int(textField2.text!)
        let convert = textField1.text! + textField2.text!
        let convertText = String(convert)
        output.text = convertText

}