ios - 检查/验证文本字段只能是 1 - 80

Question

我想知道检查/验证只能从 1 - 80 输入的影响文本字段的最简单方法是什么？我的编码仍然很生疏，我尝试执行“if (Int(impact.text!) != 1...80)”，但它不起作用。

View Controller

import UIKit
import FirebaseDatabase

class TryingOut2Controller: UIViewController {

    @IBOutlet var titleLabel: UILabel!
    @IBOutlet var impact: UITextField!
    @IBOutlet var rigour: UITextField!
    @IBOutlet var response: UITextField!
    @IBOutlet var total: UILabel!

    override func viewDidLoad() {
        super.viewDidLoad()
        titleLabel.text = postData[myIndex]

        impact.addTarget(self, action: #selector(textChanged), for: .editingChanged)
        rigour.addTarget(self, action: #selector(textChanged), for: .editingChanged)
        response.addTarget(self, action: #selector(textChanged), for: .editingChanged)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @objc func textChanged() {
        let impactValue = Int(impact.text!)
        let rigourValue = Int(rigour.text!)
        let responseValue = Int(response.text!)
        total.text = String(describing:
            (impactValue ?? 0) + (rigourValue ?? 0) + (responseValue ?? 0)
        )
    }

    @IBAction func button1(_ sender: Any) {

        if (Int(impact.text!) != 1...80)
        {
            //create alert
        }
        else {

        }

Answer 1

最好的方法是向您的 textField 添加一个操作方法“编辑已更改”:并检查您的文本字段是否具有大于 80 的值

   @IBAction func valueChange(_ sender: Any) {
          if let number = Int(self.impact.text!){
               if number > 80 || number < 0 {
                    let alert = UIAlertController(title: "Error", message: "Enter a Valid Number", preferredStyle: .alert)
                    let alertAction = UIAlertAction(title: "OK", style: .default, handler: nil)
                    alert.addAction(alertAction)
                    self.present(alert, animated: true, completion: nil)
               }
          }
     }