Question

我无法将UITextField转换为Int，但我已经查看了互联网上的说明。我是Swift 2的初学者。有人可以帮忙吗？

import UIKit

class ViewController: UIViewController {

    @IBOutlet var age: UITextField!

    @IBOutlet var resultLabel: UILabel!

    @IBAction func findAge(_ sender: AnyObject) {
        // Changed "enteredAge = age" to "enteredAge = age!"
        var age = Int = Int(age.text)
        var enteredAge = Int(age)

        if enteredAge != nil {

            var catYears = enteredAge! * 7

            resultLabel.text = "Your cat is \(catYears) in cat years"

        } else {

            resultLabel.text = "Please enter a number in the box"

        }

    }

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

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

}

Answer 1

输入年龄再次使用age.text，如年龄变量

Answer 2

正如我在您的代码中看到的那样，您正在重新声明年龄文本字段，我正在编辑您的IBAction。我没有运行此代码，但我认为它对您有用。只需在代码中复制粘贴即可。

@IBAction func findAge(_ sender: AnyObject) {

        var ageToInt =  Int(self.age.text!)!

        if ageToInt != nil {

            var catYears = ageToInt! * 7

            resultLabel.text = "Your cat is \(catYears) in cat years"

        } else {

            resultLabel.text = "Please enter a number in the box"

        }
    }

祝你好运！

从UITextField转换为Int失败

2 个答案: