swift - 如何限制 UIAlertController 上的 UITextField 仅采用指定范围的数字？

Question

我创建了一个带有 UITextField 的 UIAlertController，并且该 UITextField 只需要采用 0-100 之间的整数。

我该怎么做？

这是我的代码

let confirm = UIAlertController(title: "I want to reserve", message: "sometext", preferredStyle: UIAlertControllerStyle.alert)

            confirm.addTextField(configurationHandler: { (textField) in


                textField.placeholder = "Please fill the number between 0-100"

            })

            confirm.addAction(UIAlertAction(title: "No", style: UIAlertActionStyle.default, handler: nil))

            confirm.addAction(UIAlertAction(title: "Yes", style: UIAlertActionStyle.destructive, handler: { (action) in

                self.isReserve = true

                self.reservedIcon.alpha = 0
                self.reservedTitle.alpha = 0

                self.cancelReservedIcon.alpha = 1
                self.cancelReservedTitle.alpha = 1


            }))

Answer 1

let confirm = UIAlertController(title: "I want to reserve", message: "sometext", preferredStyle: UIAlertControllerStyle.alert)

        confirm.addTextField(configurationHandler: { (textField) in


            textField.placeholder = "Please fill the number between 0-100"

        })

        confirm.addAction(UIAlertAction(title: "No", style: UIAlertActionStyle.default, handler: nil))

        confirm.addAction(UIAlertAction(title: "Yes", style: .default, handler: { [weak alert] (_) in
        let textField = alert?.textFields![0]
        if textField.text != "1234" {  // change your if condition
           self.isReserve = true

            self.reservedIcon.alpha = 0
            self.reservedTitle.alpha = 0

            self.cancelReservedIcon.alpha = 1
            self.cancelReservedTitle.alpha = 1
        } else {
           // your else condition
        }
}))