ios - Swift - 将不同的最大长度设置为一个 ViewController 内的两个输入字段

Question

我的意图是为两个输入字段设置两个不同的最大长度值，notifTitle 和 notifDescribtion。

到目前为止我有:

 extension CreateNotViewController: UITextFieldDelegate {
    func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
        let maxLength = 15
        let currenString: NSString = textField.text! as NSString
        let newString: NSString = currenString.replacingCharacters(in: range, with: string) as NSString

        return newString.length <= maxLength
    }
}

override func viewDidLoad() {
        super.viewDidLoad()
        notifTitle.delegate = self
        ...
    }

现在如果我还添加 notifDescribtion.delegate = self，它的最大长度也设置为 15 个字符。我如何能够为每个输入字段单独设置最大长度。

Answer 1

您可以在文本字段之间切换

class CreateNotViewController: UIViewController {
    @IBOutlet weak private var notifTitle: UITextField!
    @IBOutlet weak private var notifDescribtion: UITextField!
}

extension CreateNotViewController: UITextFieldDelegate {
    func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
        let maxLength: Int 
        switch textfield {
           case notifTitle:
             maxLenght = 15
           case notifDescribtion:
             maxLenght = 10
           default:
             maxLenght = 0
        }
        let currenString: NSString = textField.text! as NSString
        let newString: NSString = currenString.replacingCharacters(in: range, with: string) as NSString

        return newString.length <= maxLength
    }
}