将字符限制分配给特定的UITextField [英] Assigning Character Limit to a Specific UITextField

问题描述

以下代码有效，但适用于所有TextField.如何将其限制为一个特定的TextField?

The following code works but applies to all TextFields. How can I limit it to one specific TextField?

代码:

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {

    let currentCharacterCount = (textField.text?.characters.count) ?? 0
    if (range.length + range.location > currentCharacterCount){
        return false
    }
    let newLength = currentCharacterCount + string.characters.count - range.length
    return newLength <= 9
}

推荐答案

假定您有两个textField，并且您的控制器是这两个的委托.

Assuming that you have two textFields and your controller is a delegate of both.

  @IBOutlet var aMagesticTextField: UITextField!
  @IBOutlet var anotherMagesticTextField: UITextField!

    override func viewDidLoad() {
        super.viewDidLoad()

        aMagesticTextField.delegate = self
        anotherMagesticTextField.delegate = self
    }

在shouldChangeCharactersIn中，对照您已知的文本字段检查textField参数.

In shouldChangeCharactersIn, check the textField parameter against your known text fields.

        if textField == aMagesticTextField {
            //It's aMagesticTextField
        }
        else {
            //It's anotherMagesticTextField
        }

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