如何隐藏 TextField 上的中间字符

Question

将输入一个11个字符的数字，隐藏这11个字符的中间字符。我该怎么做？

Answer 1

其中一种解决方案是使用 replacingCharacters 方法：

var someStr = "12345678901"

func replaceMiddle(of text: String, withCharacter character: String, offset: Int) -> String {
    let i1: String.Index = text.index(text.startIndex, offsetBy: offset)
    let i2: String.Index = text.index(text.endIndex, offsetBy: -1 * offset)
    let replacement = String(repeating: character, count: text.count - 2 * offset)
    return text.replacingCharacters(in: i1..<i2, with: replacement)
}

print(replaceMiddle(of: someStr, withCharacter: "*", offset: 3))
// prints "123*****901"

Answer 2

您需要实现UITextFieldDelegate，然后您可以使用@pawello2222 生成替换字符串

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
    var newText = ((textField.text ?? "") as NSString).replacingCharacters(in: range, with: string)

    if NEED_TO_CHANGE_STRING {
        textField.text = NEW_STRING
        return false // Return false to prevent the UITextField to add the new changes since you have just overriten them
    }
    return true // Return true will make the UITextField update automatically
}

如何隐藏 TextField 上的中间字符

How can I hide middle characters on TextField

xcode

delegates

textfield

swift