有时候需求需要我们把手机号码在输入时做特殊处理，比如这样
extension String {
func formatPhoneNumberWithOriginalPhoneNumber() -> String {
var text = self
if text.contains(" ") {
text = text.replacingOccurrences(of: " ", with: "")
}
var res = text
if text.length > 3 {
res.insert(" ", at: text.index(text.startIndex, offsetBy: 3))
if text.length >= 9 {
res.insert(" ", at: res.index(text.startIndex, offsetBy: 8))
}
}
return res
}
}
！！！敲黑板，划重点
以下这段不是UITextFieldDelegate
它是给你的输入框添加的事件，当然你也可以用监听
textField.addTarget(self, action: #selector(self.textFieldDidChange(_:)), for: .editingChanged)
func textFieldDidChange(_ textField: UITextField) {
if let text = textField.text {
if phoneTextField == textField {
phoneTextField.text = text.formatPhoneNumberWithOriginalPhoneNumber()
}
}
}
