如何在iOS Swift中将点更改为密码字段中的另一个字符

我有一个文本字段，我想隐藏密码时将默认点字符替换为其他字符。 有没有办法轻松做到这一点？

Answer 1

这里有2个选项：

1. 使用没有安全输入选项的普通文本字段。 当用户输入字符时，将其保存为字符串变量，并在文本字段中将其替换为您要呈现的字符而不是项目符号。

这是代码（将密码显示为$$$$）：

var password: String = "" func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool { password = password+string textField.text = textField.text+"$" println("\(password)") return false } 

2. 看看这里的答案： UITextField secureTextEntry子弹与自定义字体？

Answer 2

基于Ron.Kliffer的想法，我已经实现了可行的完整代码：

 // // PasswordTextField.swift // CrifanLibSwift // // Created by licrifan on 16/7/8. // Copyright © 2016年 licrifan. All rights reserved. // import UIKit class PasswordTextField: CommonTextField, UITextFieldDelegate { var realText:String { didSet { print("self.text=\(self.text), realText=\(realText)") updateMaskStr() } } var maskChar:Character init(frame: CGRect = CGRectZero, maskChar:Character = "*") { print("frame=\(frame), maskChar=\(maskChar)") self.realText = "" self.maskChar = maskChar super.init(frame: frame) self.secureTextEntry = false self.addTarget(self, action: #selector(self.textFiledEditingChanged(_:)), forControlEvents: UIControlEvents.EditingChanged) self.delegate = self } required init?(coder aDecoder: NSCoder) { fatalError("init(coder:) has not been implemented") } func updateMaskStr(){ print("before update: self.text=\(self.text), self.realText=\(self.realText)") //change real text to mask char var maskStr = "" for _ in self.realText.characters { maskStr += String(self.maskChar) } self.text = maskStr print("after update: self.text=\(self.text), self.realText=\(self.realText)") } func textFiledEditingChanged(textField: UITextField) { print("textField=\(textField), textField.text=\(textField.text)") updateMaskStr() } func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool { print("textField=\(textField), range=\(range), string=\(string)") var allow = true let curText = self.realText let updatedStr:String = (curText as NSString).stringByReplacingCharactersInRange(range, withString: string) if updatedStr.characters.count > LoginRegisterPasswordLengthMax { print("password exceed max length \(LoginRegisterPasswordLengthMax)") allow = false } if allow { self.realText = updatedStr } print("curText=\(curText), updatedStr=\(updatedStr), self.realText=\(self.realText)") return false } } 

在另一个视图EditInfoView.swift ，使用它：

 class EditInfoView: UIView { var passwordTextField:PasswordTextField init(editMode:EditInfoMode) { self.passwordTextField = PasswordTextField() self.addSubview(self.passwordTextField) if self.passwordTextField.notHidden { //5. password text var passwordPlaceholder = "密码(6-20位)" if self.editMode == .ChangeLoginPassword { passwordPlaceholder = "旧密码(6-20位)" } else if self.editMode == .ForgotPassword { passwordPlaceholder = "输入新密码(6-20位)" } self.passwordTextField.placeholder = passwordPlaceholder self.passwordTextField.returnKeyType = UIReturnKeyType.Go // self.passwordTextField.secureTextEntry = true constrain(passwordTextField, smsCodeTextField, phoneTextField) {passwordTextField, smsCodeTextField, phoneTextField in passwordTextField.centerX == passwordTextField.superview!.centerX passwordTextField.width == passwordTextField.superview!.width - 2 * LoginRegisterPaddingX passwordTextField.height == CommonTextFieldHeight if self.editMode == .ChangeLoginPassword { passwordTextField.top == passwordTextField.superview!.top + EditInfoViewTopPadding } else { passwordTextField.top == smsCodeTextField.bottom + EditInfoViewCommonPaddingY } } } } 

最后在视图控制器EditInfoViewController.swift中实际使用它：

 isValid = validatePassword(self, alertPrefix: alertPrefix, passwordStr: self.editInfoView.passwordTextField.realText, doAlertWhenInvalid: doAlertWhenInvalid) 

最终的效果是：