我认为将所有UITextField textContentType设置为表格UITextContentType("")或.oneTimeCode不是干净的解决方案。启用/禁用isSecureTextEntry仍然会给您同样的问题。
@Gal Shahar的答案很好，但仍然不够完美。掩码的字符与来自Apple的安全输入文本中使用的掩码的字符不同。它应该使用Unicode字符'BLACK CIRCLE'（U + 25CF）https://www.fileformat.info/info/unicode/char/25cf/index.htm
此外，它不处理光标移动。在中间插入文本时，它将光标位置更改为文本的末尾。选择和替换文本时，它将给您错误的值。
当您决定使用自定义isSecureEntryText来避免自动填充密码时，下面的代码是：
Swift 5（简单版）
@IBOutlet weak var passwordTextField: UITextField!
var maskedPasswordChar: String = "●"
var passwordText: String = ""
var isSecureTextEntry: Bool = true {
didSet {
let selectedTextRange = passwordTextField.selectedTextRange
passwordTextField.text = isSecureTextEntry ? String(repeating: maskedPasswordChar, count: passwordText.count) : passwordText
passwordTextField.selectedTextRange = selectedTextRange
}
}
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
if textField == passwordTextField {
if let swiftRange = Range(range, in: passwordText) {
passwordText = passwordText.replacingCharacters(in: swiftRange, with: string)
} else {
passwordText = string
}
textField.text = isSecureTextEntry ? String(repeating: maskedPasswordChar, count: passwordText.count) : passwordText
if let newPosition = textField.position(from: textField.beginningOfDocument, offset: range.location + string.utf16.count) {
textField.selectedTextRange = textField.textRange(from: newPosition, to: newPosition)
}
return false
}
return true
}
Swift 5（具有确保最后一个char动画的完整版本）
private struct Constants {
static let SecuringLastCharPasswordDelay = 1.5
}
@IBOutlet weak var passwordTextField: UITextField!
private var secureTextAnimationQueue: [String] = []
var maskedPasswordChar: String = "●"
var passwordText: String = ""
var isSecureTextEntry: Bool = true {
didSet {
secureTextAnimationQueue.removeAll()
let selectedTextRange = passwordTextField.selectedTextRange
passwordTextField.text = isSecureTextEntry ? String(repeating: maskedPasswordChar, count: passwordText.count) : passwordText
passwordTextField.selectedTextRange = selectedTextRange
}
}
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
if textField == passwordTextField {
if let swiftRange = Range(range, in: passwordText) {
passwordText = passwordText.replacingCharacters(in: swiftRange, with: string)
} else {
passwordText = string
}
updateTextFieldString(textField, shouldChangeCharactersIn: range, replacementString: string)
if let newPosition = textField.position(from: textField.beginningOfDocument, offset: range.location + string.utf16.count) {
textField.selectedTextRange = textField.textRange(from: newPosition, to: newPosition)
}
return false
}
return true
}
private func updateTextFieldString(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) {
if isSecureTextEntry {
if string.count == .one, let text = textField.text {
let maskedText = String(repeating: maskedPasswordChar, count: text.count)
var newMaskedText = String()
if let swiftRange = Range(range, in: maskedText) {
newMaskedText = maskedText.replacingCharacters(in: swiftRange, with: string)
} else {
newMaskedText = text + maskedText
}
textField.text = newMaskedText
secureTextAnimationQueue.append(string)
asyncWorker.asyncAfter(deadline: .now() + Constants.SecuringLastCharPasswordDelay) { [weak self] in
self?.securingLastPasswordChar()
}
} else {
secureTextAnimationQueue.removeAll()
textField.text = String(repeating: maskedPasswordChar, count: passwordText.count)
}
} else {
textField.text = passwordText
}
}
private func securingLastPasswordChar() {
guard secureTextAnimationQueue.count > .zero, isSecureTextEntry else { return }
secureTextAnimationQueue.removeFirst()
if secureTextAnimationQueue.count == .zero {
let selectedTextRange = passwordTextField.selectedTextRange
passwordTextField.text = String(repeating: maskedPasswordChar, count: passwordText.count)
passwordTextField.selectedTextRange = selectedTextRange
}
}
textContentType属性设置为.textContentType--这应该告诉iOS 11您的字段不是用户名/密码字段（即使它们是），并阻止显示附件视图；诸如“ self.passwordField.textContentType = .textContentType`之类的东西