我正在使用SkyFloatingLabeltextField作为textfield。我想检查所有文本字段是否有效然后我想调用下一个viewController.So请告诉我如何检查
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {}是真还是不？ 以下是我的代码
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
if let text = username.text {
let message = Comman.matches(for: "[a-zA-Z]+[0-9a-zA-Z._%+-]+[a-zA-Z0-9]+@[a-zA-Z0-9-]+\\.[a-zA-Z]{1,6}", in: text)
print(message.count);
print(message)
if let floatingLabelTextField = username as? SkyFloatingLabelTextField {
if(message.count != 1) {
floatingLabelTextField.errorMessage = "Please enter valid email id"
}
else {
// The error message will only disappear when we reset it to nil or empty string
floatingLabelTextField.errorMessage = ""
}
}
}
if let text = password.text {
let message = Comman.matches(for: "^(?=.*[a-z])(?=.*[A-Z])(?=.*[!@#$%^&])(?=.*\\d).{8,16}$", in: text)
if let floatingLabelTextField = password as? SkyFloatingLabelTextField {
if(message.count != 1) {
floatingLabelTextField.errorMessage = "Please enter valid Password"
}
else {
// The error message will only disappear when we reset it to nil or empty string
floatingLabelTextField.errorMessage = ""
}
}
}
if let text = firstName.text {
let characterset = CharacterSet(charactersIn: "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLKMNOPQRSTUVWXYZ0123456789")
if let floatingLabelTextField = firstName as? SkyFloatingLabelTextField {
if text.rangeOfCharacter(from: characterset.inverted) != nil {
floatingLabelTextField.errorMessage = "Please enter valid Name"
}
else {
// The error message will only disappear when we reset it to nil or empty string
floatingLabelTextField.errorMessage = ""
}
}
}
if let text = lastName.text {
let characterset = CharacterSet(charactersIn: "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLKMNOPQRSTUVWXYZ0123456789")
if let floatingLabelTextField = lastName as? SkyFloatingLabelTextField {
if text.rangeOfCharacter(from: characterset.inverted) != nil {
floatingLabelTextField.errorMessage = "Please enter valid Name"
}
else {
// The error message will only disappear when we reset it to nil or empty string
floatingLabelTextField.errorMessage = ""
}
}
}
if let text = mobileNumber.text {
let characterset = CharacterSet(charactersIn: "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLKMNOPQRSTUVWXYZ0123456789")
if let floatingLabelTextField = mobileNumber as? SkyFloatingLabelTextField {
if text.rangeOfCharacter(from: characterset.inverted) != nil {
floatingLabelTextField.errorMessage = "Please enter valid Mobile number"
}
else {
// The error message will only disappear when we reset it to nil or empty string
floatingLabelTextField.errorMessage = ""
}
}
}
return true
}
和我的按钮一样
@IBAction func signUpButtonPressed(_ sender: Any) { if username.text == "" {
if let floatingLabelTextField = username as? SkyFloatingLabelTextField {
floatingLabelTextField.errorMessage = "Please enter UserName"
}
}
if password.text == "" {
if let floatingLabelTextField = password as? SkyFloatingLabelTextField {
floatingLabelTextField.errorMessage = "Please enter Password"
}
}
if firstName.text == "" {
if let floatingLabelTextField = firstName as? SkyFloatingLabelTextField {
floatingLabelTextField.errorMessage = "Please enter First Name"
}
}
if lastName.text == "" {
if let floatingLabelTextField = lastName as? SkyFloatingLabelTextField {
floatingLabelTextField.errorMessage = "Please enter Last Name"
}
}
if mobileNumber.text == "" {
if let floatingLabelTextField = mobileNumber as? SkyFloatingLabelTextField {
floatingLabelTextField.errorMessage = "Please enter Mobile Number"
}
}
}
那么当它有效时如何处理????
答案 0 :(得分：4)
在这种情况下，您需要实现UITextfield的委托：
如果要检查每个字符输入并希望控制文本输入，请使用以下方法：
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
if textField == newPasswordTextField {
let newString = NSString(string: textField.text!).replacingCharacters(in: range, with: string)
let existOrNotNumber = checkTextNumber(text: newString)
let existOrNotSpecialCharacter = checkSpecialCharacter(text: newString)
let existOrNotCapitalCharacter = CapitalLetter(text: newString)
let existOrNotlwerCharacter = lowerCaseLetter(text: newString)
let usernameSameOrNot = checkUserName(text: newString )
textField.text = newString;
if existOrNotNumber {
numericDigitLabel.textColor = kGreenColor
}else{
numericDigitLabel.textColor = UIColor.red
}
if existOrNotSpecialCharacter {
specialCharacterLabel.textColor = kGreenColor
}else{
specialCharacterLabel.textColor = UIColor.red
}
if existOrNotCapitalCharacter{
uppercaseCharacterLabel.textColor = kGreenColor
}else{
uppercaseCharacterLabel.textColor = UIColor.red
}
if existOrNotlwerCharacter{
lowercaseCharacterLabel.textColor = kGreenColor
}else{
lowercaseCharacterLabel.textColor = UIColor.red
}
if (newString.characters.count) >= 8 && (newString.characters.count) <= 50 {
minimumEightCharacterLabel.textColor = kGreenColor
}else{
minimumEightCharacterLabel.textColor = UIColor.red
}
if usernameSameOrNot{
userNameCannotBePasslabel.textColor = kGreenColor
}else{
userNameCannotBePasslabel.textColor = UIColor.red
}
return false
}
return true
}
您可以在此检查每个文字验证。为了验证我创建了这个通用函数来验证。
// MARK: - Validation for Textfield
func isValidAllFields() -> Bool {
var isValid = true
var errorMessage : String = ""
let showAndReturn : () -> Bool = { Void -> Bool in
AppUtility.showAlert(message: errorMessage, isSuccess: false)
return isValid
}
let showAndReturnWithoutToast : () -> Bool = { Void -> Bool in
return isValid
}
if (oldPasswordTextField.text ?? "").isEmpty || (oldPasswordTextField.text?.trimmingCharacters(in: .whitespaces).characters.count)! == 0 {
isValid = false
errorMessage = kOldPasswordEmptyMessage
return showAndReturn()
}
if (newPasswordTextField.text ?? "").isEmpty || (newPasswordTextField.text?.trimmingCharacters(in: .whitespaces).characters.count)! == 0 {
isValid = false
errorMessage = kNewPasswordEmptyMessage
return showAndReturn()
}
if (confirmPasswordTextField.text ?? "").isEmpty || (confirmPasswordTextField.text?.trimmingCharacters(in: .whitespaces).characters.count)! == 0 {
isValid = false
errorMessage = kConfirmPasswordEmptyMessage
return showAndReturn()
}
if oldPasswordTextField.text != UserDefaults.standard.object(forKey: kOldPassword) as? String {
isValid = false
errorMessage = kCorrectOldPasswordMessage
return showAndReturn()
}
if (newPasswordTextField.text?.characters.count)! < 8 || (newPasswordTextField.text?.characters.count)! > 50 {
isValid = false
return showAndReturnWithoutToast()
// errorMessage = "New password should not be less than 8 characters and more than 50 characters"
}
if !checkTextNumber(text: newPasswordTextField.text!) {
isValid = false
return showAndReturnWithoutToast()
// errorMessage = "New password must contain at least 1 Numeric digit"
}
if !checkSpecialCharacter(text: newPasswordTextField.text!) {
isValid = false
return showAndReturnWithoutToast()
// errorMessage = "New password must contain at least 1 special character"
}
if !CapitalLetter(text: newPasswordTextField.text!) {
isValid = false
return showAndReturnWithoutToast()
//errorMessage = "New password must contain at least 1 Upper case character"
}
if !lowerCaseLetter(text: newPasswordTextField.text!) {
isValid = false
return showAndReturnWithoutToast()
// errorMessage = "New password must contain at least 1 Lower case character"
}
if !checkUserName(text: newPasswordTextField.text!) {
isValid = false
return showAndReturnWithoutToast()
}
if confirmPasswordTextField.text != newPasswordTextField.text{
isValid = false
errorMessage = kNewPassAndCofirmSameMessage
return showAndReturn()
}
return isValid
}
on Button单击只检查isValid（），如果返回true则允许它传递给下一个视图控制器
答案 1 :(得分：0)
如果要在键入时执行检查，可以使用委托方法执行检查：
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
let text = NSString(string: textField.text!).replacingCharacters(in: range, with: string)
// Perform validation of the `text`
if valid {
return true
} else {
return false
}
}
或者，如果您想在填写完所有字段后执行检查，您只需按textField.text检查文字。