Ios 检查UITextfield是否处于活动状态
问题是,“眼睛按钮”只应在选择文本字段时显示。我用“isFirstResponder”试过,但似乎不起作用。你知道怎么处理吗?在下面的图片中,未选择文本字段 更新 委托函数“密码已更改”工作正常。我唯一需要的是,如果不再选择textfield,按钮应该隐藏。添加委托函数“beging”或“endEditing”不起作用。它只会导致另一个失败,如果用户键入内容,取消选择文本字段并再次选择它,文本将被删除Ios 检查UITextfield是否处于活动状态,ios,swift,uibutton,uitextfield,Ios,Swift,Uibutton,Uitextfield,问题是,“眼睛按钮”只应在选择文本字段时显示。我用“isFirstResponder”试过,但似乎不起作用。你知道怎么处理吗?在下面的图片中,未选择文本字段 更新 委托函数“密码已更改”工作正常。我唯一需要的是,如果不再选择textfield,按钮应该隐藏。添加委托函数“beging”或“endEditing”不起作用。它只会导致另一个失败,如果用户键入内容,取消选择文本字段并再次选择它,文本将被删除 @IBAction func passwordDidChange(_ sender: Any)
@IBAction func passwordDidChange(_ sender: Any) {
if self.passwordTextField.text == "" && self.passwordTextField.isFirstResponder != true{
self.eyeOpenButton.isHidden = true
}else {
self.eyeOpenButton.isHidden = false
}
你可以试试这样的东西
class ViewController: UIViewController, UITextFieldDelegate {
@IBOutlet weak var passwordTextField: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
self.eyeOpenButton.isHidden = true
passwordTextField.delegate = self
}
// calls when textfield becomes 1st responder
func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool {
switch textField {
case passwordTextField:
if passwordTextField.text != "" {
self.eyeOpenButton.isHidden = !self.eyeOpenButton.isHidden
} else {
self.eyeOpenButton.isHidden = !self.eyeOpenButton.isHidden
}
break
default:
break
}
return true
}
//Calls when the text fields resigns first responder
func textFieldShouldEndEditing(_ textField: UITextField) -> Bool {
if textField == passwordTextField {
if passwordTextField.text != "" {
self.eyeOpenButton.isHidden = !self.eyeOpenButton.isHidden
} else {
self.eyeOpenButton.isHidden = !self.eyeOpenButton.isHidden
}
}
return true
}
// Check all the input user has with the keyboard.
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
if let passwordTextField = passwordTextField {
if passwordTextField.text?.count ?? 0 > 0 {
self.eyeOpenButton.isHidden = !self.eyeOpenButton.isHidden
}
if passwordTextField.text?.count == 0 {
self.eyeOpenButton.isHidden = !self.eyeOpenButton.isHidden
}
}
return true
}
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
for textField in self.view.subviews where textField is UITextField {
textField.resignFirstResponder()
}
return true
}
}
你可以试试这样的
class ViewController: UIViewController, UITextFieldDelegate {
@IBOutlet weak var passwordTextField: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
self.eyeOpenButton.isHidden = true
passwordTextField.delegate = self
}
// calls when textfield becomes 1st responder
func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool {
switch textField {
case passwordTextField:
if passwordTextField.text != "" {
self.eyeOpenButton.isHidden = !self.eyeOpenButton.isHidden
} else {
self.eyeOpenButton.isHidden = !self.eyeOpenButton.isHidden
}
break
default:
break
}
return true
}
//Calls when the text fields resigns first responder
func textFieldShouldEndEditing(_ textField: UITextField) -> Bool {
if textField == passwordTextField {
if passwordTextField.text != "" {
self.eyeOpenButton.isHidden = !self.eyeOpenButton.isHidden
} else {
self.eyeOpenButton.isHidden = !self.eyeOpenButton.isHidden
}
}
return true
}
// Check all the input user has with the keyboard.
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
if let passwordTextField = passwordTextField {
if passwordTextField.text?.count ?? 0 > 0 {
self.eyeOpenButton.isHidden = !self.eyeOpenButton.isHidden
}
if passwordTextField.text?.count == 0 {
self.eyeOpenButton.isHidden = !self.eyeOpenButton.isHidden
}
}
return true
}
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
for textField in self.view.subviews where textField is UITextField {
textField.resignFirstResponder()
}
return true
}
}
您需要在
UITextfieldDelegate
方法中处理此问题。实施这些方法,听取更改并相应地采取行动。您需要在UITextfieldDelegate
方法中处理此问题。执行这些方法,听取更改并相应地采取行动。您可能想要更改它,并在textfieldDiBeginediting
delegate Method中检查它。如何将按钮指定为textField的rightView
,并在编辑时将其rightViewMode
设置为,但其中只有一个按钮以某种方式显示出来。“vergessen”按钮或“eye”按钮。您可能需要更改它并在textfieldDiBeginediting
delegate方法中检查它。将按钮指定为文本字段的rightView
,并在编辑时将其rightViewMode
设置为如何?之前尝试过,但其中只有一个按钮以某种方式显示出来。“vergessen”按钮或“eye”按钮。我已经尝试过了,但是如果我输入了一些东西,并且在AppDelegate类中得到了这个错误,应用程序就会崩溃:线程1:signal SIGABRTok我修复了这个错误。但你的解决方案并不适合这份工作。按钮仍然存在,但现在如果我结束编辑并再次开始编辑,文本字段中的文本将被删除:Dyou需要执行类似于self.eyeOpenButton.ishiden=!self.eyeOpenButton.ishiden
在哪里?在每个委托函数中?也不起作用。我尝试过这个方法,但是如果我输入了一些东西,并且在我的AppDelegate类中得到了这个错误,应用程序就会崩溃:线程1:signal SIGABRTok我修复了这个错误。但你的解决方案并不适合这份工作。按钮仍然存在,但现在如果我结束编辑并再次开始编辑,文本字段中的文本将被删除:Dyou需要执行类似于self.eyeOpenButton.ishiden=!self.eyeOpenButton.ishiden
在哪里?在每个委托函数中?也不起作用。