问题描述
我在 UIView 动画方面遇到了麻烦。当我点击其中一个 UITextField 时，基本上一切正常，直到我在选择另一个 UITextField 后选择另一个 UITextField 时，这些字段上下移动，然后在我选择另一个 UITextField 后返回到同一位置。
我做错了什么？我期望的是将包含我的字段的整个 UIStackView 向上移动以避免键盘覆盖它。此外，为了在我单击另一个 UITextField 时保持动画静态，只需在键盘关闭时返回默认位置即可。
class LoginViewController: UIViewController {
var coordinator: MainCoordinator?
override func viewDidLoad() {
super.viewDidLoad()
viewTapped()
setupScreen()
setupViews()
setConstraints()
}
private func setupScreen() {
self.view.backgroundColor = .systemPink
}
private func setConstraints() {
self.textFieldLogin.heightAnchor.constraint(equalToConstant: 50).isActive = true
self.textFieldLogin.widthAnchor.constraint(equalToConstant: 190).isActive = true
//
self.textFieldSenha.heightAnchor.constraint(equalToConstant: 50).isActive = true
self.textFieldSenha.widthAnchor.constraint(equalToConstant: 190).isActive = true
//
self.loginButton.widthAnchor.constraint(equalToConstant: 145).isActive = true
self.loginButton.heightAnchor.constraint(equalToConstant: 50).isActive = true
//
self.stackView.heightAnchor.constraint(equalToConstant: 200).isActive = true
self.stackView.widthAnchor.constraint(equalToConstant: 200).isActive = true
self.stackView.centerYAnchor.constraint(equalTo: self.view.centerYAnchor).isActive = true
self.stackView.centerXAnchor.constraint(equalTo: self.view.centerXAnchor).isActive = true
}
private func setupViews() {
self.view.addSubview(self.stackView)
self.viewTapped()
}
private lazy var textFieldLogin: UITextField = {
let textFieldLogin = UITextField()
textFieldLogin.tag = 1
textFieldLogin.translatesAutoresizingMaskIntoConstraints = false
textFieldLogin.layer.cornerRadius = 3.7
textFieldLogin.textAlignment = .center
textFieldLogin.placeholder = "Usuário"
textFieldLogin.backgroundColor = .white
textFieldLogin.delegate = self
return textFieldLogin
}()
private lazy var textFieldSenha: UITextField = {
let textFieldSenha = UITextField()
textFieldSenha.tag = 2
textFieldSenha.translatesAutoresizingMaskIntoConstraints = false
textFieldSenha.layer.cornerRadius = 3.7
textFieldSenha.textAlignment = .center
textFieldSenha.placeholder = "Senha"
textFieldSenha.backgroundColor = .white
textFieldSenha.delegate = self
return textFieldSenha
}()
private lazy var loginButton: UIButton = {
let loginButton = UIButton()
loginButton.translatesAutoresizingMaskIntoConstraints = false
loginButton.layer.cornerRadius = 3.8
loginButton.titleLabel?.font = UIFont(name: "Arial",size: 19)
loginButton.setTitle("Entrar",for: .normal)
loginButton.setTitleColor(.systemGreen,for: .normal)
loginButton.backgroundColor = .white
return loginButton
}()
private lazy var stackView: UIStackView = {
let stackView = UIStackView(arrangedSubviews: [self.textFieldLogin,self.textFieldSenha,self.loginButton])
stackView.translatesAutoresizingMaskIntoConstraints = false
stackView.backgroundColor = .systemBlue
stackView.axis = .vertical
stackView.distribution = .equalSpacing
return stackView
}()
private func viewTapped() {
let tapGesture = UITapGestureRecognizer(target: self,action: #selector(handleTap))
self.view.addGestureRecognizer(tapGesture)
}
@objc func handleTap(sender: UITapGestureRecognizer) {
UIView.animate(withDuration: 1.1,delay: 0,usingSpringWithDamping: 5.1,initialSpringVelocity: 5.0,options: .curveEaseIn,animations: {
self.stackView.frame.origin.y = self.stackView.frame.origin.y + 130
self.textFieldLogin.resignFirstResponder()
self.textFieldSenha.resignFirstResponder()
},completion: nil)
}
}
extension LoginViewController: UITextFieldDelegate {
func textFieldDidBeginEditing(_ textField: UITextField) {
UIView.animate(withDuration: 1.1,animations: {
self.stackView.frame.origin.y = self.stackView.frame.origin.y - 130
},completion: nil)
}
func textFieldDidEndEditing(_ textField: UITextField) {
UIView.animate(withDuration: 1.1,animations: {
self.stackView.frame.origin.y = self.stackView.frame.origin.y + 130
},completion: nil)
}
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
textField.resignFirstResponder()
return true
}
}
解决方法
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