Views alpha and frame property spoil when UITextFields first responder changes - ios

Question

I have a view (Lets called thirdStackView) and two textfield (Lets called them textfield b and c).
In my viewdidload, I give their anchors and make textfields alpha to 0, also y frame of textfields to -100. With a button tap, I move thirdstachview out of screen with an animation and make textfields visible and make their frame +100.
My problem is that when I change textfield, thirdstackview started to seen on screen and textfields positions move back to ones I gave in viewdidload. Also when I dismiss keyboard, this problem occurs.
I guess It is something about layoutIfneeded() but What can be the problem?
override func viewDidLoad() {
thirdStackView.anchor(self.btnStackView.bottomAnchor, left: self.view.leftAnchor, bottom: self.emergenyBtn.topAnchor, right: self.view.rightAnchor, topConstant: 20, leftConstant: 20, bottomConstant: 13, rightConstant: 20, widthConstant: 0, heightConstant: 0)
self.createTextField(placeHolderText: getLabelText(key: CMSKeys.CMS_TF_TCKNID), titleText: getLabelText(key: CMSKeys.CMS_TF_TCKNID), imageName: "id-icon",leftButtons: [.backDisabled,.forward], rightButtons: [.cancel],textField: idTextField)
idTextField.tag = 1
idTextField.keyboardType = UIKeyboardType.numberPad
idTextField.anchor(self.btnStackView.bottomAnchor, left: self.view.leftAnchor, bottom: nil, right: self.view.rightAnchor, topConstant: 20, leftConstant: 30, bottomConstant: 0, rightConstant: 30, widthConstant: 0, heightConstant: 40)
idTextField.alpha = 0
self.createTextField(placeHolderText: getLabelText(key: CMSKeys.CMS_TF_PHONE), titleText: getLabelText(key: CMSKeys.CMS_TF_PHONE), imageName: "phone-icon",leftButtons: [.back,.forward], rightButtons: [.cancel],textField: phoneTextField)
phoneTextField.keyboardType = UIKeyboardType.numberPad
phoneTextField.tag = 2
phoneTextField.anchor(idTextField.bottomAnchor, left: self.view.leftAnchor, bottom: nil, right: self.view.rightAnchor, topConstant: 20, leftConstant: 30, bottomConstant: 0, rightConstant: 30, widthConstant: 0, heightConstant: 40)
phoneTextField.alpha = 0
}
My animation function;
#objc func adminBtnTapped(_ button: UIButton) {
if(btnTapped){
UIView.transition(with: button, duration: 0.5, options: .transitionCrossDissolve, animations: {
self.emergenyBtn.frame.origin.y -= 20
}, completion: nil)
UIView.animate(withDuration: 1, animations: {
self.thirdStackView.frame.origin.y += self.view.bounds.height
self.bgView.frame.origin.y += self.view.bounds.height
self.backBtn.frame.origin.x += self.view.bounds.width
self.idTextField.frame.origin.y += 100
self.idTextField.alpha = 1.0
self.phoneTextField.frame.origin.y += 100
self.phoneTextField.alpha = 1.0
self.passTextField.frame.origin.y += 100
self.passTextField.alpha = 1.0
}) { (_) in
//self.emergenyBtn.setTitle("Giriş Yap", for: UIControlState.normal)
self.view.layoutIfNeeded()
}
btnTapped = false
}
}

Answer 1

When I make superviews "translatesAutoresizingMaskIntoConstraints" attribute to false, It solved. I think, when It is true, auto layout constraints messed up.
self.view.translatesAutoresizingMaskIntoConstraints = false
For gurus that this answer is not enough, you can check official Apple document
https://developer.apple.com/documentation/uikit/uiview/1622572-translatesautoresizingmaskintoco
From Apple Document
Note that the autoresizing mask constraints fully specify the view’s size and position; therefore, you cannot add additional constraints to modify this size or position without introducing conflicts.