我在StackView
内有一个ScrollView
,里面有几个TextFields
。当该特定文本字段开始编辑时,我想更改textField.height
之一。
我在textFieldShouldBeginEditing
内尝试过,但是XCode破坏了height.constraint
。
//delegate Methode für Password Textfield
func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool {
switch textField {
case passwordTextField:
eyeButtonOne.isHidden = false
passwordTextField.addSubview(checkLetterLabel)
checkLetterLabel.addSubview(checkLetterImage)
passwordTextField.addSubview(checkNumberLabel)
checkNumberLabel.addSubview(checkNumberImage)
passwordTextField.addSubview(checkLengthLabel)
checkLengthLabel.addSubview(checkLengthImage)
checkLetterLabel.topAnchor.constraint(equalTo: passwordTextField.bottomAnchor, constant: 5).isActive = true
checkLetterLabel.leadingAnchor.constraint(equalTo: checkLetterImage.leadingAnchor, constant: 13).isActive = true
checkLetterImage.leadingAnchor.constraint(equalTo: passwordTextField.leadingAnchor).isActive = true
checkLetterImage.centerYAnchor.constraint(equalTo: checkLetterLabel.centerYAnchor).isActive = true
checkLetterImage.heightAnchor.constraint(equalToConstant: 10).isActive = true
checkLetterImage.widthAnchor.constraint(equalToConstant: 10).isActive = true
checkNumberLabel.topAnchor.constraint(equalTo: checkLetterLabel.bottomAnchor, constant: 1).isActive = true
checkNumberLabel.leadingAnchor.constraint(equalTo: checkNumberImage.leadingAnchor, constant: 13).isActive = true
checkNumberImage.leadingAnchor.constraint(equalTo: passwordTextField.leadingAnchor).isActive = true
checkNumberImage.centerYAnchor.constraint(equalTo: checkNumberLabel.centerYAnchor).isActive = true
checkNumberImage.heightAnchor.constraint(equalToConstant: 10).isActive = true
checkNumberImage.widthAnchor.constraint(equalToConstant: 10).isActive = true
checkLengthLabel.topAnchor.constraint(equalTo: checkNumberLabel.bottomAnchor, constant: 1).isActive = true
checkLengthLabel.leadingAnchor.constraint(equalTo: checkLengthImage.leadingAnchor, constant: 13).isActive = true
checkLengthImage.leadingAnchor.constraint(equalTo: passwordTextField.leadingAnchor).isActive = true
checkLengthImage.centerYAnchor.constraint(equalTo: checkLengthLabel.centerYAnchor).isActive = true
checkLengthImage.heightAnchor.constraint(equalToConstant: 10).isActive = true
checkLengthImage.widthAnchor.constraint(equalToConstant: 10).isActive = true
passwordTextField.heightAnchor.constraint(equalToConstant: 140).isActive = true
theStackView.layoutIfNeeded()
break
case passwordWiederholenTextField:
eyeButtonTwo.isHidden = false
break
default:
break
}
return true
}
现在,当passwordTextField
beginsEditing
时,所有项目都将显示,但是高度没有变化...
如您所见,我也正在打电话给layoutIfNeeded()
,但是它什么也没做...我也想拥有某种动画,没什么特别的,最后看起来应该很流畅。
有人知道如何解决此问题吗?
答案 0 :(得分:1)
要打破高度,这意味着这条线还有1个高度限制
passwordTextField.heightAnchor.constraint(equalToConstant: 140).isActive = true
创建了另一个1,您需要添加一个变量
var heCon:NSLayoutConstraint!
heCon = passwordTextField.heightAnchor.constraint(equalToConstant: 140)
heCon.isActive = true
然后不断播放
heCon.constant = 100
theStackView.layoutIfNeeded()