之后更改 StackView 元素的高度
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【中文标题】之后更改 StackView 元素的高度【英文标题】:Change height of StackView element afterwards 【发布时间】:2020-03-02 21:54:32 【问题描述】:我在ScrollView
里面有一个StackView
,在里面我有几个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
内部尝试过,但 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passwordTextField
beginsEditing
时所有项目都在显示,但高度没有改变......
正如你所看到的,我也打电话给layoutIfNeeded()
,但这没有任何作用......我还想要某种动画,没什么特别的,它最终应该看起来很流畅。
有谁知道如何解决这个问题?
【问题讨论】:
【参考方案1】:为了打破高度,这意味着这条线还有另外 1 个高度限制
passwordTextField.heightAnchor.constraint(equalToConstant: 140).isActive = true
创建了另一个 1 ,你需要添加一个变量
var heCon:NSLayoutConstraint!
heCon = passwordTextField.heightAnchor.constraint(equalToConstant: 140)
heCon.isActive = true
然后玩它的常数
heCon.constant = 100
theStackView.layoutIfNeeded()
【讨论】:
我不能打电话给heCon.passwordTextField...
''NSLayoutConstraint' 类型的值没有成员'passwordTextField'以上是关于之后更改 StackView 元素的高度的主要内容,如果未能解决你的问题,请参考以下文章