Question

我有一个带有滚动视图的UIViewController，一个以编程方式添加了字段的内容视图。文本视图已禁用滚动。当用户键入文本视图时，其大小会增加，但不会在键盘上方向上移动。此外，滚动没有滚动正确的视图。请检查附件中的project。

extension ScrollViewController: UITextViewDelegate {
    func textViewDidChange(_ textView: UITextView) {
        let fixedWidth = textView.frame.size.width
        var newSize = textView.sizeThatFits(CGSize(width: fixedWidth, height: CGFloat.greatestFiniteMagnitude))
        if newSize.height < 200 {
            newSize.height = 200
        }
        textView.frame.size = CGSize(width: max(newSize.width, fixedWidth), height: newSize.height)
        if let constraint = (body.constraints.filter { $0.firstAttribute == .height }.first) {
            constraint.constant = newSize.height
        }
        textView.layoutIfNeeded()
    }
}

约束代码：

func addConstraints() {
        // scroll view
        NSLayoutConstraint.activate([
            scrollView.topAnchor.constraint(equalTo: view.topAnchor, constant: 8.0),
            scrollView.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 8.0),
            scrollView.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -8.0),
            scrollView.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: -8.0)
            ])
        // content view
        NSLayoutConstraint.activate([
            contentView.topAnchor.constraint(equalTo: view.topAnchor),
            contentView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
            contentView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
            contentView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
            contentView.widthAnchor.constraint(equalTo: view.widthAnchor, multiplier: 1.0)
            ])
        // title text field
        NSLayoutConstraint.activate([
            titleText.topAnchor.constraint(equalTo: contentView.topAnchor, constant: 100),
            titleText.leadingAnchor.constraint(equalTo: contentView.leadingAnchor, constant: 8.0),
            titleText.trailingAnchor.constraint(equalTo: contentView.trailingAnchor, constant: -8.0),
            titleText.bottomAnchor.constraint(equalTo: body.topAnchor, constant: -8.0),
            titleText.heightAnchor.constraint(equalToConstant: 31)
            ])
        // body text view
        NSLayoutConstraint.activate([
            body.topAnchor.constraint(equalTo: titleText.bottomAnchor, constant: 8.0),
            body.leadingAnchor.constraint(equalTo: contentView.leadingAnchor, constant: 8.0),
            body.trailingAnchor.constraint(equalTo: contentView.trailingAnchor, constant: -8.0),
            body.bottomAnchor.constraint(equalTo: contentView.bottomAnchor, constant: -40),
            body.heightAnchor.constraint(equalToConstant: 200)
        ])
    }

Answer 1

请使用以下代码

GrowingTextView

根据您的要求，textview是不够的。如果您发现任何问题，请尝试让我知道。

Answer 2

*tmp*

使用此代码，您的问题将得到解决。代码的主要问题是锚定 contentView ，并且您将标题文本字段bottomAnchor赋予body.topAnchor，这会导致您的正文文本视图高度。

我正在尝试以编程方式创建UI，但是滚动视图和文本视图无法正常工作

2 个答案: