当文本在Swift中进入键盘级别时，如何在文本视图中实现自动滚动？

Question

我知道当内容（文本）超过文本视图的默认高度时会自动滚动，但我希望文本视图为全屏，当内容进入键盘级别时，文本视图应自动滚动。 我给了一个GIF来帮助读者更好地理解。

关于IOS的说明

class StartStoryPopUp: UIViewController, UITextViewDelegate {
    // Setup text view
    func setupTextView() {

        textViewOne.textColor = .black
        textViewOne.backgroundColor = baseColor
        // Add some padding to the text insde the text view
        textViewOne.textContainerInset = UIEdgeInsets(top: 15, left: 10, bottom: 15, right: 10)
        textViewOne.font = UIFont(name: "PatrickHand-Regular", size: 25)
        textViewOne.layer.cornerRadius = 25

        popUp.addSubview(textViewOne)
        addTextViewConstraints()
    }

    // Add the constraints to the 'start story' text view
    func addTextViewConstraints() {

        textViewOne.translatesAutoresizingMaskIntoConstraints = false
        textViewOne.leadingAnchor.constraint(equalTo: popUp.leadingAnchor, constant: 3).isActive = true
        textViewOne.trailingAnchor.constraint(equalTo: popUp.trailingAnchor, constant: -3).isActive = true
        textViewOne.topAnchor.constraint(equalTo: popUp.topAnchor, constant: 3).isActive = true
        textViewOne.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: -30).isActive = true
    }
}

Answer 1

斯威夫特5

也许这条线对你有用。

你应该在textViewDidChange函数中使用这样的动画设置contentOffSet ：

func textViewDidChange(_ textView: UITextView) {

    let line = textView.caretRect(for: (textView.selectedTextRange?.start)!)
    let overFlow = line.origin.y + line.size.height - (textView.contentOffset.y + textView.bounds.size.height - textView.contentInset.bottom - textView.contentInset.top)

    if 0 < overFlow {

        var offSet = textView.contentOffset
        offSet.y += (overFlow + 7)

        UIView.animate(withDuration: 0.3, animations: {
            textView.setContentOffset(offSet, animated: true)
        })
    }
}