Question

我正在尝试创建一个UITextView，该文本可编辑但不可滚动并且垂直对齐。那是我现在的代码：

class MyTextView: UITextView {
    public var verticalAlignment: UIControl.ContentVerticalAlignment = .center {
        didSet {
            let topCorrection: CGFloat
            switch verticalAlignment {
            case .center:
                topCorrection = (bounds.size.height - contentSize.height * zoomScale) / 2.0
            case .bottom:
                topCorrection = (bounds.size.height - contentSize.height * zoomScale)
            case .top, .fill:
                topCorrection = 0
            @unknown default:
                topCorrection = 0
            }
            contentInset.top = max(0, topCorrection)
        }
    }
}

问题是它在禁用滚动功能时不起作用。您知道创建垂直对齐文本视图的其他方法吗？

PS：创建文本视图的代码：

let textView = MyTextView()
textView.backgroundColor = .clear
textView.attributedText = attributedString
textView.isUserInteractionEnabled = true
textView.isEditable = true
textView.allowsEditingTextAttributes = true
textView.isScrollEnabled = false
textView.textContainerInset = .zero
textView.verticalAlignment = .bottom
textView.sizeToFit()
self.addSubview(textView)

Answer 1

也许您打算使用UITextField？

let field = UITextField()
field.contentVerticalAlignment = UIControlContentVerticalAlignment.center

或将其设置为.bottom，.top等。

Answer 2

创建自定义textView

class CustomTextView: UITextView {
    override var canBecomeFirstResponder: Bool {
        return false
    }

    override var selectedTextRange: UITextRange? {
        get {
            return nil
        } set {

        }
    }

    override func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
        if let tapGestureRecognizer = gestureRecognizer as? UITapGestureRecognizer,
            tapGestureRecognizer.numberOfTapsRequired == 1 {
            return super.gestureRecognizerShouldBegin(gestureRecognizer)
        }

        if let longPressGestureRecognizer = gestureRecognizer as? UILongPressGestureRecognizer,

            longPressGestureRecognizer.minimumPressDuration < 0.325 {
            return super.gestureRecognizerShouldBegin(gestureRecognizer)
        }
        gestureRecognizer.isEnabled = false
        return false
    }
}

将此文本视图用作文本视图的基类

UITextView：可编辑文本视图上的垂直对齐

2 个答案: