iOS 14 PickerView截断文本

Question

我有一个选取器视图，在iOS 14下不能正确显示文本。有人知道如何解决这个问题吗？似乎有一个覆盖文本的子视图？

​

​

是因为我使用了自定义标签吗？

func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) -> UIView {
        let pickerLabel = UILabel()
        let titleData = pickerDataSource[row]
        
        pickerView.subviews[1].backgroundColor = .clear
        pickerView.subviews[0].backgroundColor = .clear
        
        let myTitle = NSAttributedString(string: titleData, attributes: [NSAttributedString.Key.font:UIFont.systemFont(ofSize: 18),NSAttributedString.Key.foregroundColor:UIColor.black])
        pickerLabel.attributedText = myTitle
        return pickerLabel
    }

Answer 1

只需在标签上加上空白处--可以做到这一点。

After the fix

原始代码：

extension UILabel {
    func setMargins(margin: CGFloat = 10, _ leftMarginOnly: Bool = true) {
            if let textString = self.text {
                let paragraphStyle = NSMutableParagraphStyle()
                paragraphStyle.firstLineHeadIndent = margin
                paragraphStyle.headIndent = margin
                if !leftMarginOnly {
                    paragraphStyle.tailIndent = -margin
                }
                let attributedString = NSMutableAttributedString(string: textString)
                attributedString.addAttribute(.paragraphStyle, value: paragraphStyle, range: NSRange(location: 0, length: attributedString.length))
                attributedText = attributedString
            }
        }
}

Answer 2

您可以按照Nguyen的建议在ViewForRow方法中设置attributedString，并像这样编辑您的代码

 func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) -> UIView {
    let pickerLabel = UILabel()
    let titleData = pickerDataSource[row]
    
    pickerView.subviews[1].backgroundColor = .clear
    pickerView.subviews[0].backgroundColor = .clear
    
    let myTitle = NSAttributedString(string: titleData, attributes: [NSAttributedString.Key.font:UIFont.systemFont(ofSize: 18),NSAttributedString.Key.foregroundColor:UIColor.black])
    
    let margin : CGFloat = 12.0
    let paragraphStyle = NSMutableParagraphStyle()
    paragraphStyle.firstLineHeadIndent = margin
    paragraphStyle.headIndent = margin
    myTitle.addAttribute(.paragraphStyle, value: paragraphStyle, range: NSRange(location: 0, length: myTitle.length))
    
    pickerLabel.attributedText = myTitle
    return pickerLabel
}

Answer 3

我使用一种更简单的标签生成方法；现在我的变通方法是使用中心对齐，如下面的示例所示。

func pickerView(_ pickerView: UIPickerView,
                viewForRow row: Int,
                forComponent component: Int,
                reusing view: UIView?) -> UIView
{
    let pickerLabel = UILabel()
    pickerLabel.text = "Test string"
    pickerLabel.font = UIFont(name: "Ropa Sans", size: 18)
    pickerLabel.textColor = UIColor.white
    pickerLabel.textAlignment = NSTextAlignment.center
}

我想知道这是否是字体相关的缺陷，但由于您使用的是系统字体，我得出的结论是它可能不是。