当文本包含线路断开和标签的台词和LINEBREACKMODE时，Uilabel在最后一行中显示不正确的文本。ByTruncatingTail

Question

如果在下面运行代码段，它将在最后一行中显示不正确的文本，该文本具有...省略号，如该图像所示：

一旦将linebreakmode更改为bywordwrapprapped < /code>，或将numberOflines设置为0，然后正确显示文本。另外，如果您从文本中删除demake /n，则文本将正确显示。

因此，我的问题是：如何在Uilabel的文本中使用A /N线路断开，并使用有限的数字线和LineBreakMode .BytruncatingTail而又不会在最后一行显示不正确的文本？

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        
        let text = "A line break challenge \nInvestigating a bug where the text in the last line is incorrect when numberOfLines is limited to for example 3. Very strange indeed. Peculiar. What to do about this? What am I missing?"
        
        let paragraphStyle = NSMutableParagraphStyle()
        paragraphStyle.lineBreakMode = .byTruncatingTail //.byWordWrapping works, but not what I want.

        let attributedString = NSAttributedString(string: text, attributes: [
            .paragraphStyle: paragraphStyle
        ])
        
        let label = UILabel()
        label.attributedText = attributedString
        label.numberOfLines = 3 //0 works, but is not what I want.

        label.translatesAutoresizingMaskIntoConstraints = false
        view.addSubview(label)
        
        label.topAnchor.constraint(equalTo: view.topAnchor, constant: 40.0).isActive = true
        label.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 20.0).isActive = true
        label.rightAnchor.constraint(equalTo: view.rightAnchor, constant: -20.0).isActive = true
    }
}