UITextView分配在更新时更改

Question

更新UITextView时，我试图使文本与中心对齐，但出于某种原因，除中心对齐外，所有其他设置都保存。

这里是我初始化文本视图的位置

  private let displayTextView: UITextView = {
    let textView = UITextView()
    let attributedText = NSMutableAttributedString(string: "Str", attributes: [NSAttributedString.Key.font: UIFont.fableFont(36, weight: .semibold)])
    attributedText.append(NSAttributedString(string: "\n\nStr", attributes: [NSAttributedString.Key.font: UIFont.fableFont(18, weight: .medium), NSAttributedString.Key.foregroundColor: UIColor.black]))
    textView.attributedText = attributedText
    textView.textAlignment = .center
    textView.isEditable = false
    textView.isScrollEnabled = false
    textView.isSelectable = false
    textView.translatesAutoresizingMaskIntoConstraints = false
    return textView
  }()

这里是我更新文本视图的位置

  private func getDisplayText(pageNumber: Int) -> NSAttributedString {
    switch tapCount {
    case 0:
      let attributedText = NSMutableAttributedString(string: "Create", attributes: [NSAttributedString.Key.font: UIFont.fableFont(36, weight: .semibold)])
      attributedText.append(NSAttributedString(string: "\n\nStr", attributes: [NSAttributedString.Key.font: UIFont.fableFont(18, weight: .medium), NSAttributedString.Key.foregroundColor: UIColor.black]))
      return attributedText
    case 1:
      let attributedText = NSMutableAttributedString(string: "Str", attributes: [NSAttributedString.Key.font: UIFont.fableFont(36, weight: .semibold)])
      attributedText.append(NSAttributedString(string: "\n\nStr", attributes: [NSAttributedString.Key.font: UIFont.fableFont(18, weight: .medium), NSAttributedString.Key.foregroundColor: UIColor.black]))
      return attributedText
    case 2:
      let attributedText = NSMutableAttributedString(string: "Str", attributes: [NSAttributedString.Key.font: UIFont.fableFont(36, weight: .semibold)])
      attributedText.append(NSAttributedString(string: "\n\nStr", attributes: [NSAttributedString.Key.font: UIFont.fableFont(18, weight: .medium), NSAttributedString.Key.foregroundColor: UIColor.black]))
      return attributedText
    default:
      let attributedText = NSMutableAttributedString(string: "Str", attributes: [NSAttributedString.Key.font: UIFont.fableFont(36, weight: .semibold)])
      attributedText.append(NSAttributedString(string: "\n\nStr", attributes: [NSAttributedString.Key.font: UIFont.fableFont(18, weight: .medium), NSAttributedString.Key.foregroundColor: UIColor.black]))
      return attributedText
    }
  }

Answer 1

附加attributedText对齐方式

private func getDisplayText(pageNumber: Int) -> NSAttributedString {

        // Define paragraph style - you got to pass it along to NSAttributedString constructor
        let paragraphStyle = NSMutableParagraphStyle()
        paragraphStyle.alignment = .center

      switch pageNumber {
      case 0:
        let attributedText = NSMutableAttributedString(string: "Create", attributes: [NSAttributedString.Key.font: UIFont.fableFont(36, weight: .semibold)])
      attributedText.append(NSAttributedString(string: "\n\nStr", attributes: [NSAttributedString.Key.font: UIFont.fableFont(18, weight: .medium), NSAttributedString.Key.foregroundColor: UIColor.black, , NSAttributedString.Key.paragraphStyle: paragraphStyle]))
      return attributedText
      case 1:
        let attributedText = NSMutableAttributedString(string: "Str", attributes: [NSAttributedString.Key.font: UIFont.fableFont(36, weight: .semibold)])
        attributedText.append(NSAttributedString(string: "\n\nStr", attributes: [NSAttributedString.Key.font: UIFont.fableFont(18, weight: .medium), NSAttributedString.Key.foregroundColor: UIColor.black, , NSAttributedString.Key.paragraphStyle: paragraphStyle]))
        return attributedText
      case 2:
        let attributedText = NSMutableAttributedString(string: "Str", attributes: [NSAttributedString.Key.font: UIFont.fableFont(36, weight: .semibold)])
        attributedText.append(NSAttributedString(string: "\n\nStr", attributes: [NSAttributedString.Key.font: UIFont.fableFont(18, weight: .medium), NSAttributedString.Key.foregroundColor: UIColor.black, , NSAttributedString.Key.paragraphStyle: paragraphStyle]))
        return attributedText
      default:
        let attributedText = NSMutableAttributedString(string: "Str", attributes: [NSAttributedString.Key.font: UIFont.fableFont(36, weight: .semibold)])
        attributedText.append(NSAttributedString(string: "\n\nStr", attributes: [NSAttributedString.Key.font: UIFont.fableFont(18, weight: .medium), NSAttributedString.Key.foregroundColor: UIColor.black, , NSAttributedString.Key.paragraphStyle: paragraphStyle]))
        return attributedText
      }
    }