如何在NSAttributedString中定义段落？

import UIKit

let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.lineSpacing = 4 // 设置行间距
paragraphStyle.alignment = .center // 设置文本对齐方式
paragraphStyle.firstLineHeadIndent = 10 // 设置首行缩进
paragraphStyle.headIndent = 10 // 设置段落首行缩进
paragraphStyle.tailIndent = -10 // 设置段落末行缩进

let attributedString = NSMutableAttributedString(string: "这是一个段落的文本内容，包含了多行文本。")
attributedString.addAttribute(.paragraphStyle, value: paragraphStyle, range: NSMakeRange(0, attributedString.length))

let label = UILabel(frame: CGRect(x: 0, y: 0, width: 200, height: 100))
label.attributedText = attributedString
label.numberOfLines = 0

// 将label添加到视图中