在UITextView上替换属性化文本时保持自定义属性

// 原始文本
let originalText = "Hello, World!"

// 创建NSMutableAttributedString对象
let attributedText = NSMutableAttributedString(string: originalText)

// 设置自定义属性
let customAttributes: [NSAttributedString.Key: Any] = [
    .font: UIFont.boldSystemFont(ofSize: 16),
    .foregroundColor: UIColor.red
]
attributedText.setAttributes(customAttributes, range: NSRange(location: 0, length: attributedText.length))

// 要替换的文本和属性
let replacementText = "Swift"
let replacementAttributes: [NSAttributedString.Key: Any] = [
    .font: UIFont.italicSystemFont(ofSize: 16),
    .foregroundColor: UIColor.blue
]

// 替换文本
let range = (originalText as NSString).range(of: replacementText)
attributedText.replaceCharacters(in: range, with: NSAttributedString(string: replacementText, attributes: replacementAttributes))

// 将属性化文本设置给UITextView
textView.attributedText = attributedText