在文本视图中同时使用Swift常规和粗体字体

let attributedString = NSMutableAttributedString(string: "Hello World!")

// 设置常规字体
let regularFont = UIFont.systemFont(ofSize: 16)
let regularAttributes: [NSAttributedString.Key: Any] = [NSAttributedString.Key.font: regularFont]
attributedString.addAttributes(regularAttributes, range: NSRange(location: 0, length: attributedString.length))

// 设置粗体字体
let boldFont = UIFont.boldSystemFont(ofSize: 16)
let boldAttributes: [NSAttributedString.Key: Any] = [NSAttributedString.Key.font: boldFont]
attributedString.addAttributes(boldAttributes, range: NSRange(location: 6, length: 5)) // 将"World"设置为粗体

// 将attributedString应用到文本视图
textView.attributedText = attributedString