如何使用核心文本在ios中不同UIlabel文本行设置不同字体样式

// 创建一个NSMutableAttributedString对象
let attributedString = NSMutableAttributedString(string: "Hello World!")

// 设置第一行文本的字体样式和大小
let firstLineRange = NSRange(location: 0, length: 5)
let firstLineAttributes: [NSAttributedString.Key: Any] = [
    .font: UIFont.boldSystemFont(ofSize: 16),
    .foregroundColor: UIColor.red
]
attributedString.addAttributes(firstLineAttributes, range: firstLineRange)

// 设置第二行文本的字体样式和大小
let secondLineRange = NSRange(location: 6, length: 6)
let secondLineAttributes: [NSAttributedString.Key: Any] = [
    .font: UIFont.italicSystemFont(ofSize: 14),
    .foregroundColor: UIColor.blue
]
attributedString.addAttributes(secondLineAttributes, range: secondLineRange)

// 创建一个UILabel对象，并将NSMutableAttributedString赋值给它的attributedText属性
let label = UILabel(frame: CGRect(x: 0, y: 0, width: 200, height: 100))
label.attributedText = attributedString