在 Swift 中附加归属字符串和粗体文本

let someValue : String = "Something the user entered"     
let text = NSMutableAttributedString(string: "The value is: ")
text.appendAttributedString(NSAttributedString(string: someValue, attributes: [NSFontAttributeName:UIFont.boldSystemFontOfSize(UIFont.systemFontSize())]))

结果如下:

值为: 用户输入的内容