Swift：使用setTitleTextAttributes为范围设置粗体

Question

如何创建如下按钮：

[数： 1]

其中Count：为粗体，1为纯文本。

let range = NSMakeRange(0,7)
let attrs = [NSFontAttributeName:UIFont.boldSystemFontOfSize(12)]
leftNameButton.setTitleTextAttributes(attrs, forState: UIControlState.Normal)
 // Where does range go?

Answer 1

如果您希望这可以在UIBarButtonItem上运行，您需要像这样使用customView：

let yourString = NSMutableAttributedString(string: "Count: 1")
yourString.setAttributes(attrs, range: range)
let buttonLabel = UILabel()
buttonLabel.attributedText = yourString
buttonLabel.sizeToFit() // Important for bar buttons
let barButton = UIBarButtonItem(customView: buttonLabel)

Answer 2

您需要使用NSMutableAttributedString

let yourString = NSMutableAttributedString(string: "[Count:1]",attributes: attrs!])

yourString.addAttribute(attrs!, range: range)

yourButton.text = yourString