ios - 垂直对齐 NSMutableAttributedString 中的 NSTextAttachment

Question

我在 NSMutableAttributedString 中使用 NSTextAttachment 向 UILabel 添加一个图标，如下所示:

//Setting up icon
let moneyIcon = NSTextAttachment()
moneyIcon.image = UIImage(named: "MoneyIcon")
let moneyIconString = NSAttributedString(attachment: moneyIcon)

//Setting up text
let balanceString = NSMutableAttributedString(string: " 1,702,200")
balanceString.insert(moneyIconString, at: 0)

//Adding string to label
self.attributedText = balanceString
self.sizeToFit()

但由于某些原因图标没有垂直对齐

有谁知道我该如何对齐它？

谢谢!

Answer 1

使用 NSTextAttachment 的 bounds 属性。

//Setting up icon
let moneyIcon = NSTextAttachment()
moneyIcon.image = UIImage(named: "MoneyIcon")

let imageSize = moneyIcon.image!.size
moneyIcon.bounds = CGRect(x: CGFloat(0), y: (font.capHeight - imageSize.height) / 2, width: imageSize.width, height: imageSize.height)

let moneyIconString = NSAttributedString(attachment: moneyIcon)

//Setting up text
let balanceString = NSMutableAttributedString(string: " 1,702,200")
balanceString.insert(moneyIconString, at: 0)

//Adding string to label
self.attributedText = balanceString
self.sizeToFit()