如何在Swift中使用下标和上标? [英] How do I use subscript and superscript in Swift?

问题描述

我希望我的UILabel以以下方式显示文本6.022 * 10 ²³ . Swift对下标和上标有什么功能?

I want my UILabel to display text in following manner 6.022*10²³. What functions does Swift have for subscript and superscript?

推荐答案

大多数答案和示例都在ObjC中，但这是在Swift中的方法.

Most of the answers+examples are in ObjC, but this is how to do it in Swift.

let font:UIFont? = UIFont(name: "Helvetica", size:20)
let fontSuper:UIFont? = UIFont(name: "Helvetica", size:10)
let attString:NSMutableAttributedString = NSMutableAttributedString(string: "6.022*1023", attributes: [.font:font!])
attString.setAttributes([.font:fontSuper!,.baselineOffset:10], range: NSRange(location:8,length:2))
labelVarName.attributedText = attString

这给了我:

更详细的说明:

1. 获取默认样式和上标样式所需的UIFont，上标必须较小.
2. 使用完整的字符串和默认字体创建一个NSMutableAttributedString.
3. 在要更改的字符(NSRange)上添加属性，并使用较小的/下标UIFont，并且NSBaselineOffsetAttributeName值是您想要垂直偏移它的数量.
4. 将其分配给您的UILabel

1. Get UIFont you want for both the default and superscript style, superscript must be smaller.
2. Create a NSMutableAttributedString with the full string and default font.
3. Add an attribute to the characters you want to change (NSRange), with the smaller/subscript UIFont, and the NSBaselineOffsetAttributeName value is the amount you want to offset it vertically.
4. Assign it to your UILabel

希望这对我需要的其他Swift开发人员也有帮助.

这篇关于如何在Swift中使用下标和上标?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！