问题描述
我想在一个文本块中标注所有®字符的实例（法律免责声明，当然;）），默认方式 NSAttributedString 不是很好。
I want to superscript all the instances of ® character in a block of text (legal disclaimer, naturally ;)) and the default way NSAttributedString is not very good.
如果我只是让角色成为并且只使用未经修改的 NSString ，它将呈现与大写字母相同的大小并且大致位于基线处。如果我将superscript属性添加到 NSAttributedString ，如下所示：
If I just let the character be and only use unmodified NSString, it is rendered the same size as a capital letter and is placed approximately at the baseline. If I add the superscript attribute to NSAttributedString as follows:
[attrStr setAttributes:@{(NSString *)kCTSuperscriptAttributeName : @1} range:NSMakeRange(locationOfReg, 1)];
该字符从基线上抬起，其大小不变，但线间距现在受到影响，因为否则凸起的角色会侵入上面的那一行。
The character is lifted off the baseline, its size is unchanged, but the line spacing is now affected because the raised character would otherwise intrude on the line above.
举例说明：
我在Photoshop中创建了这个图像，通过减小角色的大小和移动来实现所需的位置基线。我知道如何在iOS中更改字体大小，但更改基线似乎更棘手。关于如何实现这一点的任何建议？
I created this image in Photoshop where the desired position was achieved by reducing the size of the character and shifting the baseline. I know how to change the font size in iOS, but changing the baseline seems trickier. Any suggestions on how to achieve this?
编辑：我想我可以使用上标属性作为一种方法来改变基线。现在最好找出一种获取当前字体大小的方法，然后减少它以允许在不同大小的文本块上使用相同的方法。
I suppose I could use the superscript attribute as a way to shift the baseline up. Now it would be great to figure out a way to get the current font size and subsequently reduce it to allow the same method to be used on blocks of text of different size.
推荐答案
以下代码似乎可以解决问题：
The following code seems to do the trick:
UIFont *fnt = [UIFont fontWithName:@"Helvetica" size:20.0];
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:@"GGG®GGG"
attributes:@{NSFontAttributeName: [fnt fontWithSize:20]}];
[attributedString setAttributes:@{NSFontAttributeName : [fnt fontWithSize:10]
, NSBaselineOffsetAttributeName : @10} range:NSMakeRange(3, 1)];
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