我可以在不增加行高的情况下调整 NSAttributedString 中的基线吗? [英] Can I adjust the baseline in an NSAttributedString without increasing the line height?

问题描述

在 San Francisco 字体中，如果括号围绕数字，则括号有点低.我正在制作的应用程序中的一个示例，使用 NSAttributedString:

In the San Francisco font, brackets are a bit low if they surround numbers. An example from the app I'm making, using an NSAttributedString:

我想将括号的基线增加一两个像素，但是当我使用 NSBaselineOffsetAttributeName 属性这样做时，行高也增加了两个像素.文本在 UITextView 内，我真的不希望行高改变.有什么我可以做的吗?

I'd like to increase the baseline for the brackets by a pixel or two, but when I do that using the NSBaselineOffsetAttributeName attribute, the line height is increased by two pixels as well. The text is inside a UITextView, and I really wouldn't like the line height to change. Is there anything I can do?

推荐答案

一种可能的方法是使用 NSParagraphAttributeName 强制最大行高.

A possible way to do it is to force the maximum line height with NSParagraphAttributeName.

NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc] init];
[style setMaximumLineHeight:maxHeightWanted];

NSDictionary *parenthesisAttributes = @{NSParagraphStyleAttributeName:style, 
                                        NSBaselineOffsetAttributeName:@(baselineWanted), 
                                        NSFontAttributeName:sameFontWithBiggerPointSize};

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