Re: CoreText & NSMutableParagraphStyle maximumLineHeight
Re: CoreText & NSMutableParagraphStyle maximumLineHeight
- Subject: Re: CoreText & NSMutableParagraphStyle maximumLineHeight
- From: Peter C <email@hidden>
- Date: Tue, 20 Aug 2013 16:53:45 +0800
On 20 Aug, 2013, at 4:09 PM, Kyle Sluder <email@hidden> wrote:
> The default line height of Helvetica is 14.0. That information is
> encoded in the font. You can discover this for yourself by asking your
> NSLayoutManager for its defaultLineHeightForFont:. This line height will
> be used for text layout if the typesetter returns YES from
> -usesFontLeading.
>
> And of course, since 14 is less than 15, your maximumLineHeight is not
> reached and thus you won't see any effect for values greater than 14.
>
> --Kyle Sluder
That's it ! NSLayoutManager defaultLineHeightForFont works, thanks.
But only for NSFont. CTFontRef will the return same font size. I can live with that, get value from NSFont & NSLayoutManager before doing anything else.
I tested it, when the Helvetica font size is 12.0, the default line height is 14.0 . If when the Helvetica font size is 18.0, the default line height of is 22.0. Default line height is define by the font size.
-- Peter Chan
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