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How would I set the Line Height or Line Spacing in an NSTextView (i.e. how tall each line is, or how much space is between each line)?
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Line height, also known as leading, is the distance between each line when you have two or more rows of text. Letter spacing, also known as tracking, is the size of the gaps between each letter of each word.
For most text, the optimal line spacing is between 120% and 145% of the point size. Most word processors, as well as CSS, let you define line spacing as a multiple. Or you can do the math—multiply your point size by the percentage.
Line spacing should be at least a space-and-a-half within paragraphs. So around 150 percent or 1.5 times the font size. Spacing following paragraphs should be at least two times the font size.
leave the answer in case someone need:
NSMutableParagraphStyle * myStyle = [[NSMutableParagraphStyle alloc] init];
[myStyle setLineSpacing:10.0];
[myTextView setDefaultParagraphStyle:myStyle];
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