How to Use NSGlyph in Swift
I couldn’t find a simple answer on the web at first, so here’s my take for Googlers.
When you need
NSGlyph (which is a
UInt32), you probably want to use
NSGlyphStorage.insertGlyphs(_:length:forStartingGlyphAt:characterIndex:) which in turn is implemented by
NSLayoutManager. But the useful glyph types to use like
Ints. How do you get a
NSGlyph-pointer from these?
Thankfully, in Swift you can satisfy
UnsafePointer<NSGlyph> in two useful ways:
Pass a reference to a mutable variable with the
let glyphIndex = ... let charIndex = ... var glyph = NSGlyph(NSControlGlyph) layoutManager.insertGlyphs(&glyph, length: 1, forStartingGlyphAt: glyphIndex, characterIndex: charIndex)
Pass an array of immutable values that is going to be kept alive for long enough, like:
let glyphIndex = ... let charIndex = ... layoutManager.insertGlyphs([NSGlyph(NSControlGlyph)], length: 1, forStartingGlyphAt: glyphIndex, characterIndex: charIndex)
Since the exemplary
insertGlyphs method call uses a plural-s, it’s pretty straightforward to use an array once you stop worrying about the question “where do I get a pointer from?”
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