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CTRunDelegateGetAscentCallback

Defines a pointer to a function that determines typographic ascent of glyphs in the run.

Declaration

typealias CTRunDelegateGetAscentCallback = (UnsafeMutableRawPointer) -> CGFloat

Parameters

refCon:
The reference-constant value supplied to the Ctrundelegatecreate(_:_:) function when the run delegate was created.

Return Value

The typographic ascent of glyphs in the run associated with the run delegate.

Discussion

You would declare the get-ascent function like this if you were to name it MyGetAscentCallback:

See Also

Callbacks