Function

CGColorGetAlpha

Returns the value of the alpha component associated with a color.

Declaration

CGFloat CGColorGetAlpha(CGColorRef color);

Parameters

color

A color.

Return Value

An alpha intensity value in the range [0,1]. The value represents the opacity of the color.

See Also

Getting Information about Core Graphics Colors

CGColorEqualToColor

Indicates whether two colors are equal.

CGColorGetColorSpace

Returns the color space associated with a color.

CGColorGetComponents

Returns the values of the color components (including alpha) associated with a color.

CGColorGetNumberOfComponents

Returns the number of color components (including alpha) associated with a color.

CGColorGetPattern

Returns the pattern associated with a color in a pattern color space.

CGColorGetTypeID

Returns the Core Foundation type identifier for a color data type.