Sets the stroke pattern in the specified graphics context.
- iOS 2.0+
- macOS 10.0+
- tvOS 9.0+
- watchOS 2.0+
- Core Graphics
A pattern for stroking. the object is retained; upon return, you may safely release it.
If the specified pattern is an uncolored (or masking) pattern, pass an array of intensity values that specify the color to use when the pattern is painted. The number of array elements must equal the number of components in the base space of the stroke pattern color space, plus an additional component for the alpha value.
If the specified pattern is a colored pattern, pass an alpha value.
The current stroke color space must be a pattern color space. Otherwise, the result of calling this function is undefined. If you want to set a stroke color, not a stroke pattern, use