Draws a frame around the inside of a rectangle using the specified blend mode.
- iOS 2.0+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
The rectangle defining the area in which to draw.
The blend mode to use during drawing.
This function draws a frame around the inside of rect in the fill color of the current graphics context and using the specified blend mode. The width is equal to 1.0 in the current coordinate system. Since the frame is drawn inside the rectangle, it is visible even if drawing is clipped to the rectangle. If the current graphics context is
nil, this function does nothing.
Because this function does not draw directly on the line, but rather inside it, it uses the current fill color (not stroke color) when drawing.
This function may be called from any thread of your app.