Sets how sample values are composited by a graphics context.
- iOS 2.0+
- macOS 10.4+
- Mac Catalyst 13.0+Beta
- tvOS 9.0+
- watchOS 2.0+
A blend mode. See
CGBlendMode for a list of the constants you can supply.
Managing a Graphics Context
Forces all pending drawing operations in a window context to be rendered immediately to the destination device.
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