UIGraphicsPushContext

UIGraphicsPushContext is a function in the UIKit framework of Apple's operating systems, primarily used within macOS and iOS development. It is employed when you need to draw into a graphics context that is not the current one. The function takes a `CGContextRef` as an argument, which is a reference to the graphics context you want to make active. When you call UIGraphicsPushContext, the existing graphics context is saved onto a stack, and the provided `CGContextRef` becomes the new current context.

This is particularly useful when you are working with offscreen graphics contexts, such as those created for image generation or offscreen rendering. For example, if you create a `UIGraphicsImageRenderer` and obtain its context, you would use UIGraphicsPushContext to temporarily switch to that context before drawing into it. After you have finished your drawing operations within the pushed context, it is crucial to restore the original context. This is achieved by calling UIGraphicsPopContext(). Failing to pop the context can lead to unexpected drawing behavior or resource leaks. The stack mechanism ensures that contexts can be nested, allowing for complex drawing operations where multiple temporary contexts might be used.