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並前往https://newbedev.com/swift-on-os-x-how-to-access-the-current-cgcontext-for-drawing-in-nsview-drawrect

How to access the current CGContext for drawing in - Newbedev

Example Swift 3+ class CustomView: NSView { private var currentContext : CGContext? { get { if #available(OSX 10.10, *) { return NSGraphicsContext.current?

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