Instance Property


A Boolean value indicating whether the view can draw its contents on a background thread.


@property BOOL canDrawConcurrently;


If your view’s drawRect: implementation can draw safely on a background thread, set this property to YES. Doing so gives AppKit the ability to run your view’s drawing code off the app’s main thread, which can improve performance. The view's window must also have its allowsConcurrentViewDrawing property set to YES (the default) for threaded view drawing to occur.

See Also


- updateLayer

Updates the view’s content by modifying its underlying layer.

- drawRect:

Overridden by subclasses to draw the view’s image within the specified rectangle.


A Boolean value indicating whether drawing commands will produce any results.


The portion of the view that is not clipped by its superviews.

- getRectsBeingDrawn:count:

Returns by indirection a list of nonoverlapping rectangles that define the area the view is being asked to draw in drawRect:.

- needsToDrawRect:

Returns a Boolean value indicating whether the specified rectangle intersects any part of the area that the view is being asked to draw.


A Boolean value indicating whether AppKit’s default clipping behavior is in effect.

- bitmapImageRepForCachingDisplayInRect:

Returns a bitmap-representation object suitable for caching the specified portion of the view.

- cacheDisplayInRect:toBitmapImageRep:

Draws the specified area of the view, and its descendants, into a provided bitmap-representation object.