Instance Property


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


@property(readonly) BOOL wantsDefaultClipping;

Return Value

YES if the default clipping is in effect, NO otherwise. By default, this method returns YES.


The default value of this property is YES. When the value of this property is YES, AppKit sets the current clipping region to the bounds of the view prior to calling that view’s drawRect: method. Subclasses may override this property and return NO to suppress this default clipping behavior. You might do this to avoid the cost of setting up, enforcing, and cleaning up the clipping path. If you do change the value to NO, you are responsible for doing your own clipping or constraining drawing appropriately. Failure to do so could the view to corrupt the contents of other views in the window.

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.


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


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.

- 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.