Instance Property


A Boolean property that indicates whether the view is rendered using transparency.


@property(nonatomic) BOOL allowsTransparency;


This property tells the drawing system as to how it should treat the view. If set to NO, the drawing system treats the view as fully opaque, which allows the drawing system to optimize some drawing operations and improve performance. If set to YES, the drawing system composites the view normally with other content. The default value of this property is NO.

An opaque view is expected to fill its bounds with entirely opaque content—that is, the content should have an alpha value of 1.0. If the view is opaque and either does not fill its bounds or contains wholly or partially transparent content, the results are unpredictable. Always set the value of this property to NO if the view is fully or partially transparent.

See Also

Configuring Performance Related Toggles


A Boolean value that indicates whether parent-child and sibling relationships affect the rendering order of nodes in the scene.


A Boolean value that indicates whether the view automatically culls non-visible nodes from the rendering tree.


A Boolean value that indicates whether the content is rendered asynchronously.