Instance Property


A Boolean value indicating whether the layer contains completely opaque content.


@property(getter=isOpaque) BOOL opaque;


The default value of this property is NO. If your app draws completely opaque content that fills the layer’s bounds, setting this property to YES lets the system optimize the rendering behavior for the layer. Specifically, when the layer creates the backing store for your drawing commands, Core Animation omits the alpha channel of that backing store. Doing so can improve the performance of compositing operations. If you set the value of this property to YES, you must fill the layer’s bounds with opaque content.

Setting this property affects only the backing store managed by Core Animation. If you assign an image with an alpha channel to the layer’s contents property, that image retains its alpha channel regardless of the value of this property.

See Also

Configuring the Layer’s Rendering Behavior


A bitmask defining how the edges of the receiver are rasterized.

- contentsAreFlipped

Returns a Boolean indicating whether the layer content is implicitly flipped when rendered.


A Boolean that indicates whether the geometry of the layer and its sublayers is flipped vertically.


A Boolean indicating whether drawing commands are deferred and processed asynchronously in a background thread.


A Boolean that indicates whether the layer is rendered as a bitmap before compositing. Animatable


The scale at which to rasterize content, relative to the coordinate space of the layer. Animatable


A hint for the desired storage format of the layer contents.

- renderInContext:

Renders the layer and its sublayers into the specified context.