Properties of the Calayer

Properties	Description	whether implicit animations are supported
Anchorpoint	A point position coincident with the center point, called an "anchor point," where the anchor is described by default at the center point of the image (0.5,0.5) relative to the X, Y position ratio	Is
BackgroundColor	Layer background color	Is
BorderColor	Border color	Is
BorderWidth	Border width	Is
Bounds	Layer Size	Is
Contents	Layers display content, such as the ability to display a picture as a layer content	Is
Contentsrect	The size and position of the layer display content	Is
Cornerradius	Fillet radius	Is
doublesided	If the back of the layer is displayed, the default is Yes	Whether
Frame	The layer size and position does not support implicit animation, so frame is rarely used in calayer, usually using bounds and position instead	Whether
Hidden	Whether to hide	Is
Mask	Layer Masks	Is
Masktobounds	Whether sublayers cut layer boundaries, default to No	Is
Opacity	Transparency, similar to the alpha of UIView	Is
Position	The location of the center point of the layer, similar to the UIView	Is
Shadowcolor	Shadow color	Is
Shadowoffset	Shadow Offset	Is
Shadowopacity	Shadow transparency, note the default is 0, this property must be set if the shadow is set	Is
Shadowpath	Shape of the Shadow	Is
Shadowradius	Shadow Blur Radius	Is
Sublayers	Sub-layer	Is
Sublayertransform	Child layer Deformation	Is
Transform	Layer deformation	Is

• Calayer in iOS is designed primarily for content presentation and animation operations, and Calayer itself is not included in Uikit, and it cannot respond to events.
  
• Calayer Many properties can be animated when modified, which is called an implicit animation property. The essence of implicit property animation is that the change of these attributes implies the Cabasicanimation animation implementation by default; The frame property is rarely used in Calayer because the frame itself does not support animation effects, usually using bounds and position instead. transparency in Calayer uses opacity instead of alpha, and the center point uses a position representation instead of center.
• The modification of a property is not animated for UIView's root layer, because in many cases the root layer acts more as a container
• UIView root layer creation work is completely done by iOS and cannot be recreated, but you can add sublayers or remove sublayers to the root layer

Properties of the Calayer