Class

AVSynchronizedLayer

An object used to synchronize with a specific player item.

Declaration

class AVSynchronizedLayer : CALayer

Overview

You can create an arbitrary number of synchronized layers from the same AVPlayerItem object.

A synchronized layer is similar to a CATransformLayer object in that it doesn't display anything itself, it just confers state upon its layer subtree. AVSynchronizedLayer confers its timing state, synchronizing the timing of layers in its subtree with that of a player item.

Any CoreAnimation layer with animation property set that is added as a sublayer of AVSynchronizedLayer should set the animation's beginTime property to a non-zero positive value so animations will be interpreted on the player item's timeline. CoreAnimation replaces the default beginTime of 0.0 with CACurrentMediaTime(). To start the animation from time 0, use a small positive value like AVCoreAnimationBeginTimeAtZero.

You might use a layer as shown in the following example:

AVPlayerItem *playerItem = <#Get a player item#>;
CALayer *superLayer =  <#Get a layer#>;
// Set up a synchronized layer to sync the layer timing of its subtree
// with the playback of the playerItem/
AVSynchronizedLayer *syncLayer = [AVSynchronizedLayer synchronizedLayerWithPlayerItem:playerItem];
[syncLayer addSublayer:<#Another layer#>];    // These sublayers will be synchronized.
[superLayer addSublayer:syncLayer];

Topics

Creating a Synchronized Layer

init(playerItem: AVPlayerItem)

Creates a new synchronized layer with timing synchronized with a given player item.

Managing the Player Item

var playerItem: AVPlayerItem?

The player item to which the timing of the layer is synchronized.

Supporting Types

let AVCoreAnimationBeginTimeAtZero: CFTimeInterval

A value that sets an animation begin time to 0.

Relationships

Inherits From

CALayer