largeThumbnailIfAvailable
A large thumbnail for the item if one is readily available.
Declaration
var largeThumbnailIfAvailable: CGImage? { get }Discussion
If a large thumbnail is not readily available, accessing this property requests it from the device.
When the thumbnail is received, cameraDevice(_:didReceiveThumbnailFor:) is called on the the device’s delegate.
Execution of the delegate callback occurs on the main thread.