Indicates whether the device is currently connected.
- iOS 4.0+
- macOS 10.7+
The value of this property indicates whether the device represented by the receiver is connected and available for use as a capture device. When the value of this property becomes
false for a given instance, however, it will not become
true again. If the same physical device again becomes available to the system, it will be represented using a new instance of
You can observe changes to the value of this property using Key-value observing.