# <GCKMediaControlChannelDelegate> Protocol [Instance Methods](https://developers.google.com/cast/v3/reference/ios/protocol_g_c_k_media_control_channel_delegate-p#pub-methods) \ Protocol Reference ## Overview The [GCKMediaControlChannel](https://developers.google.com/cast/v3/reference/ios/interface_g_c_k_media_control_channel "A GCKCastChannel subclass for media control operations. ") delegate protocol. Inherits \. |---|---| | ## Instance Method Summary || | (void) | - [mediaControlChannel:didCompleteLoadWithSessionID:](https://developers.google.com/cast/v3/reference/ios/protocol_g_c_k_media_control_channel_delegate-p#a2d13d021e5ecebbb6ef34bb25cabb415) | | | Called when a request to load media has completed. [More...](https://developers.google.com/cast/v3/reference/ios/protocol_g_c_k_media_control_channel_delegate-p#a2d13d021e5ecebbb6ef34bb25cabb415) | | || | (void) | - [mediaControlChannel:didFailToLoadMediaWithError:](https://developers.google.com/cast/v3/reference/ios/protocol_g_c_k_media_control_channel_delegate-p#a0dac7c79e5e062a01afb826afa001c93) | | | Called when a request to load media has failed. [More...](https://developers.google.com/cast/v3/reference/ios/protocol_g_c_k_media_control_channel_delegate-p#a0dac7c79e5e062a01afb826afa001c93) | | || | (void) | - [mediaControlChannelDidUpdateStatus:](https://developers.google.com/cast/v3/reference/ios/protocol_g_c_k_media_control_channel_delegate-p#a0fd482bf2cfa5a79bf1d443a07c10298) | | | Called when updated player status information is received. [More...](https://developers.google.com/cast/v3/reference/ios/protocol_g_c_k_media_control_channel_delegate-p#a0fd482bf2cfa5a79bf1d443a07c10298) | | || | (void) | - [mediaControlChannelDidUpdateQueue:](https://developers.google.com/cast/v3/reference/ios/protocol_g_c_k_media_control_channel_delegate-p#a33493fb2742cd3f2e2918555ddd39cac) | | | Called when updated queue status information is received. [More...](https://developers.google.com/cast/v3/reference/ios/protocol_g_c_k_media_control_channel_delegate-p#a33493fb2742cd3f2e2918555ddd39cac) | | || | (void) | - [mediaControlChannelDidUpdatePreloadStatus:](https://developers.google.com/cast/v3/reference/ios/protocol_g_c_k_media_control_channel_delegate-p#a0495197c63c041e6b33d3e6824521ed4) | | | Called when updated preload status is received. [More...](https://developers.google.com/cast/v3/reference/ios/protocol_g_c_k_media_control_channel_delegate-p#a0495197c63c041e6b33d3e6824521ed4) | | || | (void) | - [mediaControlChannelDidUpdateMetadata:](https://developers.google.com/cast/v3/reference/ios/protocol_g_c_k_media_control_channel_delegate-p#aa4806bab8620540325ae199c3574b034) | | | Called when updated media metadata is received. [More...](https://developers.google.com/cast/v3/reference/ios/protocol_g_c_k_media_control_channel_delegate-p#aa4806bab8620540325ae199c3574b034) | | || | (void) | - [mediaControlChannel:requestDidCompleteWithID:](https://developers.google.com/cast/v3/reference/ios/protocol_g_c_k_media_control_channel_delegate-p#adf270fee936b43be996bcafc141e47b9) | | | Called when a request succeeds. [More...](https://developers.google.com/cast/v3/reference/ios/protocol_g_c_k_media_control_channel_delegate-p#adf270fee936b43be996bcafc141e47b9) | | || | (void) | - [mediaControlChannel:didReplaceRequestWithID:](https://developers.google.com/cast/v3/reference/ios/protocol_g_c_k_media_control_channel_delegate-p#abee3342b4b0455b507132885d9a9aad1) | | | Called when a request is no longer being tracked because another request of the same type has been issued by the application. [More...](https://developers.google.com/cast/v3/reference/ios/protocol_g_c_k_media_control_channel_delegate-p#abee3342b4b0455b507132885d9a9aad1) | | || | (void) | - [mediaControlChannel:didCancelRequestWithID:](https://developers.google.com/cast/v3/reference/ios/protocol_g_c_k_media_control_channel_delegate-p#a14f80e1928401ce54caa8d41c4004dc3) | | | Called when a request is no longer being tracked because it has been explicitly cancelled. [More...](https://developers.google.com/cast/v3/reference/ios/protocol_g_c_k_media_control_channel_delegate-p#a14f80e1928401ce54caa8d41c4004dc3) | | || | (void) | - [mediaControlChannel:requestDidFailWithID:error:](https://developers.google.com/cast/v3/reference/ios/protocol_g_c_k_media_control_channel_delegate-p#a420be0323e2b9663027774beada042bb) | | | Called when a request fails. [More...](https://developers.google.com/cast/v3/reference/ios/protocol_g_c_k_media_control_channel_delegate-p#a420be0323e2b9663027774beada042bb) | | || ## Method Detail |---|---| | |---|---|---|---| | - (void) mediaControlChannel: | | ([GCKMediaControlChannel](https://developers.google.com/cast/v3/reference/ios/interface_g_c_k_media_control_channel) \*) | *mediaControlChannel* | | didCompleteLoadWithSessionID: | | (NSInteger) | *sessionID* | | | | | | | optional | Called when a request to load media has completed. Parameters : |---|---| | mediaControlChannel | The channel. | | sessionID | The unique media session ID that has been assigned to this media item. | |---|---| | |---|---|---|---| | - (void) mediaControlChannel: | | ([GCKMediaControlChannel](https://developers.google.com/cast/v3/reference/ios/interface_g_c_k_media_control_channel) \*) | *mediaControlChannel* | | didFailToLoadMediaWithError: | | ([GCKError](https://developers.google.com/cast/v3/reference/ios/interface_g_c_k_error) \*) | *error* | | | | | | | optional | Called when a request to load media has failed. Parameters : |---|---| | mediaControlChannel | The channel. | | error | The load error. | |---|---| | |---|---|---|---|---| | - (void) mediaControlChannelDidUpdateStatus: | | ([GCKMediaControlChannel](https://developers.google.com/cast/v3/reference/ios/interface_g_c_k_media_control_channel) \*) | *mediaControlChannel* | | | optional | Called when updated player status information is received. Parameters : |---|---| | mediaControlChannel | The channel. | |---|---| | |---|---|---|---|---| | - (void) mediaControlChannelDidUpdateQueue: | | ([GCKMediaControlChannel](https://developers.google.com/cast/v3/reference/ios/interface_g_c_k_media_control_channel) \*) | *mediaControlChannel* | | | optional | Called when updated queue status information is received. Parameters : |---|---| | mediaControlChannel | The channel. | |---|---| | |---|---|---|---|---| | - (void) mediaControlChannelDidUpdatePreloadStatus: | | ([GCKMediaControlChannel](https://developers.google.com/cast/v3/reference/ios/interface_g_c_k_media_control_channel) \*) | *mediaControlChannel* | | | optional | Called when updated preload status is received. Parameters : |---|---| | mediaControlChannel | The channel. | |---|---| | |---|---|---|---|---| | - (void) mediaControlChannelDidUpdateMetadata: | | ([GCKMediaControlChannel](https://developers.google.com/cast/v3/reference/ios/interface_g_c_k_media_control_channel) \*) | *mediaControlChannel* | | | optional | Called when updated media metadata is received. Parameters : |---|---| | mediaControlChannel | The channel. | |---|---| | |---|---|---|---| | - (void) mediaControlChannel: | | ([GCKMediaControlChannel](https://developers.google.com/cast/v3/reference/ios/interface_g_c_k_media_control_channel) \*) | *mediaControlChannel* | | requestDidCompleteWithID: | | (NSInteger) | *requestID* | | | | | | | optional | Called when a request succeeds. Parameters : |---|---| | mediaControlChannel | The channel. | | requestID | The request ID that failed. This is the ID returned when the request was made. | |---|---| | |---|---|---|---| | - (void) mediaControlChannel: | | ([GCKMediaControlChannel](https://developers.google.com/cast/v3/reference/ios/interface_g_c_k_media_control_channel) \*) | *mediaControlChannel* | | didReplaceRequestWithID: | | (NSInteger) | *requestID* | | | | | | | optional | Called when a request is no longer being tracked because another request of the same type has been issued by the application. Parameters : |---|---| | mediaControlChannel | The channel. | | requestID | The request ID that has been replaced. This is the ID returned when the request was made. | |---|---| | |---|---|---|---| | - (void) mediaControlChannel: | | ([GCKMediaControlChannel](https://developers.google.com/cast/v3/reference/ios/interface_g_c_k_media_control_channel) \*) | *mediaControlChannel* | | didCancelRequestWithID: | | (NSInteger) | *requestID* | | | | | | | optional | Called when a request is no longer being tracked because it has been explicitly cancelled. Parameters : |---|---| | mediaControlChannel | The channel. | | requestID | The request ID that has been cancelled. This is the ID returned when the request was made. | |---|---| | |---|---|---|---| | - (void) mediaControlChannel: | | ([GCKMediaControlChannel](https://developers.google.com/cast/v3/reference/ios/interface_g_c_k_media_control_channel) \*) | *mediaControlChannel* | | requestDidFailWithID: | | (NSInteger) | *requestID* | | error: | | ([GCKError](https://developers.google.com/cast/v3/reference/ios/interface_g_c_k_error) \*) | *error* | | | | | | | optional | Called when a request fails. Parameters : |---|---| | mediaControlChannel | The channel. | | requestID | The request ID that failed. This is the ID returned when the request was made. | | error | The error. If any custom data was associated with the error, it will be in the error's userInfo dictionary with the key[kGCKErrorCustomDataKey](https://developers.google.com/cast/v3/reference/ios/g_c_k_error_8h#a6217ab0dfe1c723d8c6f4e19d61fe2f1) . |