Stream availability checking

Since iOS SDK build 2.6.48 it is possible to check if a stream with a given name is available on a server for playback, like WebSDK function Stream.available().

To do this:

1. Create a separate Stream object with the stream name to check availability
   Objective C code
   

        FPWCSApi2Session *session = [FPWCSApi2 getSessions][0];
        FPWCSApi2StreamOptions *options = [[FPWCSApi2StreamOptions alloc] init];
        options.name = _remoteStreamName.text;
        options.display = _remoteDisplay;
        FPWCSApi2Stream *stream = [session createStream:options error:nil];
   

   Swift code
   

        let options = FPWCSApi2StreamOptions()
        options.name = playName.text;
        options.display = remoteDisplay.videoView;
        do {
            playStream = try session!.createStream(options)
            ...
        } catch {
            print(error)
        }
   

2. Call FPWCSApi2Stream.available() method with callback function to get availability status and reason if stream is not available
   Objective C code
   

        [stream available:^(BOOL available, NSString *info) {
            [self changeViewState:button enabled:YES];
            if (available) {
                _remoteStreamStatus.text = @"AVAILABLE";
                _remoteStreamStatus.textColor = [UIColor greenColor];
            } else {
                _remoteStreamStatus.text = info;
                _remoteStreamStatus.textColor = [UIColor redColor];
   
            }
        }];
   

   Swift code
   

        ...
        do {
            playStream = try session!.createStream(options)
            playStream?.available({ (available, info) in
                self.changeViewState(self.availableButton, true)
                if (available) {
                    self.playStatus.text = "AVAILABLE"
                    self.playStatus.textColor = .green
                } else {
                    self.playStatus.text = info
                    self.playStatus.textColor = .red
                }
            })
        } catch {
            print(error)
        }