iOS: Fixed a bug in the audio channels of the simulator and older versions of iOS

modules/juce_audio_devices/native/juce_ios_Audio.cpp

@@ -1195,6 +1195,10 @@ struct iOSAudioIODevice::Pimpl      : public AudioPlayHead,
                         result.add (nsStringToJuce (desc.channelName));
                 }
 
+                // A fallback for the iOS simulator and older iOS versions
+                if (result.isEmpty())
+                    return { "Left", "Right" };
+
                 return result;
             }
 
@@ -1202,8 +1206,9 @@ struct iOSAudioIODevice::Pimpl      : public AudioPlayHead,
                                                                BigInteger requiredChannels)
             {
                 requiredChannels.setRange (numHardwareChannelsAvailable,
-                                           requiredChannels.getHighestBit(),
+                                           requiredChannels.getHighestBit() + 1,
                                            false);
+
                 return requiredChannels;
             }
 

modules/juce_audio_processors/processors/juce_AudioProcessor.cpp

@@ -395,9 +395,15 @@ void AudioProcessor::setPlayConfigDetails (const int newNumIns,
     if (getTotalNumInputChannels()  != newNumIns)
         success &= setChannelLayoutOfBus (true,  0, AudioChannelSet::canonicalChannelSet (newNumIns));
 
+    // failed to find a compatible input configuration
+    jassert (success);
+
     if (getTotalNumOutputChannels() != newNumOuts)
         success &= setChannelLayoutOfBus (false, 0, AudioChannelSet::canonicalChannelSet (newNumOuts));
 
+    // failed to find a compatible output configuration
+    jassert (success);
+
     // if the user is using this method then they do not want any side-buses or aux outputs
     success &= disableNonMainBuses();
     jassert (success);