AVAudioSession extension for easy switch between categories and session activation and deactivation with error check and logging.

AVAudioSession+Switch.h

//
//  AVAudioSession+Switch.h
//
//  Created by Anton Shebukov on 09/06/16.
//  Copyright (c) 2013-2017 Feedback Italia S.r.l. All rights reserved.
//


#import <AVFoundation/AVFoundation.h>


@interface AVAudioSession (SwitchAddition)

- (BOOL)switchToPlayAndRecordCategory;
- (BOOL)switchToPlaybackCategory;
- (BOOL)switchToRecordCategory;

- (BOOL)setMaxInputGain;

- (BOOL)activate;
- (BOOL)deactiveAndNotifyOthers;

@end

AVAudioSession+Switch.m

//
//  AVAudioSession+Switch.m
//
//  Created by Anton Shebukov on 09/06/16.
//  Copyright (c) 2013-2017 Feedback Italia S.r.l. All rights reserved.
//

#import "AVAudioSession+Switch.h"

#import "GTMLogger.h"


@implementation AVAudioSession (SwitchAddition)


- (BOOL)switchToPlayAndRecordCategory {
    [[GTMLogger sharedLogger] logDebug:@"AVAudioSession::switchToPlayAndRecordCategory"];
    
    NSError *error = nil;
    
    [self setCategory:AVAudioSessionCategoryPlayAndRecord withOptions:AVAudioSessionCategoryOptionAllowBluetooth | AVAudioSessionCategoryOptionAllowBluetoothA2DP error:&error];
    if (error) {
        [[GTMLogger sharedLogger] logError:@"AVAudioSession::switchToPlayAndRecordCategory setCategory: %@ %ld %@", [error domain], (long)[error code], [[error userInfo] description]];
        return NO;
    }
    
    return YES;
}

- (BOOL)switchToPlaybackCategory {
    [[GTMLogger sharedLogger] logDebug:@"AVAudioSession::switchToPlaybackCategory"];
    
    NSError *error = nil;
    
    [self setCategory:AVAudioSessionCategoryPlayback withOptions:0 error:&error];
    if (error) {
        [[GTMLogger sharedLogger] logError:@"AVAudioSession::switchToPlaybackCategory setCategory: %@ %ld %@", [error domain], (long)[error code], [[error userInfo] description]];
        return NO;
    }
    
    return YES;
}

- (BOOL)switchToRecordCategory {
    [[GTMLogger sharedLogger] logDebug:@"AVAudioSession::switchToRecordCategory"];
    
    NSError *error = nil;
    
    [self setCategory:AVAudioSessionCategoryRecord withOptions:AVAudioSessionCategoryOptionAllowBluetooth error:&error];
    if (error) {
        [[GTMLogger sharedLogger] logError:@"AVAudioSession::switchToRecordCategory setCategory: %@ %ld %@", [error domain], (long)[error code], [[error userInfo] description]];
        return NO;
    }
    
    [self setMode:AVAudioSessionModeVideoRecording error:&error];
    if (error) {
        [[GTMLogger sharedLogger] logError:@"AVAudioSession::switchToRecordCategory setMode: %@ %ld %@", [error domain], (long)[error code], [[error userInfo] description]];
        return NO;
    }
    
    return YES;
}

- (BOOL)setMaxInputGain {
    [[GTMLogger sharedLogger] logDebug:@"AVAudioSession::setMaxInputGain"];
    
    NSError *error = nil;
    
    if (![self isInputAvailable]) {
        [[GTMLogger sharedLogger] logError:@"AVAudioSession::setMaxInputGain not isInputAvailable"];
        return NO;
    }
    
    if (![self isInputGainSettable]) {
        [[GTMLogger sharedLogger] logError:@"AVAudioSession::setMaxInputGain not isInputGainSettable"];
        return NO;
    }
    
    [self setInputGain:1.0 error:&error];
    if (error) {
        [[GTMLogger sharedLogger] logError:@"AVAudioSession::setMaxInputGain setInputGain: %@ %ld %@", [error domain], (long)[error code], [[error userInfo] description]];
        return NO;
    }
    
    return YES;
}

- (BOOL)activate {
    [[GTMLogger sharedLogger] logDebug:@"AVAudioSession::activate"];
    
    NSError *error = nil;
    
    [self setActive:YES withOptions:0 error:&error];
    if (error) {
        [[GTMLogger sharedLogger] logError:@"AVAudioSession::activate setActive: %@ %ld %@", [error domain], (long)[error code], [[error userInfo] description]];
        return NO;
    }
    
    return YES;
}

- (BOOL)deactiveAndNotifyOthers {
    [[GTMLogger sharedLogger] logDebug:@"AVAudioSession::deactiveAndNotifyOthers"];
    
    NSError *error = nil;
    
    [self setActive:NO withOptions:AVAudioSessionSetActiveOptionNotifyOthersOnDeactivation error:&error];
    if (error) {
        [[GTMLogger sharedLogger] logError:@"AVAudioSession::deactiveAndNotifyOthers setActive: %@ %ld %@", [error domain], (long)[error code], [[error userInfo] description]];
        return NO;
    }
    
    return YES;
}

@end