5

I am working on a TextToSpeech app. I write one paragraph in a UITextField, then I press the Speak button. Sound plays according to the text written in the UITextField.

enter image description here

However, when the app is in background mode, the audio stops playing. How can I continue to play the sound in background mode? Similar to how an audio player can play a song in the background.

I am using the following code for text to speech:

#import "ViewController.h"
#import "Google_TTS_BySham.h"
#import <AVFoundation/AVFoundation.h>

@interface ViewController ()

@property (nonatomic,strong)Google_TTS_BySham *google_TTS_BySham;
@property (nonatomic,strong)IBOutlet UITextField *txtString;

@end

@implementation ViewController

#pragma mark - View Life Cycle

- (void)viewDidLoad {
    [super viewDidLoad];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}

#pragma mark - Button Tapped event

- (IBAction)btnSpeakTapped:(id)sender{
    NSString *str = [NSString stringWithFormat:@"%@",_txtString.text];
    self.google_TTS_BySham = [[Google_TTS_BySham alloc] init];
    [self.google_TTS_BySham speak:str];
}
Jagat Dave
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2 Answers2

6

Add the following code in info.plist file...

Application does not run in background : NO

Required background modes : App plays audio or streams audio/video using AirPlay

and then add the following code in AppDelegate.m file

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    [[AVAudioSession sharedInstance] setDelegate:self];
    [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
    [[AVAudioSession sharedInstance] setActive:YES error:nil];
    [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];

    UInt32 size = sizeof(CFStringRef);
    CFStringRef route;
    AudioSessionGetProperty(kAudioSessionProperty_AudioRoute, &size, &route);
    NSLog(@"route = %@", route);

    return YES;
}

- (void)remoteControlReceivedWithEvent:(UIEvent *)theEvent {

    if (theEvent.type == UIEventTypeRemoteControl)  {
        switch(theEvent.subtype)        {
            case UIEventSubtypeRemoteControlPlay:
                [[NSNotificationCenter defaultCenter] postNotificationName:@"TogglePlayPause" object:nil];
                break;
            case UIEventSubtypeRemoteControlPause:
                [[NSNotificationCenter defaultCenter] postNotificationName:@"TogglePlayPause" object:nil];
                break;
            case UIEventSubtypeRemoteControlStop:
                break;
            case UIEventSubtypeRemoteControlTogglePlayPause:
                [[NSNotificationCenter defaultCenter] postNotificationName:@"TogglePlayPause" object:nil];
                break;
            default:
                return;
        }
    }
}
sagar patel
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Jagat Dave
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  • how does that even work without playing any music file. your code is pretty much missing and if that even make sense for TTS at all? – Emil Aug 13 '23 at 17:47
1

Add "App plays audio or streams audio/video using AirPlay" under "Required background modes" property on your info.plist

Hope this will help...

Partho Biswas
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  • I add "App plays audio or streams audio/video using AirPlay" and "App provides Voice over IP services" under "Required background modes" property on my info.plist...It is work properly in simulator but not in real ios device – Jagat Dave Feb 05 '15 at 08:40
  • @AhmetAkkök Yes...It is working properly in real device. – Jagat Dave Jun 06 '17 at 04:42
  • @Jagat Dave Thank you, I understand that you have already provided the accepted answer here, appreciated – Ahmet Akkök Jun 06 '17 at 10:14