Text to Speech function when the application is in the background?

Question

I am working on a TextToSpeech application. I write one paragraph in a UITextField , then click the Speak button. The sound is played in accordance with the text recorded in the UITextField .

However, when the application is in the background, the sound stops playing. How to continue playing sound in the background? Just like an audio player can play a song in the background.

I use 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]; } 

Answer 1

Add the following code to info.plist ...

Application does not work in background: NO

Necessary background modes: the application plays audio or streams of audio / video using AirPlay

and then add the following code to the 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; } } } 

Answer 2

Add “The application plays audio or audio / video streams using AirPlay” in the “Required background modes” section on your info.plist

Hope this helps ...