JAGAT JAGAT - 1 year ago 88
Objective-C Question

Adding Text To Speech functionality when app is in background mode?

I am working on a

app. I write one paragraph in a
, then i press the Speak button. Sound plays according to the text written in the

enter image description here

However, when the app is in background mode, the audio play stops playing. How can I continue playing 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;


@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 Source

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];
            case UIEventSubtypeRemoteControlPause:
                [[NSNotificationCenter defaultCenter] postNotificationName:@"TogglePlayPause" object:nil];
            case UIEventSubtypeRemoteControlStop:
            case UIEventSubtypeRemoteControlTogglePlayPause:
                [[NSNotificationCenter defaultCenter] postNotificationName:@"TogglePlayPause" object:nil];
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