ios - 应用程序处于后台模式时的文本到语音功能？

Question

我正在开发一个TextToSpeech应用程序。我在 a 中写了一段UITextField，然后按下Speak按钮。声音会根据 中写入的文字播放UITextField。

但是，当应用程序处于后台模式时，音频会停止播放。如何在后台模式下继续播放声音？类似于音频播放器在后台播放歌曲的方式。

我将以下代码用于文本到语音：

#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

在文件中添加以下代码info.plist...

应用程序不在后台运行：否

所需的背景模式：应用程序使用 AirPlay 播放音频或流式传输音频/视频

然后在AppDelegate.m文件中添加以下代码

- (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

在 info.plist 的“所需背景模式”属性下添加“应用程序使用 AirPlay 播放音频或流式传输音频/视频”

希望这会有所帮助...