ios - 音频不在背景模式下播放

当我的应用进入后台模式时，我想在5 seconds之后播放“音频”。 NSTimer正确触发。 5秒后我收到了NSLog(@"repeat");。但是，有些声音无法播放。我在目标中启用了背景模式。我尝试了许多其他解决方案，可以在stackoverflow中找到，但是没有运气。任何人都可以为我提供正确的解决方案。

在我的appdelegate.h文件中:

#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>

@interface AppDelegate : UIResponder <UIApplicationDelegate>
{
    NSTimer* timer;
}

@property (strong, nonatomic) UIWindow *window;

@property (nonatomic, strong) NSString *musicName;
@property (nonatomic, strong) AVAudioPlayer *audioPlayer;

在我的appdelegate.m文件中:

#import "AppDelegate.h"

@interface AppDelegate ()

@end

@implementation AppDelegate

@synthesize
musicName,
audioPlayer;

-(void) playAlarmSound
{
    musicName = @"note3BreakOf.mp3";
    // Construct URL to sound file
    NSString *path = [NSString stringWithFormat:@"%@/%@", [[NSBundle mainBundle] resourcePath], musicName];
    NSURL *soundUrl = [NSURL fileURLWithPath:path];

    // Create audio player object and initialize with URL to sound
    audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:soundUrl error:nil];
}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    [self playAlarmSound];
    return YES;
}

-(void)methodRunAfterBackground
{
    [audioPlayer play];
    [timer invalidate];
    NSLog(@"repeat");
}

- (void)applicationDidEnterBackground:(UIApplication *)application
{
    UIApplication *app = [UIApplication sharedApplication];

    //create new uiBackgroundTask
    __block UIBackgroundTaskIdentifier bgTask = [app beginBackgroundTaskWithExpirationHandler:^{
        [app endBackgroundTask:bgTask];
        bgTask = UIBackgroundTaskInvalid;
    }];

    //and create new timer with async call:
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        //run function methodRunAfterBackground
        timer = [NSTimer scheduledTimerWithTimeInterval:5 target:self selector:@selector(methodRunAfterBackground) userInfo:nil repeats:NO];
        [[NSRunLoop currentRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode];
        [[NSRunLoop currentRunLoop] run];
    });
}

最佳答案

您需要将“playsAudio”添加到您的plist并进行设置

AVAudioSession sharedInstance类别改为:AVAudioSessionCategoryPlayback

AVAudioSession sharedInstance
setActive:是

UIApplication sharedApplication
beginReceivingRemoteControlEvents

似乎其中一些可能已被弃用，请检查here

在Objective-C中:

[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
[[AVAudioSession sharedInstance] setActive: YES error: nil];
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];

关于ios - 音频不在背景模式下播放，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/27901899/