iphone – 如何在iOS 7音频中断后恢复音频会话？

概述在iOS 7中,在我的音频中断监听器被调用之后,任何恢复音频会话的尝试似乎都会无声地失败. 我的中断听众打电话 NSError *activationError = nil;[[AVAudioSession sharedInstance] setActive:YES error:&activationError]; 但是一旦闹钟响起,应用程序的音频会话就会消失.使用适当的开始和结束状态调用侦听器 在iOS 7中,在我的音频中断监听器被调用之后,任何恢复音频会话的尝试似乎都会无声地失败.

我的中断听众打电话

NSError *activationError = nil;[[AVAudioSession sharedInstance] setActive:YES error:&activationError];

但是一旦闹钟响起,应用程序的音频会话就会消失.使用适当的开始和结束状态调用侦听器.

它在iOS 6上运行得很好.

我听说这是iOS 7中的bug并且有一种解决方法,但找不到它.

有没有人知道Apple的变通方法或技术说明的链接？

编辑：我发现我必须使用AVAudioSessioncategoryPlayback而不是kAudioSessioncategory_AmbIEntSound.现在它有效.但它不是我想要的类别.

解决方法 你可以在下面看到我的代码.但首先,

您应该选择此位目标|背景模式|来自功能的音频,Airplay和画中画.

//  VIEwController.m//  AVAudioPlayer#import "VIEwController.h"@import AVFoundation;@import MediaPlayer;@interface VIEwController ()@property (strong,nonatomic) AVAudioPlayer *audioPlayer;@property (weak,nonatomic) IBOutlet UiSlider *volumeSlIDer;@property (weak,nonatomic) IBOutlet UiSlider *rateSlIDer;@end@implementation VIEwController- (voID)vIEwDIDLoad {    [super vIEwDIDLoad];    // Do any additional setup after loading the vIEw,typically from a nib.    [self setupAudio];}- (voID) setupAudio {    NSError *error;    [[AVAudioSession sharedInstance] setActive:YES error:&error];    if (error != nil) {        NSAssert(error == nil,@"");    }    [[AVAudioSession sharedInstance] setcategory:AVAudioSessioncategoryPlayback error:&error];    if (error != nil) {        NSAssert(error == nil,@"");    }    NSURL *soundURL = [[NSBundle mainBundle] URLForResource:@"SoManyTimes" withExtension:@"mp3"];    self.audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:soundURL error:&error];    if (error != nil) {        NSAssert(error == nil,@"");    }    //[self.audioPlayer setVolume:0.8];    self.audioPlayer.enableRate = YES;    [self.audioPlayer preparetoPlay];    [self.audioPlayer setVolume:self.volumeSlIDer.value];    [[NSNotificationCenter defaultCenter] addobserver:self selector:@selector(audioInterrupt:) name:AVAudioSessionInterruptionNotification object:nil];    [[NSNotificationCenter defaultCenter] addobserver:self selector:@selector(audioRouteChanged:) name:AVAudioSessionRouteChangeNotification object:nil];    MPRemoteCommandCenter *commandCenter = [MPRemoteCommandCenter sharedCommandCenter];    [commandCenter.playCommand addTarget:self action:@selector(playbuttonpressed:)];    [commandCenter.stopCommand addTarget:self action:@selector(stopbuttonpressed:)];    [commandCenter.pauseCommand addTarget:self action:@selector(stopbuttonpressed:)];}- (voID) audioRouteChanged:(NSNotification*)notification {    NSNumber *reason = (NSNumber*)[notification.userInfo valueForKey:AVAudioSessionRouteChangeReasonKey];    switch ([reason integerValue]) {        case AVAudioSessionRouteChangeReasonoldDeviceUnavailable:        case AVAudioSessionRouteChangeReasonNoSuitableRouteForcategory:            [self stopbuttonpressed:nil];            break;        default:            break;    }}- (voID) audioInterrupt:(NSNotification*)notification {    NSNumber *interruptionType = (NSNumber*)[notification.userInfo valueForKey:AVAudioSessionInterruptionTypeKey];    switch ([interruptionType integerValue]) {        case AVAudioSessionInterruptionTypeBegan:            [self stopbuttonpressed:nil];            break;        case AVAudioSessionInterruptionTypeEnded:        {            if ([(NSNumber*)[notification.userInfo valueForKey:AVAudioSessionInterruptionoptionKey] intValue] == AVAudioSessionInterruptionoptionShouldResume) {                [self playbuttonpressed:nil];            }            break;        }        default:            break;    }}- (IBAction)playbuttonpressed:(ID)sender {    BOol played = [self.audioPlayer play];    if (!played) {        NSLog(@"Error");    }    MPMediaItemArtwork *albumart = [[MPMediaItemArtwork alloc] initWithImage:[UIImage imagenamed:@"CoverArt"]];    NSDictionary *songInfo = @{                               MPMediaItemPropertyTitle:@"So Many Times",MPMediaItemPropertyArtist:@"The Jellybricks",MPMediaItemPropertyAlbumTitle:@"Soap Opera",MPMediaItemPropertyArtwork:albumart,MPMediaItemPropertyPlaybackDuration:@(self.audioPlayer.duration),MPNowPlayingInfoPropertyElapsedplaybackTime:@(self.audioPlayer.currentTime),};    [[MPNowPlayingInfoCenter defaultCenter] setNowPlayingInfo:songInfo];}- (IBAction)stopbuttonpressed:(ID)sender {    [self.audioPlayer stop];}- (IBAction)volumeSlIDerChanged:(UiSlider*)sender {    [self.audioPlayer setVolume:sender.value];}- (IBAction)rateSlIDerChanged:(UiSlider*)sender {    [self.audioPlayer setRate:sender.value];}- (voID)dIDReceiveMemoryWarning {    [super dIDReceiveMemoryWarning];    // dispose of any resources that can be recreated.}- (voID) dealloc {    [[NSNotificationCenter defaultCenter] removeObserver:self];}@end

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