ios - AvAudioSession 在 iOS7 中不能工作？

Question

#import "SctreamAudioViewController.h"
#import <AVFoundation/AVFoundation.h>
#import "SecondViewController.h"

@interface SctreamAudioViewController ()
@property (nonatomic, strong) AVPlayer *player;
@end

@implementation SctreamAudioViewController

#define STREAM @"http://localhost/audio.mp3"

- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
AVAudioSession *audioSession = [AVAudioSession sharedInstance];
[audioSession setCategory:AVAudioSessionCategoryPlayAndRecord withOptions:AVAudioSessionCategoryOptionDefaultToSpeaker error:nil];
[audioSession setActive:YES error:nil];
NSURL *url = [[NSURL alloc] initWithString:STREAM];
self.player = [[AVPlayer alloc] initWithURL:url];
}

- (IBAction)play:(id)sender {

[self.player play];
}

我在网上做了很多研究，我认为这应该是在后台播放音频的正确方法。但是，它就是行不通。我不知道哪里出了问题。请帮忙。谢谢。

Answer 1

[[AVAudioSession sharedInstance] setActive:NO error:nil];
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback withOptions:AVAudioSessionCategoryOptionMixWithOthers error:nil];
[[AVAudioSession sharedInstance] setActive: YES error: nil];

如果你想在应用程序处于后台时播放音频，你应该使用类别 Playback 而不是 playAndRecord。另外需要勾选project->target->Capabilities->backgroundMode中的Audio和airPlay