锁定后，AVAudioPlayer无法在iPhone 5中播放音频 [英] AVAudioPlayer doesn't play audio in iPhone 5 when locked

问题描述

使用AVAudioPlayer我正在尝试在iphone播放器播放声音.同样在设备锁定时. 事实是，在iPhone 4s ios 7中-可以正常工作. 但是在装有6和7 ios的iPhone 5上，什么也没发生.

Using AVAudioPlayer I'm trying to play sounds while the iphone player is playing. Also when device is locked. The thing is, that in iPhone 4s ios 7 - works fine. But on iPhone 5 with 6 and 7 ios nothing happens.

在Required background modes的-Info.plist中，我写了

App plays audio or streams audio/video using AirPlay

:

@property (nonatomic, strong) AVAudioPlayer *notificationPlayer;

<AVAudioPlayerDelegate, AVAudioSessionDelegate>与 包含#import <AVFoundation/AVFoundation.h>

也在Player.m

//this is called on viewDidLoad
-(void) prepareSound{
    [[AVAudioSession sharedInstance] setDelegate:self];
}
//overriden function
- (void)playAudio:(NSString *)path{
    [[AVAudioSession sharedInstance]
     setCategory: AVAudioSessionCategoryAmbient
     withOptions: AVAudioSessionCategoryOptionDuckOthers
     error: nil];

    NSError *error;
    NSURL *audioURL = [NSURL fileURLWithPath:path];

    self.notificationPlayer = [[AVAudioPlayer alloc]initWithContentsOfURL:audioURL error:&error];
    self.notificationPlayer.delegate = self;
    [self.notificationPlayer prepareToPlay];
    [self.notificationPlayer setVolume:1.0];
    [self.notificationPlayer play];
    if (error) {
        NSLog(@"error %@",[error localizedDescription]);
    }
}

- (void) audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag{
    [player stop]; 
    [[AVAudioSession sharedInstance] setActive:NO withOptions:0 error:nil];
    [[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategoryAmbient
                                     withOptions: 0
                                           error: nil];
    [[AVAudioSession sharedInstance] setActive:YES withOptions: 0 error:nil];
}
//Call from here
-(void) customMethod{
    [self playAudio:[[NSBundle mainBundle] pathForResource:@"3" ofType:@"wav"]];
}

致谢.

推荐答案

我应该使用以下代码

- (void)playAudio:(NSString *)path {
NSError *error;
NSURL *audioURL = [NSURL fileURLWithPath:path];

self.notificationPlayer = [[AVAudioPlayer alloc]initWithContentsOfURL:audioURL error:&error];
self.notificationPlayer.delegate = self;

AVAudioSession* audioSession = [AVAudioSession sharedInstance];
NSError *errorSession = nil;
[audioSession setCategory:AVAudioSessionCategoryPlayback withOptions:AVAudioSessionCategoryOptionDuckOthers error:nil];
[audioSession setActive:NO error:&errorSession];

[self.notificationPlayer prepareToPlay];
[self.notificationPlayer setVolume:1.0];
[self.notificationPlayer play];
if (error) {
    NSLog(@"error %@",[error localizedDescription]);
}
NSLog(@"Should play music");
}

- (void) audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag{
[player stop];
[[AVAudioSession sharedInstance] setActive:NO withFlags:AVAudioSessionSetActiveOptionNotifyOthersOnDeactivation error:nil];
}

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