ios - 如何将音频彼此叠加？

Question

您好，我正在构建一个可在用户摇动时播放声音的应用程序。这是我的代码:

#import "ViewController.h"
#define accelerationThreshold  0.5

@interface ViewController ()

@property (strong, nonatomic) CMMotionManager *motionManager;

@end

@implementation ViewController
AVAudioPlayer *myAudio;


- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.

[super viewDidLoad];
NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle]
                                     pathForResource:@"sound"
                                     ofType:@"wav"]];

NSError *error;
_audioPlayer = [[AVAudioPlayer alloc]
                initWithContentsOfURL:url
                error:&error];
if (error)
{
    NSLog(@"Error in audioPlayer: %@",
          [error localizedDescription]);
} else {
    _audioPlayer.delegate = self;
    [_audioPlayer prepareToPlay];
}

////
_motionManager = [[CMMotionManager alloc] init];
_motionManager.deviceMotionUpdateInterval = 0.5;

[_motionManager startDeviceMotionUpdatesToQueue: [NSOperationQueue currentQueue]  withHandler:^(CMDeviceMotion *motion, NSError *error)
{
    [self motionMethod:motion];
}];

}



- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.

[super viewDidLoad];
NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle]
                                     pathForResource:@"sound"
                                     ofType:@"wav"]];

NSError *error;
_audioPlayer = [[AVAudioPlayer alloc]
                initWithContentsOfURL:url
                error:&error];
if (error)
{
    NSLog(@"Error in audioPlayer: %@",
          [error localizedDescription]);
} else {
    _audioPlayer.delegate = self;
    [_audioPlayer prepareToPlay];
}

////
_motionManager = [[CMMotionManager alloc] init];
_motionManager.deviceMotionUpdateInterval = 0.5;

[_motionManager startDeviceMotionUpdatesToQueue: [NSOperationQueue currentQueue]  withHandler:^(CMDeviceMotion *motion, NSError *error)
{
    [self motionMethod:motion];
}];

}

- (IBAction)playAudio:(id)sender {
[_audioPlayer play];
}

-(void)motionMethod:(CMDeviceMotion *)deviceMotion
{
CMAcceleration userAcceleration = deviceMotion.userAcceleration;
if (fabs(userAcceleration.x) > accelerationThreshold
    || fabs(userAcceleration.y) > accelerationThreshold
    || fabs(userAcceleration.z) > accelerationThreshold)
{
    //Motion detected, handle it with method calls or additional
    //logic here.
    [self playAudio:self];
}
}

但是，我希望每次用户摇动设备时声音都覆盖当前声音，我该怎么做？由于当前播放声音的时间很短，我该如何解决？

Answer 1

要使用AVAudioPlayer同时播放多个声音，您需要多个AVAudioPlayer。您只有一个，因此每次将其发送给play时，它仍然是唯一的播放器。