AVAudioPlayer崩溃

Question

我的iOS应用程序有一个问题。我想播放多个音频文件(.WAV)使用IBAction和AVAudioPlayer。不幸的是，声音会播放，但如果我多次播放声音，我的应用程序就会崩溃。也许是因为内存没有被正确释放。你能证实我的假设和/或告诉我如何解决这个问题吗？

这是我的密码。

ViewController.h

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

@interface ViewController : UIViewController
{
    NSString        *Path;
}

- (IBAction)Sound1;
- (IBAction)Sound2;
- (IBAction)Sound3;
- (IBAction)Sound4;

@end

ViewController.m

#import <AVFoundation/AVAudioPlayer.h>
#import "ViewController.h"

@implementation ViewController

- (IBAction)Sound1
{
    Path = [[NSBundle mainBundle] pathForResource:@"Sound1" ofType:@"wav"];
    Media = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:Path] error:NULL];
    [Media play];
}

- (IBAction)Sound2
{
    Path = [[NSBundle mainBundle] pathForResource:@"Sound2" ofType:@"wav"];
    Media = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:Path] error:NULL];
    [Media play];
}

- (IBAction)Sound3
{
    Path = [[NSBundle mainBundle] pathForResource:@"Sound3" ofType:@"wav"];
    Media = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:Path] error:NULL];
    [Media play];
}

- (IBAction)Sound4
{
    Path = [[NSBundle mainBundle] pathForResource:@"Sound4" ofType:@"wav"];
    Media = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:Path] error:NULL];
    [Media play];
}

- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag
{
    [player release];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
}

- (void)viewDidUnload
{
    [super viewDidUnload];
}

- (void)dealloc
{
    [super dealloc];
}

@end

Answer 1

问题是，您分配了大量的AVAudioPlayer实例，但没有发布任何实例。

您需要做的是将类设置为AVAudioPlayerDelegate，从类中删除媒体实例变量(相反，只需在各种IBAction方法中创建一个新实例变量)，并按如下方式实现audioPlayerDidFinishPlaying:successfully:方法：

- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag {
    [player release];
}

最后，更新代码，将类设置为您设置的每个AVAudioPlayers的委托，如下所示：

...
Media = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:Path] error:NULL];
[Media setDelegate:self];
[Media play];
...

通过这样做，您将确保发布您创建的所有AVAudioPlayer实例。

Answer 2

媒体从不发布..。这导致了内存泄漏。使用SetterGetter方法，以便每当分配新对象时，就会释放前一个对象。