AVAudioPlayer 泄漏和崩溃答案

【问题标题】：AVAudioPlayer Leak and CrashAVAudioPlayer 泄漏和崩溃
【发布时间】：2011-02-22 18:31:47
【问题描述】：

我想使用 IBAction 和 AVAudioPlayer 播放多个音频文件 (.WAV)。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。你能帮帮我吗？

这是我的代码。

ViewController.h

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

@interface ViewController : UIViewController <AVAudioPlayerDelegate>
{
    NSString        *Path;
}

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

@end

ViewController.m

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

@implementation ViewController

AVAudioPlayer *Media;

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

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

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

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

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

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

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

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

@end

【问题讨论】：

标签： iphone objective-c xcode memory-management avaudioplayer

【解决方案1】：

您的代码中有几处看起来有问题：

(1)。没有方法Release，[Media Release]应该是[Media release]；

(2)。如果您在 Sound1 仍在播放时播放 Sound2，则会泄漏 Media 实例：

Media = [[AVAudioPlayer alloc] initWithContentsOfURL:...

这会分配新播放器并覆盖旧播放器而不先释放它；

(3)。在委托中释放调用对象通常是个坏主意；

(4)。我还建议将 Media 重命名为 media 和 Path 重命名为 path。

所以播放动作应该是这样的：


- (IBAction)playSound1
{
    path = [[NSBundle mainBundle] pathForResource:@"Sound1" ofType:@"wav"];
    media = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL];
    [media play];
    [media release];
}

【讨论】：