停止播放其他声音之前 [英] Stop a sound Before PLaying another

问题描述

我知道在此之前已经有人问过这个问题，但是我不理解答复。我正在制作一个音板，当您单击其中一个按钮播放声音时，我希望已经播放的声音停止播放。我知道我需要添加 AudioServicesDisposeSystemSoundID（soundID）; ，但是我应该在哪里添加呢？这是我的代码：

I know that this has been asked before on here, but i didn't understand the responses. I am making a soundboard, and when you click one of the buttons to play a sound, i would like the one that was already playing to stop. I know i need to add AudioServicesDisposeSystemSoundID(soundID);, but where do i add it? Here is my code:

- (IBAction)beyond:(id)sender {
    CFBundleRef mainBundle = CFBundleGetMainBundle();
    CFURLRef soundFileURLRef;
    soundFileURLRef =  CFBundleCopyResourceURL(mainBundle, (CFStringRef) @"beyond" ,CFSTR ("wav") , NULL);
    UInt32 soundID;
    AudioServicesCreateSystemSoundID(soundFileURLRef, &soundID);
    AudioServicesPlaySystemSound(soundID);
   }

- (IBAction)Years:(id)sender {
    CFBundleRef mainBundle = CFBundleGetMainBundle();
    CFURLRef soundFileURLRef;
    soundFileURLRef =  CFBundleCopyResourceURL(mainBundle, (CFStringRef) @"years" ,CFSTR ("wav") , NULL);
    UInt32 soundID;
    AudioServicesCreateSystemSoundID(soundFileURLRef, &soundID);
    AudioServicesPlaySystemSound(soundID);
   }

推荐答案

之前被回答：
在Xcode中停止声音

但是我可以重复我的答案。

But I can repeat my answer.

总而言之，停止声音文件的句子是：

Summarizing, the sentence to STOP the sound file is:

AudioServicesDisposeSystemSoundID (soundFileObject);

说明（重要理解）：

我有一个包含18种不同声音文件的表格视图。当用户选择某一行必须听起来相应的文件，而选择另一行时，它必须停止上一个声音并播放其他声音。

I have a table view with 18 different sound files. When user select a row must sound the corresponding file and when select another row, it must STOP the previous sound and play other.

所有这些都是必要的：

1）将 AudioToolbox.framework添加到项目中的 Build Phases中，在 Link Binary With Libraries中

1) Add to your project "AudioToolbox.framework" inside "Build Phases", inside "Link Binary With Libraries"

2）在头文件中（在我的项目中，它称为 GenericTableView.h）添加以下语句：

2) In header file (in my project it calls "GenericTableView.h") add these sentences:

#include <AudioToolbox/AudioToolbox.h>

CFURLRef soundFileURLRef;
SystemSoundID soundFileObject;

@property (readwrite) CFURLRef soundFileURLRef;
@property (readonly) SystemSoundID soundFileObject;

3）在工具文件中（在我的项目中，它称为 GenericTableView.m）添加以下语句：

3) In implement file (in my project it calls "GenericTableView.m") add these sentences:

@synthesize soundFileURLRef;
@synthesize soundFileObject;

在您的动作实现中或在我的情况下，位于：

And inside your "Action" implementation or in my case, in:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

// -----------------------------------------------------------------------
// -----------------------------------------------------------------------
// -----------------------------------------------------------------------
//
// That is the question: a way to STOP sound file
//
// -----------------------------------------------------------------------
// Very important to STOP the sound file
AudioServicesDisposeSystemSoundID (soundFileObject);

// -----------------------------------------------------------------------
// -----------------------------------------------------------------------
// -----------------------------------------------------------------------


// In my project "rowText" is a field that save the name of the 
// corresponding sound (depending on row selected)
// It can be a string, @"Alarm Clock Bell" in example

// Create the URL for the source audio file.
// URLForResource:withExtension: method is new in iOS 4.0.
NSURL *soundURL = [[NSBundle mainBundle] URLForResource:rowText withExtension:@"caf"];

// Store the URL as a CFURLRef instance
self.soundFileURLRef = (CFURLRef) [soundURL retain];

// Create a system sound object representing the sound file.
AudioServicesCreateSystemSoundID (soundFileURLRef,&soundFileObject);

AudioServicesPlaySystemSound (soundFileObject);

[soundURL release];
}

4）最后，在同一个实现文件中（在我的项目中，该文件称为 GenericTableView.m）：

4) Finally, in the same implement file (in my project it calls "GenericTableView.m"):

- (void)dealloc {
[super dealloc];

AudioServicesDisposeSystemSoundID (soundFileObject);
//CFRelease (soundFileURLRef);
}

我必须评论 CFRelease（soundFileURLRef），因为该应用程序在以下情况下意外结束用户离开表格视图。

I must to comment "CFRelease (soundFileURLRef)" because the App ends unexpectedly when user leaves the table view.

所有这些代码均由Apple按比例分配。在此链接中，您甚至可以找到示例代码以直接在iPhone模拟器中进行测试。

All this code is proportioned by Apple. In this link you can find even a sample code to test directly in your iPhone simulator.

https://developer.apple.com/library/ios/samplecode/SysSound /Introduction/Intro.html#//apple_ref/doc/uid/DTS40008018-Intro-DontLinkElementID_2

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