在iPhone上播放音频文件

Question

I've made a simple app, where I have a list of songs. The user taps a list entry and the song begins playing.

I've lifted the SoundEffect class from Apple's sample projects (eg Metronome, BubbleLevel). It seems to work fine with the following code:

// declare in the .h file
SoundEffect *audio;

// setup - when controller loads
audio = [SoundEffect alloc];

// play when user taps entry
NSBundle *mainBundle = [NSBundle mainBundle];   
[audio initWithContentsOfFile:[mainBundle pathForResource:@"entry1" ofType:@"mp3"]];
[audio play];

However, if the 'audio' object is already playing, I'd like to stop it before it starts playing the sound again. SoundEffect class does not have a stop method or I am simply missing something.

How do i stop the audio before playing it again?

Answer 1

您为什么不简单地使用AVAudioPlayer ？

Answer 2

The SoundEffect class is a wrapper around the C-based System Sounds API (see the .m file from the Bubble Level project), which is a simple "fire and forget" style API that doesn't provide a "stop" function. More info in the System Sounds Services Reference .

I also agree with (and have voted up) zoul's suggestion to use AVAudioPlayer . System Sounds are wholly inappropriate for long, encoded audio files like songs in MP3 files.