音频播放器可在模拟器中工作，但不能在iOS设备上工作

Question

I have the following code initializing:

NSString *path = [NSString stringWithFormat:@"%@/test.mp3", [[NSBundle mainBundle] resourcePath]];
NSURL *soundUrl = [NSURL fileURLWithPath:path];
_audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:soundUrl error:nil];

Then a button starts the player

[_audioPlayer play];

So it works fine when I am on the simulator but it doesn't work on my device.

Answer 1

The proper way to get the path of a file in your app bundle is like this:

NSString *path = [[NSBundle mainBundle] pathForResource:@"test" ofType:@"mp3"];

But if you actually want an NSURL , use the following to get it directly:

NSURL *soundUrl = [[NSBundle mainBundle] URLForResource:@"test" withExtension:@"mp3"];

Also, the simulator isn't case sensitive but a real device is. Make sure your file is really named test.mp3 and not something like Test.mp3 . Update the name in the code to match the actual filename.

Use the debugger to make sure that soundURL isn't nil . If not but the audio player still doesn't work, use the error parameter to see why:

NSError *error = nil;
_audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:soundUrl error:&error];
if (!_audioPlayer) {
    NSLog(@"Unable to create audio player: %@", error);
}