按钮无法在iOS中播放音频

Question

I uploaded a file audio.wav into my supporting files folder.

This is my PlayAudio.h

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

@interface PlayAudio : UIViewController {

}

-(IBAction) PlayIt;

@end

This is my PlayAudio.m after the implementation command

- (IBAction) PlayIt; {
    CFBundleRef mainBundle = CFBundleGetMainBundle();
    CFURLRef soundFileURLRef;
    soundFileURLRef = CFBundleCopyResourceURL(mainBundle, (CFStringRef) @"audio", CFSTR ("wav"), NULL);
    UInt32 soundID;
    AudioServicesCreateSystemSoundID(soundFileURLRef, &soundID);
    AudioServicesPlaySystemSound(soundID);

}

I then ctrl-clicked from the play button to the First Responder in my view controller and selected PlayIt. I see it's associated with Touch Up Inside.

For some reason I can click the button, but nothing plays. I'm doing this in Storyboard.

Answer 1

You can use NSURL to get the path of your wav file and cast it to CFURLRef, check the following code:

SystemSoundID soundID;
NSURL *soundPath = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"audio" ofType:@"wav"]];
if (AudioServicesCreateSystemSoundID ((CFURLRef)soundPath, &soundID) != kAudioServicesNoError) {
     AudioServicesPlayAlertSound(soundID);

}

Note, that if mute button on iphone is enable AudioServicesCreateSystemSoundID function will fail(Vibration can be used in this case:soundID = kSystemSoundID_Vibrate;). If you want to play sound disregarding the mute switch, use AVAudioPlayer api.