iOS: AVAudioPlayer can it only play one file? - ios

Question

It´s only possible to give the AVAudioPlayer an URL of the file to play via it´s init method.
And as I understand it if one want´s to play another file, the old instance needs to be stopped from playing, and a new instance of AVAudioPlayer initialized with the URL to the new audiofile to play.
But this is making it hard cause I have a navigation controller, and when the user leaves the player screen the sound should keep playing, and it does. But when the user selects a new audio file to play from the tableview a new instance of the viewController and AVAudioPlayer is initalized and I have no way of stopping the old from playing. How do I get this working?

Answer 1

You can do something like this
In your v1AppDelegate.h file add,
#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
#include <AudioToolbox/AudioToolbox.h>
#interface v1AppDelegate : UIResponder <UIApplicationDelegate>
{
AVAudioPlayer *myAudioPlayer;
}
#property (nonatomic, retain) AVAudioPlayer *myAudioPlayer;
#property (strong, nonatomic) UIWindow *window;
#end
Now in your v1AppDelegate.m file add this
#import "v1AppDelegate.h"
#import <AVFoundation/AVFoundation.h>
#include <AudioToolbox/AudioToolbox.h>
#implementation v1AppDelegate
#synthesize window = _window;
#synthesize myAudioPlayer;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
//start a background sound
NSString *soundFilePath = [[NSBundle mainBundle] pathForResource:#"Startsound" ofType: #"m4a"];
NSURL *fileURL = [[NSURL alloc] initFileURLWithPath:soundFilePath ];
myAudioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:fileURL error:nil];
myAudioPlayer.numberOfLoops = -1; //infinite loop
[myAudioPlayer play];
// Override point for customization after application launch.
return YES;
}
If you wish to stop or start this music from anywhere else in your code then simply add this
#import "v1AppDelegate.h"
- (IBAction)stopMusic
{
v1AppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
[appDelegate.myAudioPlayer stop];
}
- (IBAction)startMusic
{
v1AppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
[appDelegate.myAudioPlayer play];
}