pointer loop to integer conversion? - objective-c

Question

The code is suppose to make a sound either yes or yes 3 play when clicked, but I get an error before I begin to debug that says rand cannot be statically allocated, but I can't put a * there because it's an integer. I am getting a conversion error when I do that. I also tried putting a * before sound, and that solved the error issue but when the button is clicked it wont play anything. So what do I do?
#import "ViewController.h"
#import <AVFoundation/AVAudioPlayer.h>
#interface ViewController ()
#end
#implementation
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}//this is where the error breakpoint is that you show me how to make
- (IBAction)Yes {
NSInteger rand = arc4random_uniform(2);
NSString sound = rand == 0 ? #"yes" : #"yes 3";
NSURL *url = [[NSBundle mainBundle] URLForResource:sound withExtension:#"mp3"];
AVAudioPlayer* audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
[audioPlayer play];
}
#end

Answer 1

I've seen this many times before, and it has to do with the fact that your audio player variable is being released before it has a chance to play the file.
You need to create a property for the audio player in your header:
#property (nonatomic, strong) AVAudioPlayer *audioPlayer;
Then in your method access that property instead of the local variable:
- (IBAction)YES {
NSInteger rand = arc4random_uniform(2);
NSString *sound = rand == 0 ? #"yes" : #"yes 3";
NSURL *url = [[NSBundle mainBundle] URLForResource:sound withExtension:#"mp3"];
self.audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
[self.audioPlayer play];
}
Note that this has absolutely nothing to do with the sound variable you're messing with. You should be using the * to indicate a pointer when creating that variable, as shown above.