App crashing on playing a sound on button click method - iphone

Question

I used uibuttons to create a grid view, now need to select and deselect the button on its click.
All is working fine but when I try to play a sound on a button click, app get crashed by printing the below message in console:
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIButton prepareToPlay]: unrecognized selector sent to instance 0x7526a20'
To play the sound,I have taken the object of AVAudioPlayer claas in .h file and initializing it in view did load method and playing it on button click, here is my code
.h file
#import <UIKit/UIKit.h>
#import <AVFoundation/AVAudioPlayer.h>
#import <AudioUnit/AudioUnit.h>
#interface PlayViewController : UIViewController<AVAudioPlayerDelegate>
{
IBOutlet UIButton *resetBtn;
UIButton *btn[25];
AVAudioPlayer *tapSound;
}
-(IBAction)reserBtnClkd;
#property(nonatomic,retain) AVAudioPlayer *tapSound;
#end
in .m file
- (void)viewDidLoad
{
[super viewDidLoad];
[self.view setBackgroundColor:[UIColor colorWithPatternImage:[UIImage imageNamed:#"background.png"]]];
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
NSString *path=[[NSBundle mainBundle] pathForResource:#"button-3" ofType:#"wav"];
AVAudioPlayer *Tapsound=[[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL];
self.tapSound=Tapsound;
[Tapsound release];
[pool release];
[self setTheIcons];
resetBtn.layer.cornerRadius=6.0;
resetBtn.backgroundColor=[UIColor colorWithRed:90/255.00 green:33.00/255.00 blue:179.00/255.00 alpha:1];
resetBtn.titleLabel.font=[UIFont fontWithName:#"Helvetica" size:22];
[resetBtn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
}
#pragma mark
#pragma mark<Creating The Grid View Of Icons>
#pragma mark
-(void) setTheIcons
{
int x=11;
int y=55;
for(int i=1;i<=25;i++)
{
btn[i]=[UIButton buttonWithType:UIButtonTypeCustom];
btn[i].frame=CGRectMake(x, y, 58,58);
[btn[i] addTarget:self action:#selector(btnClkd:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn[i]];
if(i%5==0)
{
x=11;
y=y+60;
}
else
{
x=x+60;
}
}
[self reserBtnClkd];
}
-(void)btnClkd:(UIButton*)sender
{
sender.selected=!sender.selected;
if(sender.selected)
{
// UIView *tempView=[[UIView alloc]initWithFrame:CGRectMake(12, 12, 34, 34)];
UIView *tempView=[[UIView alloc]initWithFrame:CGRectMake(0, 0, 58, 58)];
tempView.backgroundColor=[UIColor colorWithPatternImage:[UIImage imageNamed:#"hover-effectNew.png"]];
tempView.userInteractionEnabled=NO;
[sender addSubview:tempView];
[tempView release];
}
else
{
NSArray *subviewToRemove=[sender subviews];
int i=1;
for(UIView *view in subviewToRemove)
{
if(i==2)
{
[view removeFromSuperview];
}
i++;
}
}
[self.tapSound prepareToPlay];
[self.tapSound setDelegate:self];
[self.tapSound play];
}
And the strange thing is that App crashed only when I play the sound on button click method, otherwise if I play it in view did load then it works without any issue, Scratching my head for two days but could not find any solution, please help me

Answer 1

I think that the problem is that your self.tapSound is an UIButton(you can see it in the crash log: '-[UIButton prepareToPlay]: unrecognized selector sent to instance 0x7526a20'.
Try debugging it step by step and see what happens

Answer 2

I think because self.tapSoundis referencing Tapsound, when you call [Tapsound release] it releases the property as well. I would recommend instantiating the property directly, like this:
/*note that you have declared tapSound in your .h
as a class variable in addition to being a property.
This means you can access it as both.
Wherever you would type self.tapSound, instead use simply tapSound
*/
tapSound = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL];