Errore di riferimento a AudioToolbox nell'obiettivo C

Question

Ho riscontrato il seguente errore in una semplice app Roulett in cui sto cercando di riprodurre alcuni file wav. Non sono sicuro di ciò che l'errore significa perché nessun segnali di avvertimento venire nel codice, e ho importato

Ecco l'errore:

Undefined symbols:
"_AudioServicesCreateSystemSoundID", referenced from: -[CustomPickerViewController playWinSound] in CustomPickerViewController.o -[CustomPickerViewController spin:] in CustomPickerViewController.o "_AudioServicesPlaySystemSound", referenced from: -[CustomPickerViewController playWinSound] in CustomPickerViewController.o -[CustomPickerViewController spin:] in CustomPickerViewController.o ld: symbol(s) not found collect2: ld returned 1 exit status
"_AudioServicesCreateSystemSoundID", referenced from: -[CustomPickerViewController playWinSound] in CustomPickerViewController.o -[CustomPickerViewController spin:] in CustomPickerViewController.o "_AudioServicesPlaySystemSound", referenced from: -[CustomPickerViewController playWinSound] in CustomPickerViewController.o -[CustomPickerViewController spin:] in CustomPickerViewController.o ld: symbol(s) not found collect2: ld returned 1 exit status

Ed ecco il codice:

#import "CustomPickerViewController.h" 
#import <AudioToolbox/AudioToolbox.h> 

@implementation CustomPickerViewController 
@synthesize picker; 
@synthesize winLabel; 
@synthesize column1; 
@synthesize column2; 
@synthesize column3; 
@synthesize column4; 
@synthesize column5; 
@synthesize button; 

- (void)showButton 
{ 
    button.hidden = NO; 
} 

-(void)playWinSound 
{ 
    NSString *path = [[NSBundle mainBundle] pathForResource:@"win" ofType:@"wav"]; 
    SystemSoundID soundID; 
    AudioServicesCreateSystemSoundID((CFURLRef)[NSURL fileURLWithPath:path], &soundID); 
    AudioServicesPlaySystemSound (soundID);  
    winLabel.text = @"WIN!"; 
    [self performSelector:@selector(showButton) withObject:nil afterDelay:1.5]; 
} 



-(IBAction)spin:(id)sender 
{ 
    BOOL win = NO; 
    int numInRow = 1; 
    int lastVal = -1; 
    for (int i = 0; i < 5; i++) 
    { 
     int newValue =random() % [self.column1 count]; 

     if (newValue == lastVal) 
      numInRow++; 
     else 
      numInRow = 1; 

     lastVal = newValue; 
     [picker selectRow:newValue inComponent:i animated: YES]; 
     [picker reloadComponent:i]; 
     if (numInRow >= 3) 
      win = YES; 
    } 

    button.hidden = YES; 
    NSString *path = [[NSBundle mainBundle] pathForResource:@"crunch"ofType:@"wav"]; 
    SystemSoundID soundID; 
    AudioServicesCreateSystemSoundID((CFURLRef) [NSURL fileURLWithPath:path], &soundID); 
    AudioServicesPlaySystemSound(soundID); 

    if (win) 
     [self performSelector:@selector(playWinSound) withObject: nil afterDelay: .5]; 
    else 
     [self performSelector:@selector(showButton) withObject: nil afterDelay: .5]; 

    winLabel.text = @""; 
} 

Answer 1

Trovato. Realizzato non avevo importato il Framework AudioToolbox.Framework in XCode. :)