開啓/關閉全球聲音在cocos2d應用

Question

我已經使用一個單獨的類，並使用在所有類別中打開應用聲音開/關。問題是當我改變屏幕時，即使它靜音，聲音也會打開。我在每節課的初始化中都會調用sound方法，因此它會打開。但是如果我不從init調用它永遠不會啓動。我很亂。

以下是我所使用

//SingletonClass.m 
+(SingletonClass*)sharedMySingleton 
{ 
..... 
} 
+(id)alloc{ 
...... 
} 

-(id)init{ 
    self = [super init]; 
     if (self != nil) { 
      // initialize stuff here 
      is_sound_enable = TRUE; 
    //   [[SimpleAudioEngine sharedEngine] setMute:NO]; 
      [[SimpleAudioEngine sharedEngine] resumeBackgroundMusic]; 
      }    
     return self; 
} 

-(void)setsound{ 
    if(is_sound_enable == TRUE){ 
//  [[SimpleAudioEngine sharedEngine] setMute:NO]; //this is not working when called again 
     [[SimpleAudioEngine sharedEngine] resumeBackgroundMusic]; 
//  is_sound_enable = FALSE; 
    } 
    else{ 
//  [[SimpleAudioEngine sharedEngine] setMute:YES]; // this is not working when called again 
     [[SimpleAudioEngine sharedEngine] pauseBackgroundMusic]; 
//  is_sound_enable = TRUE; 
    } 

    if(is_sound_enable == TRUE){ 
     is_sound_enable = FALSE; 
    } 
    else{ 
     is_sound_enable = TRUE; 
    } 
} 


//MyClass.m 
-(void)toggleSoound{ 
[[SingletonClass sharedMySingleton] setsound]; 
} 

Answer 1

創建SingletonClass.h文件如下

#import <Foundation/Foundation.h> 
#import "AVFoundation/AVFoundation.h" 

@interface SingletonClass : NSObject 
{ 
    BOOL is_sound_enable; 
    AVAudioPlayer *audioPlayer; 
} 

@property (nonatomic,assign) BOOL is_sound_enable; 
@property (nonatomic,retain) AVAudioPlayer *audioPlayer; 

+ (SingletonClass *)sharedInstance; 
-(void)checkAndPlayMusic; 
-(void)loadNewFile:(NSURL*)newFileURL; 

@end 

創建SingletonClass.m文件如下

#import "SingletonClass.h" 

@implementation SingletonClass 

@synthesize is_sound_enable; 
@synthesize audioPlayer; 

#pragma mark - 
#pragma mark Singleton Variables 
static SingletonClass *singletonHelper = nil; 

#pragma mark - 
#pragma mark Singleton Methods 
- (id)init { 
    if ((self = [super init])) { 
     is_sound_enable = YES; 
     NSString *strPath = @""; //<-- Assign path here 
     NSURL *url = [NSURL URLWithString:strPath]; 
     audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil]; 
     [audioPlayer prepareToPlay]; 
     audioPlayer.numberOfLoops = -1; //<-- This will set it to infinite playing. 
    } 

    return self; 
} 
+ (SingletonClass *)sharedInstance { 
    @synchronized(self) { 
     if (singletonHelper == nil) { 
      [[self alloc] init]; // assignment not done here 
     } 
    } 
    return singletonHelper; 
} 
+ (id)allocWithZone:(NSZone *)zone { 
    @synchronized(self) { 
     if (singletonHelper == nil) { 
      singletonHelper = [super allocWithZone:zone]; 
      // assignment and return on first allocation 
      return singletonHelper; 
     } 
    } 
    // on subsequent allocation attempts return nil 
    return nil; 
} 
- (id)copyWithZone:(NSZone *)zone { 
    return self; 
} 
- (id)retain { 
    return self; 
} 
- (unsigned)retainCount { 
    return UINT_MAX; // denotes an object that cannot be released 
} 
//- (void)release { 
- (void)dealloc { 
    [audioPlayer release]; 
    [super dealloc]; 
} 
- (id)autorelease { 
    return self; 
} 

-(void)resumeBackgroundMusic 
{ 
    //Your code 
    NSLog(@"Playing music"); 
    [self.audioPlayer play]; 
} 

-(void)pauseBackgroundMusic 
{ 
    //Your code here 
    NSLog(@"Paused music"); 
    [self.audioPlayer pause]; 
} 

-(void)checkAndPlayMusic 
{ 
    if(self.is_sound_enable) 
     [self resumeBackgroundMusic]; 
    else 
     [self pauseBackgroundMusic]; 
} 

//Added this new method to load new music file. 
-(void)loadNewFile:(NSURL*)newFileURL 
{ 
    if(self.audioPlayer) 
     [self.audioPlayer release]; 

    audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:newFileURL error:nil]; 
    [audioPlayer prepareToPlay]; 
    audioPlayer.numberOfLoops = -1; 
} 


@end 

現在，你有什麼要做的是

SingletonClass *sgHelper = [SingletonClass sharedInstance]; 
sgHelper.is_sound_enable = NO; //<--Set here NO or YES according to your requirement and music will be played accordingly. 
[sgHelper checkAndPlayMusic]; 

讓我知道如果u需要進一步的幫助。