iOS：如何從單身課程中引用音樂背景？

Question

我已經完成了一個叫做MyBgMusic.h的單例類，它是MyBgMusic.m。如何將該單例類引用到我的SecondViewController或XIB的其餘部分。

這裏是我的單例類：

.h文件：

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

@interface MyBgMusic : UIViewController <AVAudioPlayerDelegate> { 


    AVAudioPlayer *player; 
    UIButton *playBgMusic; 


} 

@property (nonatomic, retain) IBOutlet AVAudioPlayer *player; 
@property (nonatomic, retain) IBOutlet UIButton *playBgMusic; 


+ (id)sharedManager; 

-(IBAction) toggleMusic; 


@end 

M檔：

#import "MyBgMusic.h" 

static MyBgMusic *sharedMyManager = nil; 

@implementation MyBgMusic 

@synthesize player,playBgMusic; 

#pragma mark - 
#pragma mark Singleton Methods 

+ (MyBgMusic*)sharedManager { 

    static MyBgMusic *sharedMyManager; 
    if(!sharedMyManager) { 
     static dispatch_once_t oncePredicate; 
     dispatch_once(&oncePredicate, ^{ 
      sharedMyManager = [[super allocWithZone:nil] init]; 
      }); 
     } 

     return sharedMyManager; 
} 

+ (id)allocWithZone:(NSZone *)zone {  

    return [self sharedManager]; 
} 


- (id)copyWithZone:(NSZone *)zone { 
    return self;  
} 

#if (!__has_feature(objc_arc)) 

- (id)retain { 

    return self;  
} 

- (unsigned)retainCount { 
    return UINT_MAX; //denotes an object that cannot be released 
} 


- (id)autorelease { 

    return self;  
} 

- (void)dealloc 
{ 
    [MyBgMusic release]; 
    [playBgMusic release]; 
    [player release]; 
    [super dealloc]; 
} 
#endif 

#pragma mark - 
#pragma mark Custom Methods 

- (IBAction)toggleMusic { 

    if ([self.player isPlaying] == YES) { 
     [self.player stop]; 
    } else { 
     [self.player play]; 
    } 
    self.playBgMusic.enabled = YES; 

} 

- (void)viewDidLoad 
{ 

    NSString *path = [[NSBundle mainBundle] pathForResource:@"music" ofType:@"mp3"]; 
    self.player=[[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL]; 
    player.delegate = self; 
    [player play]; 
    player.numberOfLoops = -1; 
    [super viewDidLoad]; 

    // Do any additional setup after loading the view from its nib. 
} 

SecondViewController.m（我想從單個類引用，這樣我可以再次使用時不會弄亂背景音樂的按下和關閉。）

- (IBAction)toggleMusic{ 

    if ([self.player isPlaying] == YES) { 
     [self.player stop]; 
    } else { 
     [self.player play]; 
    } 
    self.playBgMusic.enabled = YES; 

} 

我應該聲明是這樣的：

-(IBAction) sharedMusic { 

    [[MyBgMusic sharedManager] toggleMusic]; // instance method shareManager not found. What does it mean? 

} 

Answer 1

在SecondViewController創建一個IBAction爲掛鉤的廈門國際銀行則在代碼，然後有它調用

[[MyBgMusic sharedInstance] toggleMusic]; 

Answer 2

在SecondViewController你應該在IBAction爲調用[[MyBgMusic sharedInstance] toggleMusic];當你想切換音樂。就像您使用self.player一樣。

Answer 3

你必須輸入你的類，無論你想使用此行引用它：

[[MyBgMusic sharedManager] toggleMusic] 

如果你願意，你可以添加甚至財產和引用它無需創建類的實例。