Question

我做了一个名为MyBgMusic.h的单例类＆amp; MyBgMusic.m。如何将单例类引用到我的SecondViewController或XIB的其余部分。

这是我的单身人士课程：

H档：

#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档案：

#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（我想从单例类中引用，以便我可以重新使用它，而不会在按下和关闭时弄乱背景音乐。）

- (IBAction)toggleMusic{

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

}

我应该这样声明：

-(IBAction) sharedMusic {

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

}

Answer 1

在SecondViewController中创建一个IBAction，然后在代码中挂起xib，然后调用

[[MyBgMusic sharedInstance] toggleMusic];

Answer 2

在SecondViewController中，当你想要切换音乐时，你应该在IBAction中调用[[MyBgMusic sharedInstance] toggleMusic];。就像你使用self.player一样。

Answer 3

您必须导入您的班级并使用此行在任何地方引用它：

[[MyBgMusic sharedManager] toggleMusic]

如果需要，您可以添加偶数属性并引用它，而无需创建类的实例。

iOS：如何从单例类中引用音乐背景？

3 个答案: