iOS:如何从单例类中引用音乐背景?

问题描述

我已经完成了一个名为MyBgMusic.h& MyBgMusic.m.如何将该单例类引用到我的SecondViewController或XIB的其余部分.

I have done a singleton class called MyBgMusic.h & MyBgMusic.m. How to reference that singleton class to my SecondViewController or the rest of the XIB.

这是我的单例课程:

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文件:

#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(我想从单例类中进行引用，以便可以再次使用它，而不必在打开和关闭时弄乱背景音乐.)

SecondViewController.m ( I want to reference from the singleton class so that I can use it all over again without mess up the background music when pressing on and off. )

- (IBAction)toggleMusic{

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

}

我应该这样声明吗:

-(IBAction) sharedMusic {

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

}

推荐答案

您必须导入您的类，并在希望使用此行的任何位置引用它:

You have to import your class and reference it wherever you want using this line :

[[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.

If you want, you can add even property and reference it without create an instance of your class.

这篇关于iOS:如何从单例类中引用音乐背景?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！