使用 NSObject 中的 AVAudioPlayer 播放音频 class

Question

为了组织事情，我决定创建一个名为 SoundPlayer 的 class，其中运行来自我的应用程序的所有音频文件。（这样可以避免有很多重复代码）

SoundPlayer.h

#import <Foundation/Foundation.h>
#import <AVFoundation/AVFoundation.h>
#include <AudioToolbox/AudioToolbox.h>

@interface SoundPlayer : NSObject <AVAudioPlayerDelegate>

@property (strong,nonatomic) AVAudioPlayer *backgroundMusicPlayer;

-(void)PlaySound:(NSString*)name extension:(NSString*)ext loops:(int)val;

@end

SoundPlayer.m

#import "SoundPlayer.h"

@implementation SoundPlayer

-(void)PlaySound:(NSString *)name extension:(NSString *)ext loops:(int)val{

    NSString *soundFilePath = [[NSBundle mainBundle] pathForResource:name ofType:ext];
    NSURL *soundPath = [[NSURL alloc] initFileURLWithPath:soundFilePath];
    NSError *error;
    self.backgroundMusicPlayer = [[AVAudioPlayer alloc]
                                  initWithContentsOfURL:soundPath error:&error];
    self.backgroundMusicPlayer.numberOfLoops = val;
    [self.backgroundMusicPlayer prepareToPlay];
    [self.backgroundMusicPlayer play];
}

@end

这段代码非常简单，而且效果很好。当用户第一次打开我的应用程序时，我想播放声音，为此我在 didFinishLaunchingWithOptions 中调用 class，像这样：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{

    SoundPlayer *sound = [[SoundPlayer alloc] init];
    [sound PlaySound:@"preview" extension:@"mp3" loops:0];

    return YES;//Diz que o retorno esta ok!
}

问题是声音没有被执行（现在，如果我复制 SoundPlayer class 中的所有代码并放入 class 我会用，声音运行完美）有什么问题吗？

Answer 1

您的 SoundPlayer class 超出范围并被释放，这使声音静音。

将其分配给应用委托中的成员变量：

self.sound = [[SoundPlayer alloc] init];
[sound PlaySound:@"preview" extension:@"mp3" loops:0];

Answer 2

试试这个：

AppDelegate.h

 #import <UIKit/UIKit.h>
 #import "SoundPlayer.h"

 @interface AppDelegate : UIResponder <UIApplicationDelegate>
   @property (strong, nonatomic) UIWindow *window;
   @property(strong,nonatomic) SoundPlayer * soundPlayer;
@end

AppDelegate.m

#import "AppDelegate.h"
#import "SoundPlayer.h"

@interface AppDelegate ()

@end

@implementation AppDelegate


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    self.soundPlayer = [[SoundPlayer alloc] init];
    [self.soundPlayer PlaySound:@"preview" extension:@"mp3" loops:0];
    return YES;
}

使用 NSObject 中的 AVAudioPlayer 播放音频 class

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