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我有两个问题。

1- 我正在使用以下代码在我的 iphone 应用程序中添加背景音乐。

    - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
    {
        // Override point for customization after application launch.
        sleep(5);
         //this variable can be named differently

        NSString *path = [[NSBundle mainBundle] pathForResource:@"%@/background_music" ofType:@"wav"];


    // the file is stored in MyApp/SharedResources folder where as delegate is placed at MyApp/        
            backgroundSound =[[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] 

error:nil];

        backgroundSound.delegate = self;

        [backgroundSound prepareToPlay];

        [backgroundSound play];

        backgroundSound.numberOfLoops = -1;


        return YES;
    }

    @interface AppDelegate : UIResponder <UIApplicationDelegate>{
        AVAudioPlayer *backgroundSound;

    }

通过运行此代码,我的构建失败了。架构 i386 的未定义符号:

"_OBJC_CLASS_$_AVAudioPlayer", referenced from:
      objc-class-ref in AppDelegate.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)

我的第二个问题..

viewController假设我必须用一个按钮关闭另一个音乐。我怎样才能做到这一点。EG SettingsViewController

* thread #1: tid = 0x2c03, 0x90870c5a libSystem.dylib`__kill + 10, stop reason = signal SIGABRT
    frame #0: 0x90870c5a libSystem.dylib`__kill + 10
    frame #1: 0x90870c4c libSystem.dylib`kill$UNIX2003 + 32
    frame #2: 0x909035a5 libSystem.dylib`raise + 26
    frame #3: 0x909196e4 libSystem.dylib`abort + 93
    frame #4: 0x90895b1b libSystem.dylib`_Unwind_Resume + 59
    frame #5: 0x016c8e39 CoreFoundation`CFRunLoopRunSpecific + 345
    frame #6: 0x016c8ccb CoreFoundation`CFRunLoopRunInMode + 123
    frame #7: 0x0019e2a7 UIKit`-[UIApplication _run] + 576
    frame #8: 0x0019fa9b UIKit`UIApplicationMain + 1175
    frame #9: 0x00002a62 myApp`main + 130 at main.m:16
    frame #10: 0x000029d5 myApp`start + 53

最好的祝福

4

1 回答 1

2

这是一个链接器错误,您必须链接到 AVFoundation 框架。

要停止从另一个类/实例/任何地方播放,您可以有多种解决方案:

一。在要停止播放的类上声明一个属性,并将该属性设置为原始视图控制器。然后使用该属性访问该视图控制器并在其上调用一个方法来停止音乐。

二。在某些中心类中,例如您的应用程序委托或主视图控制器,添加一个 NSNotificationCenter-observer 并在整个应用程序中简单地使用通知,而不会弄乱属性。

于 2012-08-26T19:06:58.890 回答