iOS背景音频链接器错误

问题描述：

undefined symbols for architecture i386: 
    "_AudioSessionSetProperty", referenced from: 
    -[AppDelegate applicationDidFinishLaunching:] 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)

代码我使用：

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

    // Override point for customization after application launch. 

    // Set AudioSession 
    NSError *sessionError = nil; 
    [[AVAudioSession sharedInstance] setDelegate:self]; 
    [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord error:&sessionError]; 

    /* Pick any one of them */ 
    // 1. Overriding the output audio route 
    //UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker; 
    //AudioSessionSetProperty(kAudioSessionProperty_OverrideAudioRoute, sizeof(audioRouteOverride), &audioRouteOverride); 

    // 2. Changing the default output audio route 
    UInt32 doChangeDefaultRoute = 1; 
    AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryDefaultToSpeaker, sizeof(doChangeDefaultRoute), &doChangeDefaultRoute); 

    [self.window addSubview:rootController.view]; 
    [self.window makeKeyAndVisible]; 

    return YES; 
}

（从https://devforums.apple.com/thread/90684?start=0&tstart=0和this app was developed and works fine under ios 5.0, but crashes under ios 4.3和How do I get my AVPlayer to play while app is in background?）

终于我的plist：

enter image description here 问题是什么？在我的appdelegate的标题中：

#import <UIKit/UIKit.h> 
#import <AVFoundation/AVFoundation.h> 
#import <AudioToolbox/AudioToolbox.h> 

@interface AppDelegate : UIResponder <UIApplicationDelegate, AVAudioPlayerDelegate> { 

}

似乎是一切都导入。我做错了什么？

您是否将AudioToolbox添加到应用程序中？是，然后再删除并再次删除通过在框架上右键单击添加AudioToolbox和AVFoundation框架到您的项目 - >添加 - >现有框架 – iSpark 2013-03-16 10:42:39

是的，我相信我没有 – stackOverFlew 2013-03-16 10:50:00

它还在吗？ – iSpark 2013-03-16 10:51:08

答

这是我得到了它在后台播放音频：

// Allow to play in background 
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil]; 
[[AVAudioSession sharedInstance] setActive:YES error:nil];

也是这个固定的上述错误：

通过右键Cliking添加AudioToolbox和AVFoundation框架到您的项目在框架 - >添加 - >现有框架

iOS背景音频链接器错误

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