AVAudioPlayer阻止和iOS 5問題

Question

我目前正在從遠程服務器上下載.mp3文件，一旦文件加載，我將它存儲在Caches目錄中。然後，我創建AVAudioPlayer實例和數據加載到它：

- (void)playAudio:(NSString *)path 
{ 
    NSLog(@"start playing audio at path %@", path); 
    NSError *error = nil; 
    NSData *audioData = [NSData dataWithContentsOfFile:path]; 
    _audioPlayer = [[AVAudioPlayer alloc] initWithData:audioData error:&error]; 
    if (error == nil) 
    { 
     [_audioPlayer play];  
    } 
} 

在這個文件開始播放，一些動畫也發生的時間。如果我允許AVAudioPlayer開始播放，它似乎會阻止用戶界面，動畫會被凍結，直到歌曲播放一兩秒鐘。這是在模擬器上，FYI。我想知道是否與AVAudio在開始播放時吐出的（可能的）錯誤/日誌有關？有什麼方法可以在不影響用戶界面/動畫的情況下播放音頻文件？

如果我將[_audioPlayer play]註釋掉，動畫運行正常，所以問題似乎不在initWithData：call中。

以下是iOS 5的問題未登錄的狀態，以及：

2012-01-05 14:32:27.427 Lovebind[53526:207] Error loading /System/Library/Extensions/AudioIPCDriver.kext/Contents/Resources/AudioIPCPlugIn.bundle/Contents/MacOS/AudioIPCPlugIn: dlopen(/System/Library/Extensions/AudioIPCDriver.kext/Contents/Resources/AudioIPCPlugIn.bundle/Contents/MacOS/AudioIPCPlugIn, 262): Symbol not found: _CFXMLNodeGetInfoPtr 
    Referenced from: /System/Library/Frameworks/Security.framework/Versions/A/Security 
    Expected in: /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation 
in /System/Library/Frameworks/Security.framework/Versions/A/Security 
2012-01-05 14:32:27.433 Lovebind[53526:207] Error loading /System/Library/Extensions/AudioIPCDriver.kext/Contents/Resources/AudioIPCPlugIn.bundle/Contents/MacOS/AudioIPCPlugIn: dlopen(/System/Library/Extensions/AudioIPCDriver.kext/Contents/Resources/AudioIPCPlugIn.bundle/Contents/MacOS/AudioIPCPlugIn, 262): Symbol not found: _CFXMLNodeGetInfoPtr 
    Referenced from: /System/Library/Frameworks/Security.framework/Versions/A/Security 
    Expected in: /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation 
in /System/Library/Frameworks/Security.framework/Versions/A/Security 
2012-01-05 14:32:27.556 Lovebind[53526:207] Error loading /System/Library/Extensions/AppleHDA.kext/Contents/PlugIns/AppleHDAHALPlugIn.bundle/Contents/MacOS/AppleHDAHALPlugIn: dlopen(/System/Library/Extensions/AppleHDA.kext/Contents/PlugIns/AppleHDAHALPlugIn.bundle/Contents/MacOS/AppleHDAHALPlugIn, 262): Symbol not found: _CFXMLNodeGetInfoPtr 
    Referenced from: /System/Library/Frameworks/Security.framework/Versions/A/Security 
    Expected in: /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation 
in /System/Library/Frameworks/Security.framework/Versions/A/Security 
2012-01-05 14:32:27.562 Lovebind[53526:207] Error loading /System/Library/Extensions/AppleHDA.kext/Contents/PlugIns/AppleHDAHALPlugIn.bundle/Contents/MacOS/AppleHDAHALPlugIn: dlopen(/System/Library/Extensions/AppleHDA.kext/Contents/PlugIns/AppleHDAHALPlugIn.bundle/Contents/MacOS/AppleHDAHALPlugIn, 262): Symbol not found: _CFXMLNodeGetInfoPtr 
    Referenced from: /System/Library/Frameworks/Security.framework/Versions/A/Security 
    Expected in: /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation 
in /System/Library/Frameworks/Security.framework/Versions/A/Security 
2012-01-05 14:32:27.572 Lovebind[53526:207] Error loading /System/Library/Extensions/AppleHDA.kext/Contents/PlugIns/AppleHDAHALPlugIn.bundle/Contents/MacOS/AppleHDAHALPlugIn: dlopen(/System/Library/Extensions/AppleHDA.kext/Contents/PlugIns/AppleHDAHALPlugIn.bundle/Contents/MacOS/AppleHDAHALPlugIn, 262): Symbol not found: _CFXMLNodeGetInfoPtr 
    Referenced from: /System/Library/Frameworks/Security.framework/Versions/A/Security 
    Expected in: /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation 
in /System/Library/Frameworks/Security.framework/Versions/A/Security 
2012-01-05 14:32:27.578 Lovebind[53526:207] Error loading /System/Library/Extensions/AppleHDA.kext/Contents/PlugIns/AppleHDAHALPlugIn.bundle/Contents/MacOS/AppleHDAHALPlugIn: dlopen(/System/Library/Extensions/AppleHDA.kext/Contents/PlugIns/AppleHDAHALPlugIn.bundle/Contents/MacOS/AppleHDAHALPlugIn, 262): Symbol not found: _CFXMLNodeGetInfoPtr 
    Referenced from: /System/Library/Frameworks/Security.framework/Versions/A/Security 
    Expected in: /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation 
in /System/Library/Frameworks/Security.framework/Versions/A/Security 
2012-01-05 14:32:27.589 Lovebind[53526:207] Error loading /System/Library/Extensions/AppleHDA.kext/Contents/PlugIns/AppleHDAHALPlugIn.bundle/Contents/MacOS/AppleHDAHALPlugIn: dlopen(/System/Library/Extensions/AppleHDA.kext/Contents/PlugIns/AppleHDAHALPlugIn.bundle/Contents/MacOS/AppleHDAHALPlugIn, 262): Symbol not found: _CFXMLNodeGetInfoPtr 
    Referenced from: /System/Library/Frameworks/Security.framework/Versions/A/Security 
    Expected in: /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation 
in /System/Library/Frameworks/Security.framework/Versions/A/Security 
2012-01-05 14:32:27.595 Lovebind[53526:207] Error loading /System/Library/Extensions/AppleHDA.kext/Contents/PlugIns/AppleHDAHALPlugIn.bundle/Contents/MacOS/AppleHDAHALPlugIn: dlopen(/System/Library/Extensions/AppleHDA.kext/Contents/PlugIns/AppleHDAHALPlugIn.bundle/Contents/MacOS/AppleHDAHALPlugIn, 262): Symbol not found: _CFXMLNodeGetInfoPtr 
    Referenced from: /System/Library/Frameworks/Security.framework/Versions/A/Security 
    Expected in: /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation 
in /System/Library/Frameworks/Security.framework/Versions/A/Security 

Answer 1

其實，我要把我的意見（現已刪除）到官方的回答：

1）你的 「錯誤加載」 線當您將CoreFoundation.framework添加到您的項目時應該消失。

和

2）發揮你的聲音在一個單獨的線程，我懷疑你的阻塞問題會自行消失。

做到這一點最簡單的方法就是做：

- (void)playingAudioOnSeparateThread: (NSString *) path 
{ 
    if(_audioPlayer) 
    { 
     [_audioPlayer release]; 
     _audioPlayer = nil; // doing this while a sound is playing might crash... 
    } 

    NSLog(@"start playing audio at path %@", path); 
    NSError *error = nil; 
    NSData *audioData = [NSData dataWithContentsOfFile:path]; 
    _audioPlayer = [[AVAudioPlayer alloc] initWithData:audioData error:&error]; 
    if (error == nil) 
    { 
     [_audioPlayer play];  
    } 
} 

- (void)playAudio:(NSString *)path 
{ 
    [NSThread detachNewThreadSelector: @selector(playingAudioOnSeparateThread:) toTarget: self withObject: path]; 
} 

我不檢查此代碼爲健全或錯誤檢查。這是你的工作。 :-)