ios - 在 ios 中使用 AVAudioSession 时出错

Question

我用过这些代码

- (void)viewDidLoad
{
[[AVAudioSession sharedInstance] setDelegate: self];
[[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategoryAmbient error: nil];
AudioSessionAddPropertyListener (
                                 kAudioSessionProperty_AudioRouteChange,
                                 audioRouteChangeListenerCallback,
                                 self
                                 );
NSError *activationError = nil;
[[AVAudioSession sharedInstance] setActive: YES error: &activationError];
}

和

void audioRouteChangeListenerCallback (void *inUserData, AudioSessionPropertyID inPropertyID, UInt32 inPropertyValueSize, const void *inPropertyValue ) {
    // ensure that this callback was invoked for a route change
    if (inPropertyID != kAudioSessionProperty_AudioRouteChange) return;


    {
        // Determines the reason for the route change, to ensure that it is not
        //      because of a category change.
        CFDictionaryRef routeChangeDictionary = (CFDictionaryRef)inPropertyValue;

        CFNumberRef routeChangeReasonRef = (CFNumberRef)CFDictionaryGetValue (routeChangeDictionary, CFSTR (kAudioSession_AudioRouteChangeKey_Reason) );
        SInt32 routeChangeReason;
        CFNumberGetValue (routeChangeReasonRef, kCFNumberSInt32Type, &routeChangeReason);

        if (routeChangeReason == kAudioSessionRouteChangeReason_OldDeviceUnavailable) {

            //Handle Headset Unplugged
        } else if (routeChangeReason == kAudioSessionRouteChangeReason_NewDeviceAvailable) {
            //Handle Headset plugged in
        }

    }
}

在我的项目中检测音频插孔是否插入或拔出，​​但我最终遇到了这个错误

Undefined symbols for architecture armv7:
  "_AVAudioSessionCategoryAmbient", referenced from:
      -[ViewController viewDidLoad] in ViewController.o
  "_OBJC_CLASS_$_AVAudioSession", referenced from:
      objc-class-ref in ViewController.o
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)

那么这里面有什么问题呢？我是 ios 的初学者，我们将不胜感激。

Answer 1

您没有将 AudioToolBox.Frameworks 添加到项目文件中。仔细检查您的项目文件设置..

更新实际上错过了在项目构建阶段添加的 AVFoundation.Frameworks。

更新 2
尾随的 s 已被删除。现在是 AudioToolBox.Framework 和 AVFoundation.Framework