请确保在xCode中包含AudioToolbox库.我遇到了同样的错误，因为文件已导入但未将库链接到项目.

Be sure to include the AudioToolbox lib in xCode. I had the same error because the files were imported but did not link the library to the project.

这应该摆脱您的错误.

祝你有美好的一天！