我正在尝试从音频文件中检索采样率和channel数。我在此行遇到运行时“EXC_BREAKPOINT(code=EXC_ARM_BREAKPOINT)”错误:letaudioFormstDesc=descriptions[0]asCMAudioFormatDescription这是我使用的最简单的代码版本:importAVFoundationimportCoreMediaimportMediaPlayerclassViewController:UIViewController{overridefuncviewDidLoad(){super.viewDidLoad()letquery=M