我有一个用下面的Objective-C编写的函数，我想将它转换为Swift，但我一直收到错误。下面是Objective-C代码:-(void)openFileWithFilePathURL:(NSURL*)filePathURL{self.audioFile=[EZAudioFileaudioFileWithURL:filePathURL];self.filePathLabel.text=filePathURL.lastPathComponent;////Plotthewholewaveform//self.audioPlot.plotType=EZPlotTypeBuffer;sel