在UIView中用AudioKit绘制样本文件波形

import AudioKit

class WaveformView: UIView {
    var audioFile: AKAudioFile?
    var waveformColor: UIColor = .blue
    
    override func draw(_ rect: CGRect) {
        guard let audioFile = audioFile else { return }
        
        let path = UIBezierPath()
        path.lineWidth = 1.0
        waveformColor.setStroke()
        
        let samplesPerPixel = Int(audioFile.samplesCount) / Int(rect.width)
        let halfHeight = rect.height / 2
        
        for i in 0..<Int(rect.width) {
            let sampleIndex = i * samplesPerPixel
            let sample = audioFile.samples[sampleIndex]
            let x = CGFloat(i)
            let y = CGFloat(sample) * halfHeight + halfHeight
            
            if i == 0 {
                path.move(to: CGPoint(x: x, y: y))
            } else {
                path.addLine(to: CGPoint(x: x, y: y))
            }
        }
        
        path.stroke()
    }
    
    func loadAudioFile(url: URL) {
        do {
            audioFile = try AKAudioFile(forReading: url)
            setNeedsDisplay()
        } catch {
            print("Failed to load audio file: \(error)")
        }
    }
}

let waveformView = WaveformView(frame: CGRect(x: 0, y: 0, width: 200, height: 100))
waveformView.waveformColor = .red
waveformView.loadAudioFile(url: audioURL)