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101 lines
3.1 KiB
Swift
101 lines
3.1 KiB
Swift
import Cocoa
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/// 5 个球形波动画，由实时音频 RMS 电平驱动
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final class WaveformView: NSView {
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private let weights: [Float] = [0.5, 0.8, 1.0, 0.75, 0.55]
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private var dots: [NSView] = []
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private var smoothedLevels: [Float] = [0, 0, 0, 0, 0]
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private var decayTimer: Timer?
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private var rawLevel: Float = 0
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private let dotSize: CGFloat = 4
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private let maxExtra: CGFloat = 28
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private let spacing: CGFloat = 6
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private let silenceThreshold: Float = 0.02
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override init(frame: NSRect) {
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super.init(frame: frame)
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setupDots()
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wantsLayer = true
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}
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required init?(coder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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private func setupDots() {
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dots.forEach { $0.removeFromSuperview() }
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dots.removeAll()
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let totalWidth = CGFloat(weights.count) * dotSize + CGFloat(weights.count - 1) * spacing
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let startX = (bounds.width - totalWidth) / 2
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for (index, _) in weights.enumerated() {
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let x = startX + CGFloat(index) * (dotSize + spacing)
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let dot = NSView(frame: NSRect(x: x, y: 0, width: dotSize, height: dotSize))
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dot.wantsLayer = true
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dot.layer?.cornerRadius = dotSize / 2
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dot.layer?.backgroundColor = NSColor.white.withAlphaComponent(0.9).cgColor
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addSubview(dot)
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dots.append(dot)
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}
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decayTimer?.invalidate()
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decayTimer = Timer.scheduledTimer(withTimeInterval: 0.04, repeats: true) { [weak self] _ in
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self?.updateDecay()
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}
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}
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func updateLevel(_ level: Float) {
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rawLevel = level
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for i in 0..<weights.count {
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let target = level * weights[i]
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if target > smoothedLevels[i] {
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smoothedLevels[i] = smoothedLevels[i] * 0.55 + target * 0.45
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}
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}
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applyLevels()
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}
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private func updateDecay() {
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for i in 0..<weights.count {
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let target = rawLevel * weights[i]
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if target < smoothedLevels[i] {
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smoothedLevels[i] = smoothedLevels[i] * 0.82 + target * 0.18
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}
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if smoothedLevels[i] < silenceThreshold {
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smoothedLevels[i] = 0
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}
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}
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applyLevels()
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}
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private func applyLevels() {
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CATransaction.begin()
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CATransaction.setAnimationDuration(0.06) // 快速平滑过渡
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CATransaction.setAnimationTimingFunction(CAMediaTimingFunction(name: .easeOut))
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for (i, dot) in dots.enumerated() {
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let level = smoothedLevels[i]
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let extra = CGFloat(level) * maxExtra
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let height = dotSize + extra
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let y = (bounds.height - height) / 2
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dot.frame = NSRect(x: dot.frame.origin.x, y: y, width: dotSize, height: height)
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dot.layer?.cornerRadius = min(dotSize, height) / 2
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}
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CATransaction.commit()
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}
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override func viewDidMoveToWindow() {
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super.viewDidMoveToWindow()
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setupDots()
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}
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deinit {
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decayTimer?.invalidate()
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}
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}
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