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我試圖複製你在音樂應用程序中流行的外觀，你會看到一系列的聲吧上下移動到音樂節拍。我的問題是，我無法讓我的音吧保持其底部邊界固定在屏幕底部，並調整其高度。我的縮放算法是正確的，並且效果很好，但是我的問題是我的條形音棒在屏幕上下移動，而不是粘到底部而只是調整高度。這是我的。Swift：Anchor SKSpriteNode
func setUpSoundBars(){
//I have this as a skspritenode because i need to adjust its Z position
//"SoundBars" is just a red background image sized to the iphone6 plus
soundbar = SKSpriteNode(imageNamed: "SoundBars")
self.addChild(soundbar!)
}
//updateBeatParticle() is being called constantly by CADisplayLink
func updateBeatParticle(){
//Algorithm to get scale according to music
//DO NOT WORRY ABOUT Below
//-------------------------------------------------------
if let audio = backgroundMusic?.backgroundAudio {
var scale: CGFloat = 0
if (audio.playing) { // Only do this if the audio is actually playing
audio.updateMeters() // Tell the audio player to update and fetch the latest readings
let channels = audio.numberOfChannels
var power: Float = 0
//Loop over each channel and add its average power
for i in 0..<channels {
power += audio.averagePowerForChannel(i)
}
power /= Float(channels) // This will give the average power across all the channels in decibels
// Convert power in decibels to a more appropriate percentage representation
scale = CGFloat(getIntensityFromPower(power))
scale -= 0.6
if scale < 0 {
scale = 0
}
scale *= 2
}
//----------------------------------------------------
//DO NOT WORRY ABOUT ABOVE
//This is where sound bar is adjusted to the and its size is changed
//to match the beat of the music
//WHERE I NEED HELP!
if let view = self.view {
let height: CGFloat = view.frame.height * scale
soundbar?.position = CGPoint(x: 0, y: view.frame.height - height)
soundbar?.size = CGSize(width: (self.view?.bounds.width)! * 0.20, height: height)
}
}
}