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我遇到了UIViews的奇怪行为。我有一个空的'容器'UIView - WaveformPlot，预计将填充子子视图。在addSubview期间奇怪的复制UIView
class WaveformPlot: UIView {
var normalColor: UIColor?
var progressColor: UIColor?
var waveforms: [UIView]?
override init(frame: CGRect) {
super.init(frame: frame)
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
waveforms = []
}
//MARK: Populate plot with data
func populateWithData(from dataSet: [Float]){
DispatchQueue.main.async {
var offset: CGFloat = 0
for index in 0..<dataSet.count {
let barView = UIView(frame: CGRect(x: offset,
y: self.frame.height/2,
width: self.frame.width/CGFloat(dataSet.count),
height: -(CGFloat)((dataSet[index]))))
barView.backgroundColor = self.normalColor
barView.layer.borderColor = UIColor.black.cgColor
barView.layer.borderWidth = 0.25
//Append barView to parent 'container' view
self.addSubview(barView)
//Append barView to an array for future processing
self.waveforms?.append(barView)
offset += self.frame.width/CGFloat(dataSet.count)
}
}
}
func updateColorOfBars(with currentTime: Double, of totalDuration: Double){
let percentagePlayed = currentTime/totalDuration
print("Percerntage played - \((percentagePlayed * 100)/100)")
let quantityOfBarsToBeUpdated = Double((self.waveforms?.count)!) * percentagePlayed
for item in self.waveforms!{
if (self.waveforms?.index(of: item)!)! <= Int(quantityOfBarsToBeUpdated * percentagePlayed) {
print("index processing - \(self.waveforms?.index(of: item))")
item.backgroundColor = self.progressColor
}
}
}
func clearPlot(){
for item in self.subviews{
item.removeFromSuperview()
}
}
}然后我发起这个WaveformPlot中的ViewController与 “数据”[浮点]数组64个值：
class ViewController: UIViewController {
var data: [Float] = [13, 37, 2, 3, 64, 62, 31, 50, 60, 17, 48, 56, 24, 25, 45, 8, 32, 1, 39, 26, 42, 10, 4, 27, 51, 40, 11, 12, 35, 41, 46, 21, 55, 36, 20, 14, 34, 47, 6, 9, 5, 59, 30, 54, 23, 49, 19, 0, 58, 61, 57, 28, 29, 15, 44, 16, 63, 18, 22, 43, 7, 33, 53, 38]
@IBOutlet weak var waveformView: WaveformPlot!
@IBOutlet weak var playButton: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewDidLayoutSubviews() {
waveformView.normalColor = UIColor.blue
waveformView.progressColor = UIColor.orange
waveformView.populateWithData(from: data)
}
}这导致在这 - >
但是，在可视化调试期间，我发现有128个视图，而不是64.在每个barView下还有另一个栏。 此截图的详细信息。
请帮我解决这个问题。为什么在原始的时候会附加额外的酒吧？
'viewDidLayoutSubviews'可称为不止一次。您应该在添加新视图之前删除现有视图，或者检查是否已添加新视图。 – Paulw11