Custom UISlider inner bar corner radius issue iOS 14

You can use if let

override func layoutSubviews() {
    if let arrSubLayer = layer.sublayers, arrSubLayer.count > 1 {
      arrSubLayer[1].cornerRadius = 12
    self.thumbTintColor = .clear

It will check for the sub layers. If any then it will check the count > 1 as you are trying to trying to access index 1.

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