To set customize UISlider height | Swift 4

SetCustomUISliderHeight.swift

//To set UISlider height, (which is by default not provided by UIKit framework)
//Steps:
//1. Add "CustomSlider" class in your swift file.
//2. Set "CustomSlider" class name into UISlider control from interface builder.
//3. Set "trackLineHeight" value as per requirment.

class CustomSlider: UISlider { 
  
  //Set line height value from Interface Builder,i.e. here ten is default value
  @IBInspectable var trackLineHeight: CGFloat = 10
  
  //Set custom size of track so here override trackRect function of slider control
  override func trackRect(forBounds bound: CGRect) -> CGRect {
    return CGRect(origin: bound.origin, size: CGSize(width: bound.width, height: trackLineHeight))
  }
}