Make UISlider height larger?

The accepted answer will undesirably change the slider's width in some cases, like if you're using a minimumValueImage and maximumValueImage. If you only want to change the height and leave everything else alone, then use this code:

override func trackRect(forBounds bounds: CGRect) -> CGRect {   var newBounds = super.trackRect(forBounds: bounds)   newBounds.size.height = 12   return newBounds}

Here's my recent swifty implementation, building on CularBytes's ...

open class CustomSlider : UISlider {    @IBInspectable open var trackWidth:CGFloat = 2 {        didSet {setNeedsDisplay()}    }    override open func trackRect(forBounds bounds: CGRect) -> CGRect {        let defaultBounds = super.trackRect(forBounds: bounds)        return CGRect(            x: defaultBounds.origin.x,            y: defaultBounds.origin.y + defaultBounds.size.height/2 - trackWidth/2,            width: defaultBounds.size.width,            height: trackWidth        )    }}

Use this on a UISlider in a storyboard by setting its custom class

The IBInspectable allows you to set the height from the storyboard

For those that would like to see some working code for changing the track size.

class CustomUISlider : UISlider {    override func trackRect(forBounds bounds: CGRect) -> CGRect {        //keeps original origin and width, changes height, you get the idea        let customBounds = CGRect(origin: bounds.origin, size: CGSize(width: bounds.size.width, height: 5.0))        super.trackRect(forBounds: customBounds)        return customBounds    }    //while we are here, why not change the image here as well? (bonus material)    override func awakeFromNib() {        self.setThumbImage(UIImage(named: "customThumb"), for: .normal)        super.awakeFromNib()    }}

Only thing left is changing the class inside the storyboard:

You can keep using your seekbar action and outlet to the object type UISlider, unless you want to add some more custom stuff to your slider.