color used to tint the appearance of the switch when it is turned on. var tintColor: UIColor! The color used to tint the outline of the switch when it is turned off. var thumbTintColor: UIColor? The color used to tint the appearance of the thumb. var onImage: UIImage? In iOS 6 and earlier, the image displayed when the switch is in the on position. var offImage: UIImage? In iOS 6 and earlier, the image displayed when the switch is in the off position. https://developer.apple.com/documentation/uikit/uiswitch TintColor͔͠ΧελϚΠζͰ͖ͳ͍