Blur

You can use UIBlurEffect with next properties:

leftViewBackgroundBlurEffect: UIBlurEffect
rightViewBackgroundBlurEffect: UIBlurEffect

rootViewCoverBlurEffectForLeftView: UIBlurEffect
rootViewCoverBlurEffectForRightView: UIBlurEffect

leftViewCoverBlurEffect: UIBlurEffect
rightViewCoverBlurEffect: UIBlurEffect

For example:

sideMenuController.leftViewBackgroundBlurEffect = UIBlurEffect(style: .regular)

If you want to change color of blurred view, use:

leftViewBackgroundColor: UIColor
rightViewBackgroundColor: UIColor

rootViewCoverColorForLeftView: UIColor
rootViewCoverColorForRightView: UIColor

leftViewCoverColor: UIColor
rightViewCoverColor: UIColor

For example:

sideMenuController.leftViewBackgroundColor = UIColor(red: 0.0, green: 0.5, blue: 1.0, alpha: 0.1)

If you want to change intensity of blurred view, use:

leftViewBackgroundAlpha: CGFloat
rightViewBackgroundAlpha: CGFloat

rootViewCoverAlphaForLeftView: CGFloat
rootViewCoverAlphaForRightView: CGFloat

CGFloatleftViewCoverAlpha: CGFloat
rightViewCoverAlpha: CGFloat

For example:

sideMenuController.leftViewBackgroundAlpha = 0.9