What methods and approaches do you know for rounding or changing the shape of a displayed element in the interface?

To change the shape of a displayed element in iOS, you can use several approaches:

• layer.cornerRadius property — sets the corner radius of a UIView.
• Masks with UIBezierPath and CAShapeLayer — allow creating complex shapes and cutouts.
• Using clipsToBounds = true — so that content does not go outside the rounded borders.
• Automatic masks in Interface Builder — configuring corner radii and shadows.

Example of rounding the corners of a UIView:

myView.layer.cornerRadius = 10
myView.clipsToBounds = true

For more complex shapes, you can create a mask:

let path = UIBezierPath(roundedRect: myView.bounds, byRoundingCorners: [.topLeft, .topRight], cornerRadii: CGSize(width: 10, height: 10))
let mask = CAShapeLayer()
mask.path = path.cgPath
myView.layer.mask = mask