Flip UIView around any axis

Flip.swift

extension CGFloat {
    
    var toRadians: CGFloat {
        return self * CGFloat(M_PI) / 180.0
    }
    
    var toDegress: CGFloat {
        return self * 180 / CGFloat(M_PI)
    }
}

public enum Axis {
    case X
    case Y
    case Z
}

extension UIView {
    
    func flip(aroundAxis axis: Axis, byDegrees degrees: CGFloat) {
        let coordinates: (x: CGFloat, y: CGFloat, z: CGFloat) = {
            switch axis {
            case .X: return (1, 0, 0)
            case .Y: return (0, 1, 0)
            case .Z: return (0, 0, 1)
            }
        }()
        self.layer.transform = CATransform3DMakeRotation(degrees.toRadians, coordinates.x, coordinates.y, coordinates.z)
    }
}