ios - radius - Añadiendo sombra interior a la parte superior de UIView

uiview shadow swift 4

Question

Miré hacia arriba, pero no pude encontrar cómo puedo agregar una sombra interior a UIView, solo arriba (de arriba a abajo) para Swift. ¿Cuál es la mejor manera de agregar círculo interior en Swift?

Edición: he encontrado algunas preguntas y respuestas en SO, sin embargo, o están en obj-c o se ven tan complicadas. Estaba buscando una forma más Swifty, si hay alguna

Lo que quiero lograr:

Answer 1

Actualicé la respuesta de @NRitH e hice una extensión también modificada para que pueda manipular múltiples bordes de una sola vez

uso

myview.addShadow(to: [.top,.bottom], radius: 15.0)

extension UIView{
func addShadow(to edges:[UIRectEdge], radius:CGFloat){
let toColor = UIColor(colorLiteralRed: 235.0/255.0, green: 235.0/255.0, blue: 235.0/255.0, alpha: 1.0)
let fromColor = UIColor(colorLiteralRed: 188.0/255.0, green: 188.0/255.0, blue: 188.0/255.0, alpha: 1.0)
// Set up its frame.
let viewFrame = self.frame
for edge in edges{
let gradientlayer = CAGradientLayer()
gradientlayer.colors = [fromColor.cgColor,toColor.cgColor]
gradientlayer.shadowRadius = radius
switch edge {
case UIRectEdge.top:
gradientlayer.startPoint = CGPoint(x: 0.5, y: 0.0)
gradientlayer.endPoint = CGPoint(x: 0.5, y: 1.0)
gradientlayer.frame = CGRect(x: 0.0, y: 0.0, width: viewFrame.width, height: gradientlayer.shadowRadius)
case UIRectEdge.bottom:
gradientlayer.startPoint = CGPoint(x: 0.5, y: 1.0)
gradientlayer.endPoint = CGPoint(x: 0.5, y: 0.0)
gradientlayer.frame = CGRect(x: 0.0, y: viewFrame.height - gradientlayer.shadowRadius, width: viewFrame.width, height: gradientlayer.shadowRadius)
case UIRectEdge.left:
gradientlayer.startPoint = CGPoint(x: 0.0, y: 0.5)
gradientlayer.endPoint = CGPoint(x: 1.0, y: 0.5)
gradientlayer.frame = CGRect(x: 0.0, y: 0.0, width: gradientlayer.shadowRadius, height: viewFrame.height)
case UIRectEdge.right:
gradientlayer.startPoint = CGPoint(x: 1.0, y: 0.5)
gradientlayer.endPoint = CGPoint(x: 0.0, y: 0.5)
gradientlayer.frame = CGRect(x: viewFrame.width - gradientlayer.shadowRadius, y: 0.0, width: gradientlayer.shadowRadius, height: viewFrame.height)
default:
break
}
self.layer.addSublayer(gradientlayer)
}
}
func removeAllSublayers(){
if let sublayers = self.layer.sublayers, !sublayers.isEmpty{
for sublayer in sublayers{
sublayer.removeFromSuperlayer()
}
}
}
}

Answer 2

Ajusté la modificación realizada por @ anoop4real usando clear como toColor e hice la interfaz más en línea con la configuración de la sombra en CALayer, incluidos los valores predeterminados, con la excepción de la opacidad, que se establece en 0.0 de forma predeterminada. Fui con un valor predeterminado de 0.6 ya que se veía más natural.

extension UIView {
func addShadow(to edges: [UIRectEdge], radius: CGFloat = 3.0, opacity: Float = 0.6, color: CGColor = UIColor.black.cgColor) {
let fromColor = color
let toColor = UIColor.clear.cgColor
let viewFrame = self.frame
for edge in edges {
let gradientLayer = CAGradientLayer()
gradientLayer.colors = [fromColor, toColor]
gradientLayer.opacity = opacity
switch edge {
case .top:
gradientLayer.startPoint = CGPoint(x: 0.5, y: 0.0)
gradientLayer.endPoint = CGPoint(x: 0.5, y: 1.0)
gradientLayer.frame = CGRect(x: 0.0, y: 0.0, width: viewFrame.width, height: radius)
case .bottom:
gradientLayer.startPoint = CGPoint(x: 0.5, y: 1.0)
gradientLayer.endPoint = CGPoint(x: 0.5, y: 0.0)
gradientLayer.frame = CGRect(x: 0.0, y: viewFrame.height - radius, width: viewFrame.width, height: radius)
case .left:
gradientLayer.startPoint = CGPoint(x: 0.0, y: 0.5)
gradientLayer.endPoint = CGPoint(x: 1.0, y: 0.5)
gradientLayer.frame = CGRect(x: 0.0, y: 0.0, width: radius, height: viewFrame.height)
case .right:
gradientLayer.startPoint = CGPoint(x: 1.0, y: 0.5)
gradientLayer.endPoint = CGPoint(x: 0.0, y: 0.5)
gradientLayer.frame = CGRect(x: viewFrame.width - radius, y: 0.0, width: radius, height: viewFrame.height)
default:
break
}
self.layer.addSublayer(gradientLayer)
}
}
func removeAllShadows() {
if let sublayers = self.layer.sublayers, !sublayers.isEmpty {
for sublayer in sublayers {
sublayer.removeFromSuperlayer()
}
}
}
}

La vista superior es la configuración predeterminada, y la parte inferior utiliza un radio de 5.0 para mostrar más claramente.

view1.addShadow([.top, .bottom, .left, .right])
view2.addShadow([.top, .bottom, .left, .right], radius: 5.0)
view2.backgroundColor = .orange

Answer 3

Aquí hay una versión Swift pura que yo preparé:

public class EdgeShadowLayer: CAGradientLayer {
public enum Edge {
case Top
case Left
case Bottom
case Right
}
public init(forView view: UIView,
edge: Edge = Edge.Top,
shadowRadius radius: CGFloat = 20.0,
toColor: UIColor = UIColor.white,
fromColor: UIColor = UIColor.black) {
super.init()
self.colors = [fromColor.cgColor, toColor.cgColor]
self.shadowRadius = radius
let viewFrame = view.frame
switch edge {
case .Top:
startPoint = CGPoint(x: 0.5, y: 0.0)
endPoint = CGPoint(x: 0.5, y: 1.0)
self.frame = CGRect(x: 0.0, y: 0.0, width: viewFrame.width, height: shadowRadius)
case .Bottom:
startPoint = CGPoint(x: 0.5, y: 1.0)
endPoint = CGPoint(x: 0.5, y: 0.0)
self.frame = CGRect(x: 0.0, y: viewFrame.height - shadowRadius, width: viewFrame.width, height: shadowRadius)
case .Left:
startPoint = CGPoint(x: 0.0, y: 0.5)
endPoint = CGPoint(x: 1.0, y: 0.5)
self.frame = CGRect(x: 0.0, y: 0.0, width: shadowRadius, height: viewFrame.height)
case .Right:
startPoint = CGPoint(x: 1.0, y: 0.5)
endPoint = CGPoint(x: 0.0, y: 0.5)
self.frame = CGRect(x: viewFrame.width - shadowRadius, y: 0.0, width: shadowRadius, height: viewFrame.height)
}
}
required public init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}

Para usarlo,

let topShadow = EdgeShadowLayer(forView: targetView, edge: .Top)
targetView.layer.addSublayer(topShadow)

Tenga en cuenta que el valor predeterminado es un degradado de negro a blanco que tiene 20 puntos de profundidad.

El código completo, con un UIViewController muestra que le permite alternar las sombras en las cuatro esquinas de una vista, se puede encontrar en https://github.com/jrtibbetts/Tenebrae . También he documentado el EdgeShadowLayer bastante a fondo.

Answer 4

Así es como agregué una sombra interior en una vista.

func addInerShadowLayer()
{
clipsToBounds = true
let shapeLayer = CAShapeLayer()
let path = UIBezierPath(roundedRect: CGRect(x: -10, y: -self.frame.height/2, width: self.frame.width + 20, height: self.frame.height*2), cornerRadius: 0)
let buttonPath = UIBezierPath(roundedRect: CGRect(x: -1, y: -1, width: self.frame.width+2, height: self.frame.height+2), cornerRadius: self.frame.height/2)
path.append(buttonPath.reversing())
shapeLayer.path = path.cgPath
self.layer.addSublayer(shapeLayer)
shapeLayer.shadowOpacity = 0.1
shapeLayer.shadowColor = UIColor.red.cgColor
shapeLayer.shadowOffset = CGSize(width: 0, height: 4)
shapeLayer.shadowRadius = 3
}

Answer 5

Reescribí la solución @NRitH en Swift 3, también lo refactoré ligeramente:

final class SideShadowLayer: CAGradientLayer {
enum Side {
case top,
bottom,
left,
right
}
init(frame: CGRect, side: Side, shadowWidth: CGFloat,
fromColor: UIColor = .black,
toColor: UIColor = UIColor(red: 0, green: 0, blue: 0, alpha: 0),
opacity: Float = 0.5) {
super.init()
colors = [fromColor.cgColor, toColor.cgColor]
self.opacity = opacity
switch side {
case .bottom:
startPoint = CGPoint(x: 0.5, y: 1.0)
endPoint = CGPoint(x: 0.5, y: 0.0)
self.frame = CGRect(x: 0, y: frame.height - shadowWidth, width: frame.width, height: shadowWidth)
case .top:
startPoint = CGPoint(x: 0.5, y: 0.0)
endPoint = CGPoint(x: 0.5, y: 1.0)
self.frame = CGRect(x: 0, y: 0, width: frame.width, height: shadowWidth)
case .left:
startPoint = CGPoint(x: 0.0, y: 0.5)
endPoint = CGPoint(x: 1.0, y: 0.5)
self.frame = CGRect(x: 0, y: 0, width: shadowWidth, height: frame.height)
case .right:
startPoint = CGPoint(x: 1.0, y: 0.5)
endPoint = CGPoint(x: 0.0, y: 0.5)
self.frame = CGRect(x: frame.width - shadowWidth, y: 0, width: shadowWidth, height: frame.height)
}
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
}
}

Answer 6

Usé la sombra interna del implemento para UIView usando Objective-C. Intento traducir el código a swift. Por favor, perdóname por mi pobre sintaxis rápida.

puede llamar a la siguiente función en UIView.didMoveToSuperview

func drawShadow() {
if nil == self.shadowLayer {
let size = self.frame.size
self.clipsToBounds = true
let layer: CALayer = CALayer()
layer.backgroundColor = UIColor.lightGrayColor().CGColor
layer.position = CGPointMake(size.width / 2, -size.height / 2 + 0.5)
layer.bounds = CGRectMake(0, 0, size.width, size.height)
layer.shadowColor = UIColor.darkGrayColor().CGColor
layer.shadowOffset = CGSizeMake(0.5, 0.5)
layer.shadowOpacity = 0.8
layer.shadowRadius = 5.0
self.shadowLayer = layer
self.layer.addSublayer(layer)
}
}