How to set cornerRadius for only top-left and top-right corner of a UIView?
Pay attention to the fact that if you have layout constraints attached to it, you must refresh this as follows in your UIView subclass:
override func layoutSubviews() {
super.layoutSubviews()
roundCorners(corners: [.topLeft, .topRight], radius: 3.0)
}
If you don't do that it won't show up.
And to round corners, use the extension:
extension UIView {
func roundCorners(corners: UIRectCorner, radius: CGFloat) {
let path = UIBezierPath(roundedRect: bounds, byRoundingCorners: corners, cornerRadii: CGSize(width: radius, height: radius))
let mask = CAShapeLayer()
mask.path = path.cgPath
layer.mask = mask
}
}
Additional view controller case: Whether you can't or wouldn't want to subclass a view, you can still round a view. Do it from its view controller by overriding the viewWillLayoutSubviews() function, as follows:
class MyVC: UIViewController {
/// The view to round the top-left and top-right hand corners
let theView: UIView = {
let v = UIView(frame: CGRect(x: 10, y: 10, width: 200, height: 200))
v.backgroundColor = .red
return v
}()
override func loadView() {
super.loadView()
view.addSubview(theView)
}
override func viewWillLayoutSubviews() {
super.viewWillLayoutSubviews()
// Call the roundCorners() func right there.
theView.roundCorners(corners: [.topLeft, .topRight], radius: 30)
}
}
How to set layer cornerRadius for only bottom-left, bottom-right, and top-left corner?
You just need to mask the layer as shown below:
For Swift 3:
let rectShape = CAShapeLayer()
rectShape.bounds = self.myView.frame
rectShape.position = self.myView.center
rectShape.path = UIBezierPath(roundedRect: self.myView.bounds, byRoundingCorners: [.bottomLeft , .bottomRight , .topLeft], cornerRadii: CGSize(width: 20, height: 20)).cgPath
self.myView.layer.backgroundColor = UIColor.green.cgColor
//Here I'm masking the textView's layer with rectShape layer
self.myView.layer.mask = rectShape
Lower Version:
let rectShape = CAShapeLayer()
rectShape.bounds = self.myView.frame
rectShape.position = self.myView.center
rectShape.path = UIBezierPath(roundedRect: self.myView.bounds, byRoundingCorners: .BottomLeft | .BottomRight | .TopLeft, cornerRadii: CGSize(width: 20, height: 20)).CGPath
self.myView.layer.backgroundColor = UIColor.greenColor().CGColor
//Here I'm masking the textView's layer with rectShape layer
self.myView.layer.mask = rectShape
how to set cornerRadius for only top-left corner of a UILabel?
let path = UIBezierPath(roundedRect: self.bounds, byRoundingCorners: .topLeft, cornerRadii: CGSize(width: 10.0, height: 10.0))
let maskLayer = CAShapeLayer()
maskLayer.path = path.cgPath
myText.layer.mask = maskLayer
You can also use in your UILabel class
override func draw(_ rect: CGRect) {
let path = UIBezierPath(roundedRect: self.bounds, byRoundingCorners: .topLeft, cornerRadii: CGSize(width: 10.0, height: 10.0))
let maskLayer = CAShapeLayer()
maskLayer.path = path.cgPath
self.layer.mask = maskLayer
}
How to round top two corners of UIView and add shadow above?
SWIFT 5: iOS 11 introduced maskedCorners which results in smoother and better quality results. You can still use the UIRectCorner in the function call and have it translated to CACornerMask:
extension UIView {
func roundCorners(_ corners: UIRectCorner, radius: CGFloat) {
if #available(iOS 11.0, *) {
clipsToBounds = true
layer.cornerRadius = radius
layer.maskedCorners = CACornerMask(rawValue: corners.rawValue)
} else {
let path = UIBezierPath(
roundedRect: bounds,
byRoundingCorners: corners,
cornerRadii: CGSize(width: radius, height: radius)
)
let mask = CAShapeLayer()
mask.path = path.cgPath
layer.mask = mask
}
}
func addShadow(shadowColor: CGColor = UIColor.label.cgColor,
shadowOffset: CGSize = CGSize(width: 1.0, height: 2.0),
shadowOpacity: Float = 0.4,
shadowRadius: CGFloat = 3.0) {
self.layer.shadowColor = shadowColor
self.layer.shadowOffset = shadowOffset
self.layer.shadowOpacity = shadowOpacity
self.layer.shadowRadius = shadowRadius
self.layer.masksToBounds = false
}
}
These functions need to be applied in layoutSubviews() of your superview.
override func layoutSubviews() {
roundCorners([.topLeft, .topRight], radius: 15)
addShadow(shadowColor: UIColor.text1.cgColor, shadowOffset: CGSize(width: 0, height: -3), shadowOpacity: 0.2, shadowRadius: 5)
}
How to add corner radius for UIView
You shouldn't use a mask for this, you can simply use the layer.maskedCorners property.
layer.cornerRadius = r
layer.maskedCorners = [.layerMinXMinYCorner, .layerMaxXMinYCorner]
I want to use only top border line and right and left top corners . I did it but corners colors does not appear. Can anybody help me?
class TabbarView: UIView {
var viewColor = UIView()
// Only override draw() if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
override func draw(_ rect: CGRect) {
addBorder(toSide: .Bottom, withColor:CGColor.init(gray: 100/255, alpha: 100/255), andThickness: 1)
addBorder(toSide: .Top, withColor: CGColor.init(gray: 100/255, alpha: 100/255), andThickness: 1)
addBorder(toSide: .Left, withColor: CGColor.init(gray: 100/255, alpha: 100/255), andThickness: 1)
addBorder(toSide: .Right, withColor: CGColor.init(gray: 100/255, alpha: 100/255), andThickness: 1)
self.roundCorners(view: self, corners: [.topLeft, .topRight], radius: 20)
removeBorder(toSide: .Bottom)
removeBorder(toSide: .Left)
removeBorder(toSide: .Right)
}
Round Specific Corners SwiftUI
There are two options, you can use a View with a Path, or you can create a custom Shape. In both cases you can use them standalone, or in a .background(RoundedCorders(...))
Option 1: Using Path + GeometryReader
(more info on GeometryReader: https://swiftui-lab.com/geometryreader-to-the-rescue/)
struct ContentView : View {
var body: some View {
Text("Hello World!")
.foregroundColor(.white)
.font(.largeTitle)
.padding(20)
.background(RoundedCorners(color: .blue, tl: 0, tr: 30, bl: 30, br: 0))
}
}
struct RoundedCorners: View {
var color: Color = .blue
var tl: CGFloat = 0.0
var tr: CGFloat = 0.0
var bl: CGFloat = 0.0
var br: CGFloat = 0.0
var body: some View {
GeometryReader { geometry in
Path { path in
let w = geometry.size.width
let h = geometry.size.height
// Make sure we do not exceed the size of the rectangle
let tr = min(min(self.tr, h/2), w/2)
let tl = min(min(self.tl, h/2), w/2)
let bl = min(min(self.bl, h/2), w/2)
let br = min(min(self.br, h/2), w/2)
path.move(to: CGPoint(x: w / 2.0, y: 0))
path.addLine(to: CGPoint(x: w - tr, y: 0))
path.addArc(center: CGPoint(x: w - tr, y: tr), radius: tr, startAngle: Angle(degrees: -90), endAngle: Angle(degrees: 0), clockwise: false)
path.addLine(to: CGPoint(x: w, y: h - br))
path.addArc(center: CGPoint(x: w - br, y: h - br), radius: br, startAngle: Angle(degrees: 0), endAngle: Angle(degrees: 90), clockwise: false)
path.addLine(to: CGPoint(x: bl, y: h))
path.addArc(center: CGPoint(x: bl, y: h - bl), radius: bl, startAngle: Angle(degrees: 90), endAngle: Angle(degrees: 180), clockwise: false)
path.addLine(to: CGPoint(x: 0, y: tl))
path.addArc(center: CGPoint(x: tl, y: tl), radius: tl, startAngle: Angle(degrees: 180), endAngle: Angle(degrees: 270), clockwise: false)
path.closeSubpath()
}
.fill(self.color)
}
}
}
Option 2: Custom Shape
struct ContentView : View {
var body: some View {
Text("Hello World!")
.foregroundColor(.white)
.font(.largeTitle)
.padding(20)
.background(RoundedCorners(tl: 0, tr: 30, bl: 30, br: 0).fill(Color.blue))
}
}
struct RoundedCorners: Shape {
var tl: CGFloat = 0.0
var tr: CGFloat = 0.0
var bl: CGFloat = 0.0
var br: CGFloat = 0.0
func path(in rect: CGRect) -> Path {
var path = Path()
let w = rect.size.width
let h = rect.size.height
// Make sure we do not exceed the size of the rectangle
let tr = min(min(self.tr, h/2), w/2)
let tl = min(min(self.tl, h/2), w/2)
let bl = min(min(self.bl, h/2), w/2)
let br = min(min(self.br, h/2), w/2)
path.move(to: CGPoint(x: w / 2.0, y: 0))
path.addLine(to: CGPoint(x: w - tr, y: 0))
path.addArc(center: CGPoint(x: w - tr, y: tr), radius: tr,
startAngle: Angle(degrees: -90), endAngle: Angle(degrees: 0), clockwise: false)
path.addLine(to: CGPoint(x: w, y: h - br))
path.addArc(center: CGPoint(x: w - br, y: h - br), radius: br,
startAngle: Angle(degrees: 0), endAngle: Angle(degrees: 90), clockwise: false)
path.addLine(to: CGPoint(x: bl, y: h))
path.addArc(center: CGPoint(x: bl, y: h - bl), radius: bl,
startAngle: Angle(degrees: 90), endAngle: Angle(degrees: 180), clockwise: false)
path.addLine(to: CGPoint(x: 0, y: tl))
path.addArc(center: CGPoint(x: tl, y: tl), radius: tl,
startAngle: Angle(degrees: 180), endAngle: Angle(degrees: 270), clockwise: false)
path.closeSubpath()
return path
}
}
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