UIBezierPath: How to add a border around a view with rounded corners? - swift

Question

I am using UIBezierPath to have my imageview have round corners but I also want to add a border to the imageview. Keep in mind the top is a uiimage and the bottom is a label.
Currently using this code produces:
let rectShape = CAShapeLayer()
rectShape.bounds = myCell2.NewFeedImageView.frame
rectShape.position = myCell2.NewFeedImageView.center
rectShape.path = UIBezierPath(roundedRect: myCell2.NewFeedImageView.bounds,
byRoundingCorners: .TopRight | .TopLeft,
cornerRadii: CGSize(width: 25, height: 25)).CGPath
myCell2.NewFeedImageView.layer.mask = rectShape
I want to add a green border to that but I cant use
myCell2.NewFeedImageView.layer.borderWidth = 8
myCell2.NewFeedImageView.layer.borderColor = UIColor.greenColor().CGColor
because it cuts off the top left and top right corner of the border as seen in this image:
Is there a way too add in a border with UIBezierPath along with my current code?

Answer 1

You can reuse the UIBezierPath path and add a shape layer to the view. Here is an example inside a view controller.
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Create a view with red background for demonstration
let v = UIView(frame: CGRectMake(0, 0, 100, 100))
v.center = view.center
v.backgroundColor = UIColor.redColor()
view.addSubview(v)
// Add rounded corners
let maskLayer = CAShapeLayer()
maskLayer.frame = v.bounds
maskLayer.path = UIBezierPath(roundedRect: v.bounds, byRoundingCorners: .TopRight | .TopLeft, cornerRadii: CGSize(width: 25, height: 25)).CGPath
v.layer.mask = maskLayer
// Add border
let borderLayer = CAShapeLayer()
borderLayer.path = maskLayer.path // Reuse the Bezier path
borderLayer.fillColor = UIColor.clearColor().CGColor
borderLayer.strokeColor = UIColor.greenColor().CGColor
borderLayer.lineWidth = 5
borderLayer.frame = v.bounds
v.layer.addSublayer(borderLayer)
}
}
The end result looks like this.
Note that this only works as expected when the view's size is fixed. When the view can resize, you will need to create a custom view class and resize the layers in layoutSubviews.

Answer 2

As it says above:
It is not easy to do this perfectly.
Here's a drop-in solution.
This
correctly addresses the issue that you are drawing HALF OF THE BORDER LINE
is totally usable in autolayout
completely re-works itself when the size of the view changes or animates
is totally IBDesignable - you can see it in realtime in your storyboard
for 2019 ...
#IBDesignable
class RoundedCornersAndTrueBorder: UIView {
#IBInspectable var cornerRadius: CGFloat = 10 {
didSet { setup() }
}
#IBInspectable var borderColor: UIColor = UIColor.black {
didSet { setup() }
}
#IBInspectable var trueBorderWidth: CGFloat = 2.0 {
didSet { setup() }
}
override func layoutSubviews() {
setup()
}
var border:CAShapeLayer? = nil
func setup() {
// make a path with round corners
let path = UIBezierPath(
roundedRect: self.bounds, cornerRadius:cornerRadius)
// note that it is >exactly< the size of the whole view
// mask the whole view to that shape
// note that you will ALSO be masking the border we'll draw below
let mask = CAShapeLayer()
mask.path = path.cgPath
self.layer.mask = mask
// add another layer, which will be the border as such
if (border == nil) {
border = CAShapeLayer()
self.layer.addSublayer(border!)
}
// IN SOME APPROACHES YOU would INSET THE FRAME
// of the border-drawing layer by the width of the border
// border.frame = bounds.insetBy(dx: borderWidth, dy: borderWidth)
// so that when you draw the line, ALL of the WIDTH of the line
// DOES fall within the actual mask.
// here, we will draw the border-line LITERALLY ON THE EDGE
// of the path. that means >HALF< THE LINE will be INSIDE
// the path and HALF THE LINE WILL BE OUTSIDE the path
border!.frame = bounds
let pathUsingCorrectInsetIfAny =
UIBezierPath(roundedRect: border!.bounds, cornerRadius:cornerRadius)
border!.path = pathUsingCorrectInsetIfAny.cgPath
border!.fillColor = UIColor.clear.cgColor
// the following is not what you want:
// it results in "half-missing corners"
// (note however, sometimes you do use this approach):
//border.borderColor = borderColor.cgColor
//border.borderWidth = borderWidth
// this approach will indeed be "inside" the path:
border!.strokeColor = borderColor.cgColor
border!.lineWidth = trueBorderWidth * 2.0
// HALF THE LINE will be INSIDE the path and HALF THE LINE
// WILL BE OUTSIDE the path. so MAKE IT >>TWICE AS THICK<<
// as requested by the consumer class.
}
}
So that's it.
Beginner help for the question in the comments ...
Make a "new Swift file" called "Fattie.swift". (Note, funnily enough it actually makes no difference what you call it. If you are at the stage of "don't know how to make a new file" seek basic Xcode tutorials.)
Put all of the above code in the file
You've just added a class "RoundedCornersAndTrueBorder" to your project.
On your story board. Add an ordinary UIView to your scene. In fact, make it actually any size/shape whatsoever, anything you prefer.
Look at the Identity Inspector. (If you do not know what that is, seek basic tutorials.) Simply change the class to "RoundedCornersAndTrueBorder". (Once you start typing "Roun...", it will guess which class you mean.
You're done - run the project.
Note that you have to, of course, add complete and correct constraints to the UIView, just as with absolutely anything you do in Xcode. Enjoy!
Similar solutions:
https://stackoverflow.com/a/57465440/294884 - image + rounded + shadows
https://stackoverflow.com/a/41553784/294884 - two-corner problem
https://stackoverflow.com/a/59092828/294884 - "shadows + hole" or "glowbox" problem
https://stackoverflow.com/a/57400842/294884 - the "border AND gap" problem
https://stackoverflow.com/a/57514286/294884 - basic "adding" beziers
And please also see the alternate answer below! :)

Answer 3

Absolutely perfect 2019 solution
Without further ado, here's exactly how you do this.
Don't actually use the "basic" layer that comes with the view
Make a new layer only for the image. You can now mask this (circularly) without affecting the next layer
Make a new layer for the border as such. It will safely not be masked by the picture layer.
The key facts are
With a CALayer, you can indeed apply a .mask and it only affects that layer
When drawing a circle (or indeed any border), have to attend very carefully to the fact that you only get "half the width" - in short never crop using the same path you draw with.
Notice the original cat image is exactly as wide as the horizontal yellow arrow. You have to be careful to paint the image so that the whole image appears in the roundel, which is smaller than the overall custom control.
So, setup in the usual way
import UIKit
#IBDesignable class GreenCirclePerson: UIView {
#IBInspectable var borderColor: UIColor = UIColor.black { didSet { setup() } }
#IBInspectable var trueBorderThickness: CGFloat = 2.0 { didSet { setup() } }
#IBInspectable var trueGapThickness: CGFloat = 2.0 { didSet { setup() } }
#IBInspectable var picture: UIImage? = nil { didSet { setup() } }
override func layoutSubviews() { setup() }
var imageLayer: CALayer? = nil
var border: CAShapeLayer? = nil
func setup() {
if (imageLayer == nil) {
imageLayer = CALayer()
self.layer.addSublayer(imageLayer!)
}
if (border == nil) {
border = CAShapeLayer()
self.layer.addSublayer(border!)
}
Now carefully make the layer for the circularly-cropped image:
// the ultimate size of our custom control:
let box = self.bounds.aspectFit()
let totalInsetOnAnyOneSide = trueBorderThickness + trueGapThickness
let boxInWhichImageSits = box.inset(by:
UIEdgeInsets(top: totalInsetOnAnyOneSide, left: totalInsetOnAnyOneSide,
bottom: totalInsetOnAnyOneSide, right: totalInsetOnAnyOneSide))
// just a note. that version of inset#by is much clearer than the
// confusing dx/dy variant, so best to use that one
imageLayer!.frame = boxInWhichImageSits
imageLayer!.contents = picture?.cgImage
imageLayer?.contentsGravity = .resizeAspectFill
let halfImageSize = boxInWhichImageSits.width / 2.0
let maskPath = UIBezierPath(roundedRect: imageLayer!.bounds,
cornerRadius:halfImageSize)
let maskLayer = CAShapeLayer()
maskLayer.path = maskPath.cgPath
imageLayer!.mask = maskLayer
Next as a completely separate layer, draw the border as you wish:
// now create the border
border!.frame = bounds
// To draw the border, you must inset it by half the width of the border,
// otherwise you'll be drawing only half the border. (Indeed, as an additional
// subtle problem you are clipping rather than rendering the outside edge.)
let halfWidth = trueBorderThickness / 2.0
let borderCenterlineBox = box.inset(by:
UIEdgeInsets(top: halfWidth, left: halfWidth,
bottom: halfWidth, right: halfWidth))
let halfBorderBoxSize = borderCenterlineBox.width / 2.0
let borderPath = UIBezierPath(roundedRect: borderCenterlineBox,
cornerRadius:halfBorderBoxSize)
border!.path = borderPath.cgPath
border!.fillColor = UIColor.clear.cgColor
border!.strokeColor = borderColor.cgColor
border!.lineWidth = trueBorderThickness
}
}
Everything works perfectly as in iOS standard controls:
Everything which is invisible is invisible; you can see-through the overall custom control to any material behind, there are no "half thickness" problems or missing image material, you can set the custom control background color in the usual way, etc etc. The inspector controls all work properly. (Phew!)
Similar solutions:
https://stackoverflow.com/a/57465440/294884 - image + rounded + shadows
https://stackoverflow.com/a/41553784/294884 - two-corner problem
https://stackoverflow.com/a/59092828/294884 - "shadows + hole" or "glowbox" problem
https://stackoverflow.com/a/57400842/294884 - the "border AND gap" problem
https://stackoverflow.com/a/57514286/294884 - basic "adding" beziers

Answer 4

**use this extension for round borders and corner**
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
}
func roundCornersWithBorder(corners: UIRectCorner, radius: CGFloat) {
let maskLayer = CAShapeLayer()
maskLayer.frame = bounds
maskLayer.path = UIBezierPath(roundedRect: bounds, byRoundingCorners: [.topLeft, .topRight], cornerRadii: CGSize(width: radius, height: radius)).cgPath
layer.mask = maskLayer
// Add border
let borderLayer = CAShapeLayer()
borderLayer.path = maskLayer.path // Reuse the Bezier path
borderLayer.fillColor = UIColor.clear.cgColor
borderLayer.strokeColor = UIColor(red:3/255, green:33/255, blue:70/255, alpha: 0.15).cgColor
borderLayer.lineWidth = 2
borderLayer.frame = bounds
layer.addSublayer(borderLayer)
}
}
Use like this
myView.roundCornersWithBorder(corners: [.topLeft, .topRight], radius: 8.0)
myView.roundCorners(corners: [.topLeft, .topRight], radius: 8.0)

Answer 5

There sure is! Every view has a layer property (which you know from giving your layer rounded corners). Another two properties on layer are borderColor and borderWidth. Just by setting those you can add a border to your view! (The border will follow the rounded corners.) Be sure to use UIColor.CGColor for borderColor as a plain UIColor won't match the type.