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I want to add shadow around collectionview cells. But the shadow is around the images and labels in the cell, and no shadow around the cell. Does someone know how to work it out?
cell.contentView.layer.cornerRadius = 2.0
cell.contentView.layer.borderWidth = 1.0
cell.contentView.layer.borderColor = UIColor.clear.cgColor
cell.contentView.layer.masksToBounds = true
cell.layer.masksToBounds = false
cell.layer.shadowColor = UIColor.black.cgColor
cell.layer.shadowOpacity = 0.5
cell.layer.shadowOffset = CGSize(width: -1, height: 1)
cell.layer.shadowRadius = 1
Shadow around the content(not the border)
You are applying shadow to contentView directly hence it is not working. You need to take a view inside your contentView, put all your content in this view and give some padding (e.g. 8pt) from all side.
Suppose I have named this view as vwContainer, then:
#IBOutlet weak var vwContainer: UIView!
let shadowPath = UIBezierPath(rect: vwContainer.bounds)
vwContainer.layer.masksToBounds = false
vwContainer.layer.shadowColor = UIColor.blackColor().CGColor
vwContainer.layer.shadowOffset = CGSizeMake(0.0, 5.0)
vwContainer.layer.shadowOpacity = 0.5
vwContainer.layer.shadowPath = shadowPath.CGPath
If you are trying to achieve any other UI than please update your question with image.
extension UIView {
func addShadow(color: UIColor, radius: CGFloat = 1, offset: CGSize) {
self.layoutIfNeeded()
self.layer.masksToBounds = false
self.layer.shadowColor = color.cgColor
self.layer.shadowOpacity = 0.5
self.layer.shadowOffset = offset
self.layer.shadowRadius = radius
self.layer.shadowPath = UIBezierPath(rect: self.bounds).cgPath
}
}
Use it as:
let offset = CGSize(width: -1, height: 1)
cell.addShadow(color: .black, offset: offset)
You need to set background color for the contentView as below
cell.contentView.backgroundColor = .white
I have a tableview with three rows. I am trying to make the table rows have rounded corners and also a shadow effect around the entire tableview. For some reason, I cannot make the tableview both have the rounded corners and shadow effect but I could do them separately if I comment out the code responsible for one of the features. Here is the code I am using:
//this is for shadow effect
tableView.backgroundColor = UIColor.clearColor()
tableView.layer.shadowColor = UIColor.darkGrayColor().CGColor
tableView.layer.shadowOffset = CGSize(width: 2.0, height: 2.0
tableView.layer.shadowOpacity = 1.0
tableView.layer.shadowRadius = 2
// This is for rounded corners
tableView.layer.cornerRadius = 10
tableView.layer.masksToBounds = true
You can add your table view to a container view and add drop shadow to that container view:
let containerView:UIView = UIView(frame:CGRect(x: 10, y: 100, width: 300, height: 400))
self.tableView = UITableView(frame: containerView.bounds), style: .Plain)
containerView.backgroundColor = UIColor.clearColor()
containerView.layer.shadowColor = UIColor.darkGrayColor().CGColor
containerView.layer.shadowOffset = CGSize(width: 2.0, height: 2.0)
containerView.layer.shadowOpacity = 1.0
containerView.layer.shadowRadius = 2
// This is for rounded corners
self.tableView.layer.cornerRadius = 10
self.tableView.layer.masksToBounds = true
self.view.addSubview(containerView)
containerView.addSubview(self.tableView)
Edit
Swift 3.0:
let containerView:UIView = UIView(frame:CGRect(x: 10, y: 100, width: 300, height: 400))
self.tableView = UITableView(frame: containerView.bounds, style: .plain)
containerView.backgroundColor = UIColor.clear
containerView.layer.shadowColor = UIColor.darkGray.cgColor
containerView.layer.shadowOffset = CGSize(width: 2.0, height: 2.0)
containerView.layer.shadowOpacity = 1.0
containerView.layer.shadowRadius = 2
self.tableView.layer.cornerRadius = 10
self.tableView.layer.masksToBounds = true
self.view.addSubview(containerView)
containerView.addSubview(self.tableView)
The RDC's answer is good, but for me the result didnt resolve my case, follow is my fix :
//for table view border
tableView.layer.borderColor = UIColor .grayColor().CGColor
tableView.layer.borderWidth = 1.0
//for shadow
let containerView:UIView = UIView(frame:self.tableView.frame)
//dont use clear color,fit blue color
containerView.backgroundColor = UIColor.blueColor()
//shadow view also need cornerRadius
containerView.layer.cornerRadius = 10
containerView.layer.shadowColor = UIColor.lightGrayColor().CGColor
containerView.layer.shadowOffset = CGSizeMake(-10, 10); //Left-Bottom shadow
//containerView.layer.shadowOffset = CGSizeMake(10, 10); //Right-Bottom shadow
containerView.layer.shadowOpacity = 1.0
containerView.layer.shadowRadius = 2
//for rounded corners
tableView.layer.cornerRadius = 10
tableView.layer.masksToBounds = true
self.view.addSubview(containerView)
self.view.addSubview(tableView)
i tried above solution but in my application tableview didSelectRowAt was not working.
use this Extension for UITabeleView
for corner
for shadow
//if u want shadow for all side use (shadowOffset = .zero)
extension UITableView {
func addCorner(){
self.layer.cornerRadius = 15
self.clipsToBounds = true
}
func addShadow(){
self.layer.shadowColor = UIColor.lightGray.cgColor
self.layer.shadowRadius = 5
self.layer.shadowOpacity = 0.5
self.layer.shadowOffset = .zero
self.layer.masksToBounds = false
}
}
How to use::
self.tableView.addCorner()
self.tableView.addShadow()
Thanks to #beyowulf
I have upgraded for me with Swift 2.2, to
set Border,
Rounded corner and
Drop shadow to the table view
//for table view border
tableView.layer.borderColor = UIColor .grayColor().CGColor
tableView.layer.borderWidth = 1.0
//for shadow
let containerView:UIView = UIView(frame:self.tableView.frame)
containerView.backgroundColor = UIColor.clearColor()
containerView.layer.shadowColor = UIColor.lightGrayColor().CGColor
containerView.layer.shadowOffset = CGSizeMake(-10, 10); //Left-Bottom shadow
//containerView.layer.shadowOffset = CGSizeMake(10, 10); //Right-Bottom shadow
containerView.layer.shadowOpacity = 1.0
containerView.layer.shadowRadius = 2
//for rounded corners
tableView.layer.cornerRadius = 10
tableView.layer.masksToBounds = true
self.view.addSubview(containerView)
containerView.addSubview(tableView)
result looks like
I want to show only bottom border and hide the other sides.
Output I see: As you can see I see the top, left and right borders also and they are black in color, I want to remove them. Only need the bottom white thick 2.0 border.
Code I am using (source):
var border = CALayer()
var width = CGFloat(2.0)
border.borderColor = UIColor.whiteColor().CGColor
border.frame = CGRect(x: 0, y: tv_username.frame.size.height - width, width: tv_username.frame.size.width, height: tv_username.frame.size.height)
border.borderWidth = width
tv_username.backgroundColor = UIColor.clearColor()
tv_username.layer.addSublayer(border)
tv_username.layer.masksToBounds = true
tv_username.textColor = UIColor.whiteColor()
Try to do by this way, with Swift 5.1:
var bottomLine = CALayer()
bottomLine.frame = CGRect(x: 0.0, y: myTextField.frame.height - 1, width: myTextField.frame.width, height: 1.0)
bottomLine.backgroundColor = UIColor.white.cgColor
myTextField.borderStyle = UITextField.BorderStyle.none
myTextField.layer.addSublayer(bottomLine)
You have to set the borderStyle property to None
If you are using the autolayout then set perfect constraint else bottomline will not appear.
Hope it helps.
Thought from #Ashish's answer, used same approach long ago in Objective-C but implementing extension will be more useful.
extension UITextField {
func addBottomBorder(){
let bottomLine = CALayer()
bottomLine.frame = CGRect(x: 0, y: self.frame.size.height - 1, width: self.frame.size.width, height: 1)
bottomLine.backgroundColor = UIColor.white.cgColor
borderStyle = .none
layer.addSublayer(bottomLine)
}
}
In your controller:
self.textField.addBottomBorder()
Can add further parameters to your method, like adding border height, color.
#mina-fawzy
I liked the answer that included masksToBounds by Mina Fawzy...
I ran into this issue where I was trying to style a bottom border of a UITextField, and the comments using a CGRect worked for me, however, I ran into issues when using different screen sizes, or if I changed the orientation to landscape view from the portrait.
ie. My Xcode Main.storyboard was designed with iPhone XS Max, with a UITextField constrained to be 20 points from the left/right of the screen. In my viewDidLoad() I stylized the UITextField (textfield) using the CGRect approach, making the width of the rectangle equal to textfield.frame.width.
When testing on the iPhone XS Max, everything worked perfectly, BUT, when I tested on iPhone 7 (smaller screen width) the CGRect was grabbing the width of the iPhone XS Max during the viewDidLoad(), causing the rectangle (bottom line) to be too wide, and the right edge went off the screen. Similarly, when I tested on iPad screens, the bottom line was way too short. And also, on any device, rotating to landscape view did not re-calculate the size of the rectangle needed for the bottom line.
The best solution I found was to set the width of the CGRect to larger than the longest iPad dimension (I randomly chose 2000) and THEN added textfield.layer.masksToBounds = true. This worked perfectly because now the line is plenty long from the beginning, does not need to be re-calculated ever, and is clipped to the correct width of the UITextField no matter what screen size or orientation.
Thanks Mina, and hope this helps others with the same issue!
Objective C
[txt.layer setBackgroundColor: [[UIColor whiteColor] CGColor]];
[txt.layer setBorderColor: [[UIColor grayColor] CGColor]];
[txt.layer setBorderWidth: 0.0];
[txt.layer setCornerRadius:12.0f];
[txt.layer setMasksToBounds:NO];
[txt.layer setShadowRadius:2.0f];
txt.layer.shadowColor = [[UIColor blackColor] CGColor];
txt.layer.shadowOffset = CGSizeMake(1.0f, 1.0f);
txt.layer.shadowOpacity = 1.0f;
txt.layer.shadowRadius = 1.0f;
Swift
textField.layer.backgroundColor = UIColor.whiteColor().CGColor
textField.layer.borderColor = UIColor.grayColor().CGColor
textField.layer.borderWidth = 0.0
textField.layer.cornerRadius = 5
textField.layer.masksToBounds = false
textField.layer.shadowRadius = 2.0
textField.layer.shadowColor = UIColor.blackColor().CGColor
textField.layer.shadowOffset = CGSizeMake(1.0, 1.0)
textField.layer.shadowOpacity = 1.0
textField.layer.shadowRadius = 1.0
I have tried all this answer but no one worked for me except this one
let borderWidth:CGFloat = 2.0 // what ever border width do you prefer
let bottomLine = CALayer()
bottomLine.frame = CGRectMake(0.0, Et_textfield.height - borderWidth, Et_textfield.width, Et_textfield.height )
bottomLine.backgroundColor = UIColor.blueColor().CGColor
bottomLine
Et_textfield.layer.addSublayer(bottomLine)
Et_textfield.layer.masksToBounds = true // the most important line of code
Swift 3:
Just subclass your UITextField
class BottomBorderTF: UITextField {
var bottomBorder = UIView()
override func awakeFromNib() {
//MARK: Setup Bottom-Border
self.translatesAutoresizingMaskIntoConstraints = false
bottomBorder = UIView.init(frame: CGRect(x: 0, y: 0, width: 0, height: 0))
bottomBorder.backgroundColor = UIColor.orange
bottomBorder.translatesAutoresizingMaskIntoConstraints = false
addSubview(bottomBorder)
//Mark: Setup Anchors
bottomBorder.bottomAnchor.constraint(equalTo: bottomAnchor).isActive = true
bottomBorder.leftAnchor.constraint(equalTo: leftAnchor).isActive = true
bottomBorder.rightAnchor.constraint(equalTo: rightAnchor).isActive = true
bottomBorder.heightAnchor.constraint(equalToConstant: 1).isActive = true // Set Border-Strength
}
}
Solution which using CALayer is not good because when device is rotated the underline doesn't change width.
class UnderlinedTextField: UITextField {
override func awakeFromNib() {
super.awakeFromNib()
let bottomLine = CALayer()
bottomLine.frame = CGRect(x: 0, y: self.frame.size.height, width: UIScreen.main.bounds.width, height: 1)
bottomLine.bounds = CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: self.frame.size.height)
bottomLine.backgroundColor = UIColor.black.cgColor
borderStyle = .none
layer.addSublayer(bottomLine)
layer.masksToBounds = true
}
}
The best solution is to use UIView.
class UnderlinedTextField: UITextField {
private let defaultUnderlineColor = UIColor.black
private let bottomLine = UIView()
override func awakeFromNib() {
super.awakeFromNib()
borderStyle = .none
bottomLine.translatesAutoresizingMaskIntoConstraints = false
bottomLine.backgroundColor = defaultUnderlineColor
self.addSubview(bottomLine)
bottomLine.topAnchor.constraint(equalTo: self.bottomAnchor, constant: 1).isActive = true
bottomLine.leadingAnchor.constraint(equalTo: self.leadingAnchor).isActive = true
bottomLine.trailingAnchor.constraint(equalTo: self.trailingAnchor).isActive = true
bottomLine.heightAnchor.constraint(equalToConstant: 1).isActive = true
}
public func setUnderlineColor(color: UIColor = .red) {
bottomLine.backgroundColor = color
}
public func setDefaultUnderlineColor() {
bottomLine.backgroundColor = defaultUnderlineColor
}
}
First set borderStyle property to .none.
Also, don't forget that the best time to call this method in the viewDidAppear(_:) method.
To make it handy, you can use an extension:
extension UIView {
func addBottomBorderWithColor(color: UIColor, width: CGFloat) {
let border = CALayer()
border.backgroundColor = color.cgColor
border.frame = CGRect(x: 0, y: self.frame.size.height - width,
width: self.frame.size.width, height: width)
self.layer.addSublayer(border)
}
}
Call it like:
textfield.addBottomBorderWithColor(color: UIColor.lightGray, width: 0.5)
Using extension and Swift 5.3
extension UITextField {
internal func addBottomBorder(height: CGFloat = 1.0, color: UIColor = .black) {
let borderView = UIView()
borderView.backgroundColor = color
borderView.translatesAutoresizingMaskIntoConstraints = false
addSubview(borderView)
NSLayoutConstraint.activate(
[
borderView.leadingAnchor.constraint(equalTo: leadingAnchor),
borderView.trailingAnchor.constraint(equalTo: trailingAnchor),
borderView.bottomAnchor.constraint(equalTo: bottomAnchor),
borderView.heightAnchor.constraint(equalToConstant: height)
]
)
}
}
For those looking for a solution that works for Autolayout, IBInspectable, and the Storyboard, subclass UITextField into your custom textfield class and add these:
func setUnderline() {
for sub in self.subviews {
sub.removeFromSuperview()
}
if underlineStyle == true {
var bottomBorder = UIView()
bottomBorder = UIView.init(frame: CGRect(x: 0, y: 0, width: 0, height: 0))
bottomBorder.backgroundColor = borderColor //YOUR UNDERLINE COLOR HERE
bottomBorder.translatesAutoresizingMaskIntoConstraints = false
self.addSubview(bottomBorder)
bottomBorder.bottomAnchor.constraint(equalTo: self.bottomAnchor).isActive = true
bottomBorder.leftAnchor.constraint(equalTo: self.leftAnchor).isActive = true
bottomBorder.rightAnchor.constraint(equalTo: self.rightAnchor).isActive = true
bottomBorder.heightAnchor.constraint(equalToConstant: underlineHeight).isActive = true
layoutIfNeeded()
}
}
#IBInspectable var underlineStyle: Bool = false {
didSet {
setUnderline()
}
}
#IBInspectable var underlineHeight: CGFloat = 0 {
didSet {
setUnderline()
}
}
Swift 5.
extension UITextField {
let bottomLine = UIView()
bottomLine.backgroundColor = .black
borderStyle = .none
self.addSubview(bottomLine)
NSLayoutConstraint.activate([
bottomLine.topAnchor.constraint(equalTo: bottomAnchor + 10),
bottomLine.leadingAnchor.constraint(equalTo: leadingAnchor),
bottomLine.trailingAnchor.constraint(equalTo: trailingAnchor),
bottomLine.heightAnchor.constraint(equalToConstant: 1)
])
}
For multiple Text Field
override func viewDidLoad() {
configureTextField(x: 0, y: locationField.frame.size.height-1.0, width: locationField.frame.size.width, height:1.0, textField: locationField)
configureTextField(x: 0, y: destinationField.frame.size.height-1.0, width: destinationField.frame.size.width, height:1.0, textField: destinationField)
configureTextField(x: 0, y: originField.frame.size.height-1.0, width: originField.frame.size.width, height:1.0, textField: originField)
configureTextField(x: 0, y: nameField.frame.size.height-1.0, width: nameField.frame.size.width, height:1.0, textField: nameField)
locationField.text="Hello"
super.viewDidLoad()
// Do any additional setup after loading the view.
}
func configureTextField(x:CGFloat,y:CGFloat,width:CGFloat,height:CGFloat,textField:UITextField)
{
let bottomLine = CALayer()
bottomLine.frame = CGRect(x: x, y: y, width: width, height: height)
bottomLine.backgroundColor = UIColor.white.cgColor
textField.borderStyle = UITextBorderStyle.none
textField.layer.addSublayer(bottomLine)
}
Textfield bottom border set but some more issues for devices.So bottom border not fit in textfield.I retrieve that problem the code like this
It works fine
swift 4.2
let bottomLine = CALayer()
bottomLine.frame = CGRect(x: 0.0, y: textField.frame.height - 1, width: screenSize.width - 32, height: 1.0)
bottomLine.backgroundColor = UIColor(hex: 0xD5D5D5).cgColor
textField.borderStyle = UITextField.BorderStyle.none
textField.layer.addSublayer(bottomLine)
For swift 4. this works for me.
let myfield:UITextField = {
let mf=UITextField()
let atributePlaceHolder=NSAttributedString(string: "Text_description", attributes:[NSAttributedString.Key.foregroundColor :UIColor.darkGray])
mf.textColor = .gray
mf.attributedPlaceholder=atributePlaceHolder
mf.layer.borderColor = UIColor.black.cgColor
mf.layer.backgroundColor = UIColor.white.cgColor
mf.layer.borderWidth = 0.0
mf.layer.shadowOffset = CGSize(width: 0, height: 1.0)
mf.layer.shadowOpacity = 1.0
mf.layer.shadowRadius = 0.0
return mf
}()
I do not understand how to remove a shadow that was added to a view.
I add to my view in initWithFrame a shadow in this way:
self.layer.borderWidth = 2;
self.layer.borderColor = [UIColor clearColor].CGColor;
self.backgroundColor = [UIColor greenColor];
[self.layer setCornerRadius:8.0f];
CALayer *layer = self.layer;
layer.shadowOffset = CGSizeMake(2, 2);
layer.shadowColor = [[UIColor blackColor] CGColor];
layer.cornerRadius = 8.0f;
layer.shadowRadius = 3.0f;
layer.shadowOpacity = 0.80f;
layer.shadowPath = [[UIBezierPath bezierPathWithRect:layer.bounds] CGPath];
After in the execution of the app I want to remove the shadow from this view. I've tried using:
layer.hidden = YES;
or
self.layer.hidden = YES;
but this hides the view completely, not just the added shadow.
Is there a way to retrieve the added shadow from a view and then hide it?
Thanks!
I guess you could use the shadowOpacity property of your CALayer.
So this should work:
self.layer.shadowOpacity = 0;
See the CALayer's shadowOpacity documentation page
And to show your shadow use:
self.layer.shadowOpacity = 1.0;
Sorry, not sure the correct way, but have you tried changing the properties of the layer shadow? For example, one of these;
layer.shadowOffset = CGSizeMake(0, 0);
layer.shadowColor = [[UIColor clearColor] CGColor];
layer.cornerRadius = 0.0f;
layer.shadowRadius = 0.0f;
layer.shadowOpacity = 0.00f;
Swift 4.2
I am using this in my code for labels and navigation bar.
extension UIView {
func shadow(_ height: Int = 5) {
self.layer.masksToBounds = false
self.layer.shadowRadius = 4
self.layer.shadowOpacity = 1
self.layer.shadowColor = UIColor.gray.cgColor
self.layer.shadowOffset = CGSize(width: 0 , height: height)
}
func removeShadow() {
self.layer.shadowOffset = CGSize(width: 0 , height: 0)
self.layer.shadowColor = UIColor.clear.cgColor
self.layer.cornerRadius = 0.0
self.layer.shadowRadius = 0.0
self.layer.shadowOpacity = 0.0
}
}
I tried the other answers, the only thing that worked for me was to toggle layer.masksToBounds to true/false
lazy var myView: UIView = {
let view = UIView()
view.translatesAutoresizingMaskIntoConstraints = false
view.backgroundColor = .white
view.layer.cornerRadius = 5
view.layer.shadowColor = UIColor.black.cgColor
view.layer.shadowOpacity = 3
view.layer.shadowOffset = .zero
view.layer.shadowRadius = 5
return view
}()
func showShadow() {
myView.layer.masksToBounds = false
}
func hideShadow() {
myView.layer.masksToBounds = true
}
the "layer" that you are trying to make hidden is the layer of the object that you are having a shadow to it's not a visible aspect.. only the objects with in the layer... it's rather confusing to conceptualize anyways, the only way to remove the shadow is to undo what you originally did, which was suggested above, there is no defined property that you can just toggle a bool and make the shadow go away
Swift 5.+
My solution was to add a shadowBackgroundView, which has a removable shadowLayer. In this way I could easyly remove the layer without resetting the shadow properties.
class ViewController: UIViewController {
private let shadowBackgroundView: UIView = {
let view = UIView(frame: CGRect(x: 100, y: 100, width: 100, height: 100))
view.layer.masksToBounds = false
return view
}()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
view.addSubview(shadowBackgroundView)
// the view you want to add the shadow
let dummyView = UIView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
dummyView.backgroundColor = .red
shadowBackgroundView.addSubview(dummyView)
let addShadowButton = UIButton(frame: CGRect(x: 100, y: 300, width: 140, height: 50))
addShadowButton.backgroundColor = .blue
addShadowButton.setTitle("Add Shadow", for: .normal)
addShadowButton.addTarget(self, action: #selector(addShadow), for: .touchUpInside)
let removeShadowButton = UIButton(frame: CGRect(x: 100, y: 450, width: 140, height: 50))
removeShadowButton.backgroundColor = .blue
removeShadowButton.setTitle("Remove Shadow", for: .normal)
removeShadowButton.addTarget(self, action: #selector(removeShadow), for: .touchUpInside)
view.addSubview(addShadowButton)
view.addSubview(removeShadowButton)
}
#objc
func addShadow() {
let shadowLayer = CALayer()
shadowLayer.name = "ShadowLayer"
shadowLayer.shadowColor = UIColor.black.cgColor
shadowLayer.shadowOpacity = 1
shadowLayer.shadowOffset = .zero
shadowLayer.shadowRadius = 10
shadowLayer.shadowPath = UIBezierPath(rect: shadowBackgroundView.bounds).cgPath
// Otherwise the shadow will appear above the dummyView
shadowLayer.zPosition = -1
shadowBackgroundView.layer.addSublayer(shadowLayer)
}
#objc
func removeShadow() {
// Alternatively, you could also create the shadowLayer as a property, so you could call shadowLayer.removeFromSuperLayer()
shadowBackgroundView.layer.sublayers?.first { $0.name == "ShadowLayer" }?.removeFromSuperlayer()
}
}
As a Note, for the UITableViewCell, you wouldnt need to add a shadowBackgroundView, but you could add the shadowLayer directly to cell.view.layer, which serves as the backgroundView for the cell.contentView.
Swift 4.2
Just to add to the other answers, you could change the opacity through animation:
#IBAction func btnDidTap(_ sender: UICustomGestureRecognizer) {
guard let view = sender.view else {return}
if sender.state == .began {
UIView.animate(withDuration: 0.3,
animations: {
view.layer.shadowOpacity = 0
})
} else if sender.state == .ended {
UIView.animate(withDuration: 0.3,
animations: {
view.layer.shadowOpacity = 1
})
}
}
If a add a border of a view using code in a view like
self.layer.borderColor = [UIColor yellowColor].CGColor;
self.layer.borderWidth = 2.0f;
the border is added inside the view like the following:
the right view is the original view, as you can see, the black area of bordered view is less than the original one. but what I want to get is a border outside of original view, like this:. the black area is equal to original one, how can I implement it?
Unfortunately, there isn't simply a little property you can set to align the border to the outside. It draws aligned to the inside because the UIViews default drawing operations draw within its bounds.
The simplest solution that comes to mind would be to expand the UIView by the size of the border width when applying the border:
CGFloat borderWidth = 2.0f;
self.frame = CGRectInset(self.frame, -borderWidth, -borderWidth);
self.layer.borderColor = [UIColor yellowColor].CGColor;
self.layer.borderWidth = borderWidth;
With the above accepted best answer i made experiences with such not nice results and unsightly edges:
So i will share my UIView Swift extension with you, that uses a UIBezierPath instead as border outline – without unsightly edges (inspired by #Fattie):
// UIView+BezierPathBorder.swift
import UIKit
extension UIView {
fileprivate var bezierPathIdentifier:String { return "bezierPathBorderLayer" }
fileprivate var bezierPathBorder:CAShapeLayer? {
return (self.layer.sublayers?.filter({ (layer) -> Bool in
return layer.name == self.bezierPathIdentifier && (layer as? CAShapeLayer) != nil
}) as? [CAShapeLayer])?.first
}
func bezierPathBorder(_ color:UIColor = .white, width:CGFloat = 1) {
var border = self.bezierPathBorder
let path = UIBezierPath(roundedRect: self.bounds, cornerRadius:self.layer.cornerRadius)
let mask = CAShapeLayer()
mask.path = path.cgPath
self.layer.mask = mask
if (border == nil) {
border = CAShapeLayer()
border!.name = self.bezierPathIdentifier
self.layer.addSublayer(border!)
}
border!.frame = self.bounds
let pathUsingCorrectInsetIfAny =
UIBezierPath(roundedRect: border!.bounds, cornerRadius:self.layer.cornerRadius)
border!.path = pathUsingCorrectInsetIfAny.cgPath
border!.fillColor = UIColor.clear.cgColor
border!.strokeColor = color.cgColor
border!.lineWidth = width * 2
}
func removeBezierPathBorder() {
self.layer.mask = nil
self.bezierPathBorder?.removeFromSuperlayer()
}
}
Example:
let view = UIView(frame: CGRect(x: 20, y: 20, width: 100, height: 100))
view.layer.cornerRadius = view.frame.width / 2
view.backgroundColor = .red
//add white 2 pixel border outline
view.bezierPathBorder(.white, width: 2)
//remove border outline (optional)
view.removeBezierPathBorder()
For a Swift implementation, you can add this as a UIView extension.
extension UIView {
struct Constants {
static let ExternalBorderName = "externalBorder"
}
func addExternalBorder(borderWidth: CGFloat = 2.0, borderColor: UIColor = UIColor.whiteColor()) -> CALayer {
let externalBorder = CALayer()
externalBorder.frame = CGRectMake(-borderWidth, -borderWidth, frame.size.width + 2 * borderWidth, frame.size.height + 2 * borderWidth)
externalBorder.borderColor = borderColor.CGColor
externalBorder.borderWidth = borderWidth
externalBorder.name = Constants.ExternalBorderName
layer.insertSublayer(externalBorder, atIndex: 0)
layer.masksToBounds = false
return externalBorder
}
func removeExternalBorders() {
layer.sublayers?.filter() { $0.name == Constants.ExternalBorderName }.forEach() {
$0.removeFromSuperlayer()
}
}
func removeExternalBorder(externalBorder: CALayer) {
guard externalBorder.name == Constants.ExternalBorderName else { return }
externalBorder.removeFromSuperlayer()
}
}
Ok, there already is an accepted answer but I think there is a better way to do it, you just have to had a new layer a bit larger than your view and do not mask it to the bounds of the view's layer (which actually is the default behaviour). Here is the sample code :
CALayer * externalBorder = [CALayer layer];
externalBorder.frame = CGRectMake(-1, -1, myView.frame.size.width+2, myView.frame.size.height+2);
externalBorder.borderColor = [UIColor blackColor].CGColor;
externalBorder.borderWidth = 1.0;
[myView.layer addSublayer:externalBorder];
myView.layer.masksToBounds = NO;
Of course this is if you want your border to be 1 unity large, if you want more you adapt the borderWidth and the frame of the layer accordingly.
This is better than using a second view a bit larger as a CALayer is lighter than a UIView and you don't have do modify the frame of myView, which is good for instance if myView is aUIImageView
N.B : For me the result was not perfect on simulator (the layer was not exactly at the right position so the layer was thicker on one side sometimes) but was exactly what is asked for on real device.
EDIT
Actually the problem I talk about in the N.B was just because I had reduced the screen of the simulator, on normal size there is absolutely no issue
Hope it helps
Well there is no direct method to do it
You can consider some workarounds.
Change and increase the frame and add bordercolor as you did
Add a view behind the current view with the larger size so that it appears as border.Can be worked as a custom class of view
If you dont need a definite border (clearcut border) then you can depend on shadow for the purpose
[view1 setBackgroundColor:[UIColor blackColor]];
UIColor *color = [UIColor yellowColor];
view1.layer.shadowColor = [color CGColor];
view1.layer.shadowRadius = 10.0f;
view1.layer.shadowOpacity = 1;
view1.layer.shadowOffset = CGSizeZero;
view1.layer.masksToBounds = NO;
Swift 5
extension UIView {
fileprivate struct Constants {
static let externalBorderName = "externalBorder"
}
func addExternalBorder(borderWidth: CGFloat = 2.0, borderColor: UIColor = UIColor.white) -> CALayer {
let externalBorder = CALayer()
externalBorder.frame = CGRect(x: -borderWidth, y: -borderWidth, width: frame.size.width + 2 * borderWidth, height: frame.size.height + 2 * borderWidth)
externalBorder.borderColor = borderColor.cgColor
externalBorder.borderWidth = borderWidth
externalBorder.name = Constants.ExternalBorderName
layer.insertSublayer(externalBorder, at: 0)
layer.masksToBounds = false
return externalBorder
}
func removeExternalBorders() {
layer.sublayers?.filter() { $0.name == Constants.externalBorderName }.forEach() {
$0.removeFromSuperlayer()
}
}
func removeExternalBorder(externalBorder: CALayer) {
guard externalBorder.name == Constants.externalBorderName else { return }
externalBorder.removeFromSuperlayer()
}
}
Increase the width and height of view's frame with border width before adding the border:
float borderWidth = 2.0f
CGRect frame = self.frame;
frame.width += borderWidth;
frame.height += borderWidth;
self.layer.borderColor = [UIColor yellowColor].CGColor;
self.layer.borderWidth = 2.0f;
I liked solution of #picciano
If you want exploding circle instead of square replace addExternalBorder function with:
func addExternalBorder(borderWidth: CGFloat = 2.0, borderColor: UIColor = UIColor.white) {
let externalBorder = CALayer()
externalBorder.frame = CGRect(x: -borderWidth, y: -borderWidth, width: frame.size.width + 2 * borderWidth, height: frame.size.height + 2 * borderWidth)
externalBorder.borderColor = borderColor.cgColor
externalBorder.borderWidth = borderWidth
externalBorder.cornerRadius = (frame.size.width + 2 * borderWidth) / 2
externalBorder.name = Constants.ExternalBorderName
layer.insertSublayer(externalBorder, at: 0)
layer.masksToBounds = false
}
There is actually a very simple solution. Just set them both like this:
view.layer.borderWidth = 5
view.layer.borderColor = UIColor(red: 1, green: 1, blue: 1, alpha: 0.5).cgColor
view.backgroundColor = UIColor(red: 1, green: 1, blue: 1, alpha: 0.25).cgColor
How I placed a border around my UI view (main - SubscriptionAd) in Storyboard is to place it inside another UI view (background - BackgroundAd). The Background UIView has a background colour that matches the border colour i want, and the Main UIView has constraints value 2 from each side.
I will link the background view to my ViewController and then turn the border on and off by changing the background colour.
I liked solution of #picciano & #Maksim Kniazev. We can also create annular border with following:
func addExternalAnnularBorder(borderWidth: CGFloat = 2.0, borderColor: UIColor = UIColor.white) {
let externalBorder = CALayer()
externalBorder.frame = CGRect(x: -borderWidth*2, y: -borderWidth*2, width: frame.size.width + 4 * borderWidth, height: frame.size.height + 4 * borderWidth)
externalBorder.borderColor = borderColor.cgColor
externalBorder.borderWidth = borderWidth
externalBorder.cornerRadius = (frame.size.width + 4 * borderWidth) / 2
externalBorder.name = Constants.ExternalBorderName
layer.insertSublayer(externalBorder, at: 0)
layer.masksToBounds = false
}