I'm having a funny issue working on my first tvOS application (actually my first iOS application in general since years).
What I want to achieve is to have a custom zoom and shadow for the cells of my UICollectionView when they are selected.
The weird thing is I'm able to see the zoom effect and the shadow for the cells, but when these are at both sides of the collection, the shadow is not rendered.
Let me show you the issue with few images.
This is the correct result I'd like to achieve and it works fine for "internal" cells: bigger shadow + zoom (scale).
This is the wrong result I'm getting for "external" cells: zoom (scale) is ok, but the shadow is not updated. This is also valid for the other "external" cell on the right side of the collection.
Further funny thing is, if I do not scale the cells, then the shadow is correctly update:
This is the code of my custom UICollectionViewCell:
import UIKit
class MyCloudCollectionViewCell: UICollectionViewCell {
var selectTrans: UIFocusAnimationCoordinator?
var scale : CGFloat = 0.0
override func layoutSubviews() {
super.layoutSubviews()
self.clipsToBounds = false
self.layer.masksToBounds = false
self.layer.shadowOpacity = 0.20;
self.layer.shadowRadius = 4.0;
self.layer.shadowOffset = CGSize(width: 1, height: 6);
self.scale = 1.0
}
override func didUpdateFocus(in context: UIFocusUpdateContext, with coordinator: UIFocusAnimationCoordinator) {
coordinator.addCoordinatedAnimations({
super.didUpdateFocus(in: context, with: coordinator)
if self.isFocused {
self.layer.shadowOpacity = 0.25;
self.layer.shadowRadius = 4.0;
self.layer.shadowOffset = CGSize(width: 1, height: 18);
self.scale = 1.19
let transform = CGAffineTransform(scaleX: self.scale, y: self.scale)
self.layer.setAffineTransform(transform)
} else {
self.layer.shadowOpacity = 0.20;
self.layer.shadowRadius = 4.0;
self.layer.shadowOffset = CGSize(width: 1, height: 6);
self.scale = 1.0
let transform = CGAffineTransform(scaleX: self.scale, y: self.scale)
self.layer.setAffineTransform(transform)
}
}, completion: nil)
}
}
Collection also have these settings:
self.collectionView?.clipsToBounds = false
self.collectionView?.layer.masksToBounds = false
The problem is that the base view cell is not the right place to perform that kind of operation.
Try to use a custom container view instead of the base view cell.
Related
I am trying to build a UIView that has a few UIImageViews arranged in a circular, overlapping manner (see image below). Let's say we have N images. Drawing out the first N - 1 is easy, just use sin/cos functions to arrange the centers of the UIImageViews around a circle. The problem is with the last image that seemingly has two z-index values! I know this is possible since kik messenger has similar group profile photos.
The best idea I have come up so far is taking the last image, split into something like "top half" and "bottom half" and assign different z-values for each. This seems doable when the image is the left-most one, but what happens if the image is the top most? In this case, I would need to split left and right instead of top and bottom.
Because of this problem, it's probably not top, left, or right, but more like a split across some imaginary axis from the center of the overall facepile through the center of the UIImageView. How would I do that?!
Below Code Will Layout UIImageView's in Circle
You would need to import SDWebImage and provide some image URLs to run the code below.
import Foundation
import UIKit
import SDWebImage
class EventDetailsFacepileView: UIView {
static let dimension: CGFloat = 66.0
static let radius: CGFloat = dimension / 1.68
private var profilePicViews: [UIImageView] = []
var profilePicURLs: [URL] = [] {
didSet {
updateView()
}
}
func updateView() {
self.profilePicViews = profilePicURLs.map({ (profilePic) -> UIImageView in
let imageView = UIImageView()
imageView.sd_setImage(with: profilePic)
imageView.roundImage(imageDimension: EventDetailsFacepileView.dimension, showsBorder: true)
imageView.sd_imageTransition = .fade
return imageView
})
self.profilePicViews.forEach { (imageView) in
self.addSubview(imageView)
}
self.setNeedsLayout()
self.layer.borderColor = UIColor.green.cgColor
self.layer.borderWidth = 2
}
override func layoutSubviews() {
super.layoutSubviews()
let xOffset: CGFloat = 0
let yOffset: CGFloat = 0
let center = CGPoint(x: self.bounds.size.width / 2, y: self.bounds.size.height / 2)
let radius: CGFloat = EventDetailsFacepileView.radius
let angleStep: CGFloat = 2 * CGFloat(Double.pi) / CGFloat(profilePicViews.count)
var count = 0
for profilePicView in profilePicViews {
let xPos = center.x + CGFloat(cosf(Float(angleStep) * Float(count))) * (radius - xOffset)
let yPos = center.y + CGFloat(sinf(Float(angleStep) * Float(count))) * (radius - yOffset)
profilePicView.frame = CGRect(origin: CGPoint(x: xPos, y: yPos),
size: CGSize(width: EventDetailsFacepileView.dimension, height: EventDetailsFacepileView.dimension))
count += 1
}
}
override func sizeThatFits(_ size: CGSize) -> CGSize {
let requiredSize = EventDetailsFacepileView.dimension + EventDetailsFacepileView.radius
return CGSize(width: requiredSize,
height: requiredSize)
}
}
I don't think you'll have much success trying to split images to get over/under z-indexes.
One approach is to use masks to make it appear that the image views are overlapped.
The general idea would be:
subclass UIImageView
in layoutSubviews()
apply cornerRadius to layer to make the image round
get a rect from the "overlapping view"
convert that rect to local coordinates
expand that rect by the desired width of the "outline"
get an oval path from that rect
combine it with a path from self
apply it as a mask layer
Here is an example....
I was not entirely sure what your sizing calculations were doing... trying to use your EventDetailsFacepileView as-is gave me small images in the lower-right corner of the view?
So, I modified your EventDetailsFacepileView in a couple ways:
uses local images named "pro1" through "pro5" (you should be able to replace with your SDWebImage)
uses auto-layout constraints instead of explicit frames
uses MyOverlapImageView class to handle the masking
Code - no #IBOutlet connections, so just set a blank view controller to OverlapTestViewController:
class OverlapTestViewController: UIViewController {
let facePileView = MyFacePileView()
override func viewDidLoad() {
super.viewDidLoad()
facePileView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(facePileView)
facePileView.dimension = 120
let sz = facePileView.sizeThatFits(.zero)
let g = view.safeAreaLayoutGuide
NSLayoutConstraint.activate([
facePileView.widthAnchor.constraint(equalToConstant: sz.width),
facePileView.heightAnchor.constraint(equalTo: facePileView.widthAnchor),
facePileView.centerXAnchor.constraint(equalTo: g.centerXAnchor),
facePileView.centerYAnchor.constraint(equalTo: g.centerYAnchor),
])
facePileView.profilePicNames = [
"pro1", "pro2", "pro3", "pro4", "pro5"
]
}
}
class MyFacePileView: UIView {
var dimension: CGFloat = 66.0
lazy var radius: CGFloat = dimension / 1.68
private var profilePicViews: [MyOverlapImageView] = []
var profilePicNames: [String] = [] {
didSet {
updateView()
}
}
func updateView() {
self.profilePicViews = profilePicNames.map({ (profilePic) -> MyOverlapImageView in
let imageView = MyOverlapImageView()
if let img = UIImage(named: profilePic) {
imageView.image = img
}
return imageView
})
// add MyOverlapImageViews to self
// and set width / height constraints
self.profilePicViews.forEach { (imageView) in
self.addSubview(imageView)
imageView.translatesAutoresizingMaskIntoConstraints = false
imageView.widthAnchor.constraint(equalToConstant: dimension).isActive = true
imageView.heightAnchor.constraint(equalTo: imageView.widthAnchor).isActive = true
}
// start at "12 o'clock"
var curAngle: CGFloat = .pi * 1.5
// angle increment
let incAngle: CGFloat = ( 360.0 / CGFloat(self.profilePicViews.count) ) * .pi / 180.0
// calculate position for each image view
// set center constraints
self.profilePicViews.forEach { imgView in
let xPos = cos(curAngle) * radius
let yPos = sin(curAngle) * radius
imgView.centerXAnchor.constraint(equalTo: centerXAnchor, constant: xPos).isActive = true
imgView.centerYAnchor.constraint(equalTo: centerYAnchor, constant: yPos).isActive = true
curAngle += incAngle
}
// set "overlapView" property for each image view
let n = self.profilePicViews.count
for i in (1..<n).reversed() {
self.profilePicViews[i].overlapView = self.profilePicViews[i-1]
}
self.profilePicViews[0].overlapView = self.profilePicViews[n - 1]
self.layer.borderColor = UIColor.green.cgColor
self.layer.borderWidth = 2
}
override func sizeThatFits(_ size: CGSize) -> CGSize {
let requiredSize = dimension * 2.0 + radius / 2.0
return CGSize(width: requiredSize,
height: requiredSize)
}
}
class MyOverlapImageView: UIImageView {
// reference to the view that is overlapping me
weak var overlapView: MyOverlapImageView?
// width of "outline"
var outlineWidth: CGFloat = 6
override func layoutSubviews() {
super.layoutSubviews()
// make image round
layer.cornerRadius = bounds.size.width * 0.5
layer.masksToBounds = true
let mask = CAShapeLayer()
if let v = overlapView {
// get bounds from overlapView
// converted to self
// inset by outlineWidth (negative numbers will make it grow)
let maskRect = v.convert(v.bounds, to: self).insetBy(dx: -outlineWidth, dy: -outlineWidth)
// oval path from mask rect
let path = UIBezierPath(ovalIn: maskRect)
// path from self bounds
let clipPath = UIBezierPath(rect: bounds)
// append paths
clipPath.append(path)
mask.path = clipPath.cgPath
mask.fillRule = .evenOdd
// apply mask
layer.mask = mask
}
}
}
Result:
(I grabbed random images by searching google for sample profile pictures)
The shadow in my cell is not working at all.
This is one of the view that I want to add shadow but it's not working. I added this code inside my custom cell class.
super.layoutSubviews()
UIview1.layer.cornerRadius = 7
UIview1.layer.borderWidth = 1.0
UIview1.layer.borderColor = HexColor.hexStringToUIColor(hex: "FA2537").cgColor
UIview1.layer.masksToBounds = true
UIview1.layer.shadowColor = HexColor.hexStringToUIColor(hex: "01A4B7").cgColor
UIview1.layer.shadowOpacity = 0.5
UIview1.layer.shadowOffset = CGSize.zero
UIview1.layer.shadowRadius = 5
}
For showing shadow on a view, you need to set its layer's masksToBounds property false.
or you can try this.
You can make a method like this and can use:
extension UIView {
func setShadowWith(color: UIColor = UIColor.black, shadowOpacity: Float = 0.2, radius: Float = 1.0, shadowOffSet: CGSize = CGSize(width: 0, height: 1)) {
self.layer.shadowColor = color.cgColor
self.layer.shadowOpacity = shadowOpacity
self.layer.shadowOffset = shadowOffSet
self.layer.shadowRadius = CGFloat(radius)
}
}
and can use function like:
yourContainerView.setShadowWith()
Here parameters used in functions are taking default values. you can change accordingly.
Set maskToBounds to false instead of true:
UIview1.layer.masksToBounds = false
I have collection view (If the process is easier on a table view I can change it to that).
I need to display the index path of the Cell just before displaying the collection view cell.
I have been trying to figure out how to work on this, here are the things I worked out (Nothing has been a good solution).
Firstly, I tried using a Collection view cell with an added Label (For numbering) and UIView (For showing the content next to it). But the shadow code is not working for the UIView on the collection view cell.
#objc extension CALayer {
func applySketchShadow(
color: UIColor = .black,
alpha: Float = 0.5,
x: CGFloat = 0,
y: CGFloat = 2,
blur: CGFloat = 4,
spread: CGFloat = 0)
{
shadowColor = color.cgColor
shadowOpacity = alpha
shadowOffset = CGSize(width: x, height: y)
shadowRadius = blur / 2.0
if spread == 0 {
shadowPath = nil
} else {
let dx = -spread
let rect = bounds.insetBy(dx: dx, dy: dx)
shadowPath = UIBezierPath(rect: rect).cgPath
}
}
}
#objc extension UIView{
func applyShadowToView(){
self.layer.borderWidth = 1.0
self.layer.borderColor = UIColor.clear.cgColor
self.layer.masksToBounds = true
self.layer.masksToBounds = false
self.layer.applySketchShadow(color: UIColor.black, alpha: 0.09, x: 3, y: 2, blur: 50, spread: 4)
}}
For some weird reasons, my shadow view is not showing up. I tried various codes from online just to be sure, nothing works out.
Other things I thought off are having a header view to show the number of the Collection view, but header view needs to be as wide as Frame so this is not an option and
the other thing is having 2 collection view cells, even cells showing the Number and odd cells showing content.
But the problem with this is I want to add rearranging functionality later on and this method will not work when I want to do it.
I have a custom UITableView cell.I am setting it's bottom left & bottom right corner radius.I am setting corner radius in cellForAtindexPath.Below is the code for that
if indexPath.row == 9 {
recipeInfoCell.outerView.roundCorners(corners: [.bottomLeft, .bottomRight], radius: 10)
recipeInfoCell.layoutSubviews()
recipeInfoCell.layoutIfNeeded()
} else {
recipeInfoCell.outerView.roundCorners(corners: [.bottomLeft, .bottomRight], radius: 0)
recipeInfoCell.layoutSubviews()
}
Now when i first launch the tableview then it does not set any corner radius. But when i scroll again then it is setting the corner radius.
I have created an extension of UIView in which there is one function which is setting the corner radius
func roundCorners(corners: UIRectCorner, radius: CGFloat) {
let path = UIBezierPath(roundedRect: self.bounds, byRoundingCorners: corners, cornerRadii: CGSize(width: radius, height: radius))
let mask = CAShapeLayer()
mask.path = path.cgPath
self.layer.mask = mask
}
Please tell how do i resolve this ?
I do not think it is a good idea to set corner radius in cellForRow atIndexPath. The reason being, this function is called many times during the lifetime of UITableView and you only need to set the corner radius only once and that too when the cell is initialised. Changing the corner radius based on indexPath will also affect the UITableView's performance.
A better way to this would be to create two cells, one with corner radius as 0 and another with 10 and the use those cells based on indexPath.
Then you can put your cornerRadius set logic in layoutSubview function in your custom cell.
If you want to do it in your tableView methods only, the correct way is to do it in willDisplayCell because after that call, cell's layoutSubviews function in called.
func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
if indexPath.row % 2 == 0 {
let path = UIBezierPath(roundedRect: cell.contentView.bounds, byRoundingCorners: [.bottomRight, .bottomLeft], cornerRadii: CGSize(width: 10, height: 10))
let mask = CAShapeLayer()
mask.path = path.cgPath
cell.contentView.layer.mask = mask
} else {
let path = UIBezierPath(roundedRect: cell.bounds, byRoundingCorners: [.bottomRight, .bottomLeft], cornerRadii: CGSize(width: 0, height: 0))
let mask = CAShapeLayer()
mask.path = path.cgPath
cell.contentView.layer.mask = mask
}
}
UPDATE: May 19, 2017
The above concept will work fine when the view that you want to round and put shadow on is the same size as the cell's content view. But if it is anything different than that, it won't work.
The reason for the above statement is that at the time when willDisplayCell is called, where the above code is using cell.contentView.bounds, the other views are not calculated yet. So when we will be using another view, we will have to use that view's bounds to calculate the mask's frame which we will be different from the actual one.
After reading up on this a bit, I found out that, to do this kind of a thing is by overriding draw(_ rect: CGRect) function of UITableViewCell. Because at this point, the view's size has been properly calculated and we can create a correct frame.
Below is the code from custom UITableViewCell class:
var shadowLayer = CAShapeLayer()
override func draw(_ rect: CGRect) {
let path = UIBezierPath(roundedRect: self.outerView.bounds, byRoundingCorners: [.bottomRight, .bottomLeft], cornerRadii: CGSize(width: 10, height: 10))
let mask = CAShapeLayer()
mask.path = path.cgPath
self.outerView.layer.mask = mask
// Handle Cell reuse case
shadowLayer.removeFromSuperlayer()
shadowLayer.shadowPath = path.cgPath
shadowLayer.frame = self.outerView.layer.frame
print(shadowLayer.frame)
shadowLayer.shadowOffset = CGSize(width: 0, height: 0)
shadowLayer.shadowColor = UIColor.black.cgColor
shadowLayer.shadowOpacity = 0.9
self.contentView.layer.insertSublayer(shadowLayer, below: self.outerView.layer)
super.draw(rect)
}
put round corner code in main queue like this :
if indexPath.row == 9 { dispatch_async(dispatch_get_main_queue(),{
recipeInfoCell.outerView.roundCorners(corners: [.bottomLeft, .bottomRight], radius: 10)
})} else{
dispatch_async(dispatch_get_main_queue(),{
recipeInfoCell.outerView.roundCorners(corners: [.bottomLeft, .bottomRight], radius: 0)
}) }
Try writing these lines of code in layoutSubviews() of your custom UITableViewCell
override func layoutSubviews() {
super.layoutSubviews()
self.outerView.roundCorners(corners: [.bottomLeft, .bottomRight], radius: 10)
}
For acquiring that in swift only I use to create one subclass of the UIButton like below
(in any .swift file of project)
//MARK: Custom Class for UIView
open class CustomView: UIView {
open func drawViewsForRect(_ rect: CGRect) {
fatalError("\(#function) must be overridden")
}
open func updateViewsForBoundsChange(_ bounds: CGRect) {
fatalError("\(#function) must be overridden")
}
}
Then define the below methods in same or deferent .swift file like this
//MARK: - UIView Property Class
#IBDesignable open class CView : CustomView{
#IBInspectable dynamic open var borderColor: UIColor = UIColor.clear{
didSet{
updateBorderColor()
}
}
#IBInspectable dynamic open var borderWidth: CGFloat = 1.0{
didSet{
updateBorderWidth()
}
}
#IBInspectable dynamic open var cornerRadius: CGFloat = 0.0{
didSet{
updateBorderRadius()
}
}
#IBInspectable dynamic open var shadowColor: UIColor?{
didSet{
updateShadowColor()
}
}
#IBInspectable dynamic open var shadowRadius: CGFloat = 0.0{
didSet{
updateShadowRadius()
}
}
#IBInspectable dynamic open var shadowOpacity: Float = 0.0{
didSet{
updateShadowOpacity()
}
}
#IBInspectable dynamic open var shadowOffSet: CGSize = CGSize(width: 0.0, height: 0.0){
didSet{
updateShadowOffset()
}
}
//Update Borders Properties
open func updateBorderColor(){
self.layer.borderColor = borderColor.cgColor
}
open func updateBorderRadius(){
self.layer.cornerRadius = cornerRadius
}
open func updateBorderWidth(){
self.layer.borderWidth = borderWidth
}
//Update Shadow Properties
open func updateShadowColor(){
self.layer.shadowColor = shadowColor?.cgColor
self.clipsToBounds = false;
self.layer.masksToBounds = false;
}
open func updateShadowOpacity(){
self.layer.shadowOpacity = shadowOpacity
self.clipsToBounds = false;
self.layer.masksToBounds = false;
}
open func updateShadowRadius(){
self.layer.shadowRadius = shadowRadius
self.clipsToBounds = false;
self.layer.masksToBounds = false;
}
open func updateShadowOffset(){
self.layer.shadowOffset = CGSize(width: shadowOffSet.width, height: shadowOffSet.height)
self.layer.shadowColor = shadowColor?.cgColor
self.clipsToBounds = false;
self.layer.masksToBounds = false;
}
}
Then just assign the CView class in storyboard at design time for any view controller and just provide the required values for the properties for that in side the attribute inspector for that view
In Storyboard
1) Class of the View Like this
2) Set property like this
3) This will show view in side the design like this
With this you even been able to see the shadow or corner radius directly in your design builder i.e. in side the storyboard view like the third image.
You want a specific cell to round corner if i understand correctly. here is my solution.Though i am bit late but i try to help others. :) I just added my solution as a picture.
Step 1:
Created a custom Cell and did some necessary steps.
Below is the code for Rounded bottom left and bottom right.Sorry for poor coding style:
Below is My view controller's configuration for showing tableView with rounded cells.
And Below is the moment of truth:
I took reference from (https://stackoverflow.com/a/44067058/2781088) and modified the code and now it's working for me:
Add below code to your custom cell class:
enum cellStyle: Int {
case Normal = 0, Rounded
}
class CustomTableCell:UITableViewCell {
var cellType: Int = 0 {
didSet {
let maskLayer = CAShapeLayer()
let cell: cellStyle = cellStyle(rawValue: cellType)!
switch cell {
case .Normal:
let normal = UIBezierPath(roundedRect: self.viewMain.bounds, byRoundingCorners: [.bottomLeft, .bottomRight], cornerRadii: CGSize(width: 0, height: 0))
maskLayer.path = normal.cgPath
self.viewMain.layer.mask = maskLayer
case .Rounded:
let rounded = UIBezierPath(roundedRect: self.viewMain.bounds, byRoundingCorners: [.bottomLeft, .bottomRight], cornerRadii: CGSize(width: 10, height: 10))
maskLayer.path = rounded.cgPath
self.viewMain.layer.mask = maskLayer
}
}
}
}
In your ViewController->cellForRowAt --- Call below code on Main Queue
DispatchQueue.main.async {
if totalRows == index + 1 { //write your condition
cell.cellType = cellStyle.Rounded.rawValue
} else {
cell.cellType = cellStyle.Normal.rawValue
}
cell.layoutSubviews()
cell.layoutIfNeeded()
}
This worked for me:
view.clipsToBounds = true
view.layer.cornerRadius = value
view.layer.maskedCorners = [.layerMaxXMaxYCorner, .layerMinXMaxYCorner]
Based on my experience, this is what works for me to get the dynamic-sized layers work properly.
//Inside the cell or the view class
override func layoutSublayers(of layer: CALayer) {
super.layoutSublayers(of: layer)
if layer === self.layer {
//Do any dynamic-layer update here
myViewToRound.layer.cornerRadius = myViewToRound.bounds.width/2
}
}
here, replace myViewToRound with the UIView subclass that you want to be rounded inside your cell/view
I am trying to add a drop shadow to views that are layered on top of one another, the views collapse allowing content in other views to be seen, in this vein i want to keep view.clipsToBounds ON so that when the views collapse their content is clipped.
This seems to have made it difficult for me to add a drop shadow to the layers as when i turn clipsToBounds ON the shadows are clipped also.
I have been trying to manipulate view.frame and view.bounds in order to add a drop shadow to the frame but allow the bounds to be large enough to encompass it, however I have had no luck with this.
Here is the code I am using to add a Shadow (this only works with clipsToBounds OFF as shown)
view.clipsToBounds = NO;
view.layer.shadowColor = [[UIColor blackColor] CGColor];
view.layer.shadowOffset = CGSizeMake(0,5);
view.layer.shadowOpacity = 0.5;
Here is a screenshot of the shadow being applied to the top lightest grey layer. Hopefully this gives an idea of how my content will overlap if clipsToBounds is OFF.
How can I add a shadow to my UIView and keep my content clipped?
Edit: Just wanted to add that I have also played around with using background images with shadows on, which does work well, however I would still like to know the best coded solution for this.
Try this:
UIBezierPath *shadowPath = [UIBezierPath bezierPathWithRect:view.bounds];
view.layer.masksToBounds = NO;
view.layer.shadowColor = [UIColor blackColor].CGColor;
view.layer.shadowOffset = CGSizeMake(0.0f, 5.0f);
view.layer.shadowOpacity = 0.5f;
view.layer.shadowPath = shadowPath.CGPath;
First of all: The UIBezierPath used as shadowPath is crucial. If you don't use it, you might not notice a difference at first, but the keen eye will observe a certain lag occurring during events like rotating the device and/or similar. It's an important performance tweak.
Regarding your issue specifically: The important line is view.layer.masksToBounds = NO. It disables the clipping of the view's layer's sublayers that extend further than the view's bounds.
For those wondering what the difference between masksToBounds (on the layer) and the view's own clipToBounds property is: There isn't really any. Toggling one will have an effect on the other. Just a different level of abstraction.
Swift 2.2:
override func layoutSubviews()
{
super.layoutSubviews()
let shadowPath = UIBezierPath(rect: bounds)
layer.masksToBounds = false
layer.shadowColor = UIColor.blackColor().CGColor
layer.shadowOffset = CGSizeMake(0.0, 5.0)
layer.shadowOpacity = 0.5
layer.shadowPath = shadowPath.CGPath
}
Swift 3:
override func layoutSubviews()
{
super.layoutSubviews()
let shadowPath = UIBezierPath(rect: bounds)
layer.masksToBounds = false
layer.shadowColor = UIColor.black.cgColor
layer.shadowOffset = CGSize(width: 0.0, height: 5.0)
layer.shadowOpacity = 0.5
layer.shadowPath = shadowPath.cgPath
}
Wasabii's answer in Swift 2.3:
let shadowPath = UIBezierPath(rect: view.bounds)
view.layer.masksToBounds = false
view.layer.shadowColor = UIColor.blackColor().CGColor
view.layer.shadowOffset = CGSize(width: 0, height: 0.5)
view.layer.shadowOpacity = 0.2
view.layer.shadowPath = shadowPath.CGPath
And in Swift 3/4/5:
let shadowPath = UIBezierPath(rect: view.bounds)
view.layer.masksToBounds = false
view.layer.shadowColor = UIColor.black.cgColor
view.layer.shadowOffset = CGSize(width: 0, height: 0.5)
view.layer.shadowOpacity = 0.2
view.layer.shadowPath = shadowPath.cgPath
Put this code in layoutSubviews() if you're using AutoLayout.
In SwiftUI, this is all much easier:
Color.yellow // or whatever your view
.shadow(radius: 3)
.frame(width: 200, height: 100)
The trick is defining the masksToBounds property of your view's layer properly:
view.layer.masksToBounds = NO;
and it should work.
(Source)
You can create an extension for UIView to access these values in the design editor
extension UIView{
#IBInspectable var shadowOffset: CGSize{
get{
return self.layer.shadowOffset
}
set{
self.layer.shadowOffset = newValue
}
}
#IBInspectable var shadowColor: UIColor{
get{
return UIColor(cgColor: self.layer.shadowColor!)
}
set{
self.layer.shadowColor = newValue.cgColor
}
}
#IBInspectable var shadowRadius: CGFloat{
get{
return self.layer.shadowRadius
}
set{
self.layer.shadowRadius = newValue
}
}
#IBInspectable var shadowOpacity: Float{
get{
return self.layer.shadowOpacity
}
set{
self.layer.shadowOpacity = newValue
}
}
}
You can set shadow to your view from storyboard also
On viewWillLayoutSubviews:
override func viewWillLayoutSubviews() {
sampleView.layer.masksToBounds = false
sampleView.layer.shadowColor = UIColor.darkGrayColor().CGColor;
sampleView.layer.shadowOffset = CGSizeMake(2.0, 2.0)
sampleView.layer.shadowOpacity = 1.0
}
Using Extension of UIView:
extension UIView {
func addDropShadowToView(targetView:UIView? ){
targetView!.layer.masksToBounds = false
targetView!.layer.shadowColor = UIColor.darkGrayColor().CGColor;
targetView!.layer.shadowOffset = CGSizeMake(2.0, 2.0)
targetView!.layer.shadowOpacity = 1.0
}
}
Usage:
sampleView.addDropShadowToView(sampleView)
So yes, you should prefer the shadowPath property for performance, but also:
From the header file of CALayer.shadowPath
Specifying the path explicitly using this property will usually
* improve rendering performance, as will sharing the same path
* reference across multiple layers
A lesser known trick is sharing the same reference across multiple layers. Of course they have to use the same shape, but this is common with table/collection view cells.
I don't know why it gets faster if you share instances, i'm guessing it caches the rendering of the shadow and can reuse it for other instances in the view. I wonder if this is even faster with