CODEWITHSUNDEEP
iphoneioscalayershadow
Zeropointer
Zeropointer

Reputation: 510

Shadow left and right of UIView

Hi i like to add an CALayer Shadow to an View where the shadow was left and right of the view the simplest way was:

someView.layer.shadowColor = [[UIColor blackColor] CGColor];
someView.layer.shadowOffset = CGSizeMake(0.0f,0.0f);
someView.layer.shadowOpacity = 1.0f;
someView.layer.shadowRadius = 10.0f;
someView.layer.shadowPath = [[UIBezierPath bezierPathWithRect:someView.bounds] CGPath];

but i will add a bigger shadow as like a shadow when i increase the shadowRadius it do not look good. How i can make a shadow that looks good at left and right.

Upvotes: 7

Views: 24528

Answers (4)

GuimarãesGabrielG
GuimarãesGabrielG

Reputation: 101

I created a shadow that can be used at the top/bottom or left/right, without prejudice at all. No shadow will appear in the left/right if you choose top/bottom, and so on. I hope I helped. Here's the code:


import UIKit

class ViewController: UIViewController {
  
    
     override func viewDidLoad() {
        super.viewDidLoad()
        
        let imgView = UIImageView(frame: CGRect(x: self.view.bounds.midX - 150, y: self.view.bounds.midY - 150, width: 300, height: 300))
            
        imgView.contentMode = .scaleToFill
        imgView.image = UIImage(named: "name image")

        self.view.addSubview(imgView)
        //You can put left/right or top/bottom
        imgView.addShadow(sides: .leftRight, constant: 10, alpha: 5)

        
     }

}

extension UIView{
    
    func addShadow(sides: Sides, constant: Int, alpha: Int){
        if(constant > 0 && alpha > 0){
        switch sides {
            case .leftRight:
   
                let view = UIView(frame: CGRect(x: -CGFloat(constant), y: 0, width: self.bounds.width + CGFloat((constant * 2)), height: self.bounds.height))
                self.addSubview(view)

                addMask(sides: .leftRight, view: view, constant: constant, shadowRadius: alpha)
                
            case .topBottom:

                let view = UIView(frame: CGRect(x: 0, y: -CGFloat(constant), width: self.bounds.width , height: self.bounds.height + CGFloat(constant * 2)))
                self.addSubview(view)

                addMask(sides: .topBottom, view: view, constant: constant, shadowRadius: alpha)

            }
        }
    }
    
    private func addMask(sides:Sides, view: UIView, constant: Int, shadowRadius:Int){
        let mutablePath = CGMutablePath()
        let mask = CAShapeLayer()

        switch sides {
        case .leftRight:
            
            mutablePath.addRect(CGRect(x: -CGFloat(constant), y: 0, width: view.bounds.width, height: view.bounds.height))

            mutablePath.addRect(CGRect(x: CGFloat(constant) , y: 0, width: view.bounds.width , height: view.bounds.height))

            
        case .topBottom:
            
            mutablePath.addRect(CGRect(x: 0, y: -CGFloat(constant), width: view.bounds.width, height: view.bounds.height))

            mutablePath.addRect(CGRect(x: 0, y: CGFloat(constant) , width: view.bounds.width , height: view.bounds.height))
        }

        mask.path = mutablePath

        mask.fillRule = CAShapeLayerFillRule.evenOdd
        mask.fillColor  = UIColor(white:1.0, alpha: 0.2).cgColor
        view.layer.mask = mask
        view.layer.addSublayer(mask)
        mask.shadowColor = UIColor.black.cgColor
        mask.shadowRadius = CGFloat(shadowRadius)
        mask.shadowOpacity = 1.0
        mask.shadowOffset = CGSize(width: 0, height: 0)

    }
}

enum Sides{
    case leftRight
    case topBottom
}

You just need to call the extension UIView, which has the addShadow() function and pass the parameters you want.

enter image description here

enter image description here

Upvotes: 0

Fangming
Fangming

Reputation: 25261

swift 3.0 version

imageView.layer.shadowOpacity = 0.8
imageView.layer.shadowOffset = CGSize(width: 0, height: 3)
imageView.layer.shadowRadius = 4.0

let shadowRect: CGRect = imageView.bounds.insetBy(dx: 0, dy: 4)
imageView.layer.shadowPath = UIBezierPath(rect: shadowRect).cgPath

Upvotes: 8

JTing
JTing

Reputation: 651

progrmr's answer was very helpful, cheers!

I made a slide-out menu and I had a problem with the shadow surrounding my VC and disrupting the navigation bar. Turned out I had to inset the shadow layer.

Here's my solution using swift:

rightViewController!.view.layer.shadowOpacity = 0.8
rightViewController!.view.layer.shadowOffset = CGSizeMake(0, 3)
rightViewController!.view.layer.shadowRadius = 4.0

let shadowRect: CGRect = CGRectInset(rightViewController!.view.bounds, 0, 4);  // inset top/bottom
rightViewController!.view.layer.shadowPath = UIBezierPath(rect: shadowRect).CGPath

Upvotes: 0

progrmr
progrmr

Reputation: 77191

I think 10 is a pretty big shadow radius, try 3 or 4 instead, also opacity I usually use 0.7:

someView.layer.shadowColor = [[UIColor blackColor] CGColor];
someView.layer.shadowOffset = CGSizeMake(0.0f,0.0f);
someView.layer.shadowOpacity = 0.7f;
someView.layer.shadowRadius = 4.0f;

If you want the shadow only on left and right, then inset the rectangle on the top and bottom so the top and bottom shadow are hidden behind your view:

CGRect shadowRect = CGRectInset(someView.bounds, 0, 4);  // inset top/bottom
someView.layer.shadowPath = [[UIBezierPath bezierPathWithRect:shadowRect] CGPath];

I'm not really sure if that's what you wanted.

Upvotes: 31

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