Giving Uiview Rounded Corners

Giving UIView rounded corners

Try this

#import <QuartzCore/QuartzCore.h> // not necessary for 10 years now  :)

...

view.layer.cornerRadius = 5;
view.layer.masksToBounds = true;

Note: If you are trying to apply rounded corners to a UIViewController's view, it should not be applied in the view controller's constructor, but rather in -viewDidLoad, after view is actually instantiated.

UIView with rounded corners and drop shadow?

The following code snippet adds a border, border radius, and drop shadow to v, a UIView:

// border radius
[v.layer setCornerRadius:30.0f];

// border
[v.layer setBorderColor:[UIColor lightGrayColor].CGColor];
[v.layer setBorderWidth:1.5f];

// drop shadow
[v.layer setShadowColor:[UIColor blackColor].CGColor];
[v.layer setShadowOpacity:0.8];
[v.layer setShadowRadius:3.0];
[v.layer setShadowOffset:CGSizeMake(2.0, 2.0)];

Swift 5 Version :

// border radius
v.layer.cornerRadius = 30.0

// border
v.layer.borderColor = UIColor.lightGray.cgColor
v.layer.borderWidth = 1.5

// drop shadow
v.layer.shadowColor = UIColor.black.cgColor
v.layer.shadowOpacity = 0.8
v.layer.shadowRadius = 3.0
v.layer.shadowOffset = CGSize(width: 2.0, height: 2.0)

You can adjust the settings to suit your needs.

Also, add the QuartzCore framework to your project and:

#import <QuartzCore/QuartzCore.h>

See my other answer regarding masksToBounds.

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Note

This may not work in all cases. If you find that this method interferes with other drawing operations that you are performing, please see this answer.

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]

Use Storyboard to mask UIView and give rounded corners?

Yes, I use that a lot but question like this was already answered many times.

But anyway in Interface Builder.
You need to add User Defined Runtime Attributes like this:

layer.masksToBounds Boolean YES
layer.cornerRadius Number {View's Width/2}

and enable

Clips subviews

Results:

Rounded corners changes UIView size

Its because your CAShapeLayer is not automatically resizing once the Header View's constraints are being resized. You need to update the path whenever the view is resized:

  let headerView: UIView!

  override func awakeFromNib() {
    super.awakeFromNib()

    headerView = UIView(frame: bounds)
    headerView.frame = bounds

    headerView.leadingAnchor.constraint(equalTo: self.leadingAnchor, constant: 8).isActive = true
    headerView.topAnchor.constraint(equalTo: self.topAnchor, constant: 4).isActive = true
    headerView.trailingAnchor.constraint(equalTo: self.trailingAnchor, constant: -8).isActive = true
    headerView.heightAnchor.constraint(equalToConstant: 40).isActive = true


    let rectShape = CAShapeLayer()
    rectShape.bounds = headerView.layer.frame
    rectShape.position = headerView.center

    headerView.layer.backgroundColor = UIColor.green.cgColor
    headerView.layer.mask = rectShape
  }

  override func layoutSubviews() {
    super.layoutSubviews()

    rectShape.path = UIBezierPath(roundedRect: headerView.layer.bounds, byRoundingCorners: [ .topLeft, .topRight], cornerRadii: CGSize(width: 10, height: 10)).cgPath
  }

I used awakeFromNib just as an example. Your setup for your view may be different in your custom UITableViewCell class.

Setting corner radius hides UIView

It seems, that you need use self.bounds instead self.frame in UIBezierPath(roundedRect: self.frame, byRoundingCorners: corners, cornerRadii: CGSize(width: radius, height: 0.0))

How to control an UIView's rounded corners separately using @IBInspectable in Swift 3?

Use this custom class, basically you need create a bezier path, using lines and quad curves, handling every corner with values in @IBInspectable properties.

This is the code

//
//  CornerView.swift
//  UIViewCornerRounded
//
//  Created by Reinier Melian on 21/07/2017.
//  Copyright © 2017 Pruebas. All rights reserved.
//

import UIKit


@IBDesignable
class CornerView: UIView {
    
    @IBInspectable var leftTopRadius : CGFloat = 0{
        didSet{
            self.applyMask()
        }
    }
    @IBInspectable var rightTopRadius : CGFloat = 0{
        didSet{
            self.applyMask()
        }
    }
    @IBInspectable var rightBottomRadius : CGFloat = 0{
        didSet{
            self.applyMask()
        }
    }
    
    @IBInspectable var leftBottomRadius : CGFloat = 0{
        didSet{
            self.applyMask()
        }
    }

    
    override func layoutSubviews() {
        super.layoutSubviews()
        self.applyMask()
    }
    
    // Only override draw() if you perform custom drawing.
    // An empty implementation adversely affects performance during animation.
    /*override func draw(_ rect: CGRect) {
        super.draw(rect)

    }*/
    
    func applyMask()
    {
        let shapeLayer = CAShapeLayer(layer: self.layer)
        shapeLayer.path = self.pathForCornersRounded(rect:self.bounds).cgPath
        shapeLayer.frame = self.bounds
        shapeLayer.masksToBounds = true
        self.layer.mask = shapeLayer
    }
    
    func pathForCornersRounded(rect:CGRect) ->UIBezierPath
    {
        let path = UIBezierPath()
        path.move(to: CGPoint(x: 0 + leftTopRadius , y: 0))
        path.addLine(to: CGPoint(x: rect.size.width - rightTopRadius , y: 0))
        path.addQuadCurve(to: CGPoint(x: rect.size.width , y: rightTopRadius), controlPoint: CGPoint(x: rect.size.width, y: 0))
        path.addLine(to: CGPoint(x: rect.size.width , y: rect.size.height - rightBottomRadius))
        path.addQuadCurve(to: CGPoint(x: rect.size.width - rightBottomRadius , y: rect.size.height), controlPoint: CGPoint(x: rect.size.width, y: rect.size.height))
        path.addLine(to: CGPoint(x: leftBottomRadius , y: rect.size.height))
        path.addQuadCurve(to: CGPoint(x: 0 , y: rect.size.height - leftBottomRadius), controlPoint: CGPoint(x: 0, y: rect.size.height))
        path.addLine(to: CGPoint(x: 0 , y: leftTopRadius))
        path.addQuadCurve(to: CGPoint(x: 0 + leftTopRadius , y: 0), controlPoint: CGPoint(x: 0, y: 0))
        path.close()
        
        return path
    }
    
}

Here is the results

Using this values

Hope this helps

Swift UIView Subviews not rounding corners in Custom UIView Subclass

An easy way to make it look as expected is to add layoutIfNeeded() call inside your makeCircle(v:UIView) method. This will make you sure that all views' frames are updated correctly before applying visual changes:

func makeCircle(v:UIView) {
        v.layoutIfNeeded()
        v.layer.cornerRadius = v.frame.size.width * 0.50
        v.clipsToBounds = true
    }

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