What's the Best Way to Add a Drop Shadow to My Uiview

What's the best way to add a drop shadow to my UIView

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
}

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.

---

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.

add Shadow on UIView using swift 3

CODE SNIPPET:

extension UIView {

  // OUTPUT 1
  func dropShadow(scale: Bool = true) {
    layer.masksToBounds = false
    layer.shadowColor = UIColor.black.cgColor
    layer.shadowOpacity = 0.5
    layer.shadowOffset = CGSize(width: -1, height: 1)
    layer.shadowRadius = 1

    layer.shadowPath = UIBezierPath(rect: bounds).cgPath
    layer.shouldRasterize = true
    layer.rasterizationScale = scale ? UIScreen.main.scale : 1
  }

  // OUTPUT 2
  func dropShadow(color: UIColor, opacity: Float = 0.5, offSet: CGSize, radius: CGFloat = 1, scale: Bool = true) {
    layer.masksToBounds = false
    layer.shadowColor = color.cgColor
    layer.shadowOpacity = opacity
    layer.shadowOffset = offSet
    layer.shadowRadius = radius

    layer.shadowPath = UIBezierPath(rect: self.bounds).cgPath
    layer.shouldRasterize = true
    layer.rasterizationScale = scale ? UIScreen.main.scale : 1
  }
}

NOTE: If you don't pass any parameter to that function, then the scale argument will be true by default. You can define a default value for any parameter in a function by assigning a value to the parameter after that parameter’s type. If a default value is defined, you can omit that parameter when calling the function.

OUTPUT 1:

shadowView.dropShadow()

OUTPUT 2:

shadowView.dropShadow(color: .red, opacity: 1, offSet: CGSize(width: -1, height: 1), radius: 3, scale: true)

layer.shouldRasterize = true will make the shadow static and cause a shadow for the initial state of the UIView. So I would recommend not to use layer.shouldRasterize = true in dynamic layouts like view inside a UITableViewCell.

Drop a shadow to right and bottom of uiview

Try the following code, it might help you

    myView.layer.shadowColor = [UIColor purpleColor].CGColor;
    myView.layer.shadowOffset = CGSizeMake(5, 5);
    myView.layer.shadowOpacity = 1;
    myView.layer.shadowRadius = 1.0;
    myView.layer.maskToBounds = NO;

I tested this code and it's working and output is:

iOS : How to add drop shadow and stroke shadow on UIView?

I believe most of configuration you look for can be achieved by employing the shadowPath property.

viewCheck.layer.shadowRadius  = 1.5f;
viewCheck.layer.shadowColor   = [UIColor colorWithRed:176.f/255.f green:199.f/255.f blue:226.f/255.f alpha:1.f].CGColor;
viewCheck.layer.shadowOffset  = CGSizeMake(0.0f, 0.0f);
viewCheck.layer.shadowOpacity = 0.9f;
viewCheck.layer.masksToBounds = NO;

UIEdgeInsets shadowInsets     = UIEdgeInsetsMake(0, 0, -1.5f, 0);
UIBezierPath *shadowPath      = [UIBezierPath bezierPathWithRect:UIEdgeInsetsInsetRect(viewCheck.bounds, shadowInsets)];
viewCheck.layer.shadowPath    = shadowPath.CGPath;

e.g, by setting shadowInsets this way

UIEdgeInsets shadowInsets = UIEdgeInsetsMake(0, 0, -1.5f, 0);

you will get a nice desirable shadow:

You can decide now how you want the shadow rectangle to be constructed by controlling the shadow path rectangle insets.

IOS: How to make a shadow for UIView on 4 side (top,right,bottom and left)

Like this:

float shadowSize = 10.0f;
UIBezierPath *shadowPath = [UIBezierPath bezierPathWithRect:CGRectMake(self.avatarImageView.frame.origin.x - shadowSize / 2,
                                                                       self.avatarImageView.frame.origin.y - shadowSize / 2,
                                                                       self.avatarImageView.frame.size.width + shadowSize,
                                                                       self.avatarImageView.frame.size.height + shadowSize)];
self.avatarImageView.layer.masksToBounds = NO;
self.avatarImageView.layer.shadowColor = [UIColor blackColor].CGColor;
self.avatarImageView.layer.shadowOffset = CGSizeMake(0.0f, 0.0f);
self.avatarImageView.layer.shadowOpacity = 0.8f;
self.avatarImageView.layer.shadowPath = shadowPath.CGPath;

Swift 3 version:

    let shadowSize : CGFloat = 5.0
    let shadowPath = UIBezierPath(rect: CGRect(x: -shadowSize / 2,
                                               y: -shadowSize / 2,
                                               width: self.avatarImageView.frame.size.width + shadowSize,
                                               height: self.avatarImageView.frame.size.height + shadowSize))
    self.avatarImageView.layer.masksToBounds = false
    self.avatarImageView.layer.shadowColor = UIColor.black.cgColor
    self.avatarImageView.layer.shadowOffset = CGSize(width: 0.0, height: 0.0)
    self.avatarImageView.layer.shadowOpacity = 0.5
    self.avatarImageView.layer.shadowPath = shadowPath.cgPath

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.

---

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 shadow to an UIView in Xamarin.iOS?

Cause:

You seem forgot to set the Rect of the path

Solution 1:

You could directly set the shadow of the button

public override void ViewDidLayoutSubviews()
{
    base.ViewDidLayoutSubviews();

    PreviousButton.Layer.MasksToBounds = false;
    PreviousButton.Layer.ShadowColor = UIColor.Gray.CGColor;
    PreviousButton.Layer.ShadowOffset = new CoreGraphics.CGSize(0f, 7f);
    PreviousButton.Layer.ShadowOpacity = 1;   
}

Solution 2:
If you do want to use BezierPath , set the rect of it .

public override void ViewDidLayoutSubviews()
{
    base.ViewDidLayoutSubviews();
    UIBezierPath path = UIBezierPath.FromRect(PreviousButton.Bounds);
    PreviousButton.Layer.MasksToBounds = false;
    PreviousButton.Layer.ShadowColor = UIColor.Gray.CGColor;
    PreviousButton.Layer.ShadowOffset = new CoreGraphics.CGSize(0f, 7f);
    PreviousButton.Layer.ShadowOpacity = 1;
    PreviousButton.Layer.ShadowPath = path.CGPath;   
}

---

Related Topics