How to set corner radius of imageView?

Question

In Objective-C such line

self.mainImageView.layer.cornerRadius = CGRectGetWidth(self.mainImageView.frame)/4.0f;

does its job, I tried it in Swift using analogy

self.mainImageView.layer.cornerRadius = CGRectGetWidth(self.mainImageView.frame)/4.0

and it doesn't change anything, the corners are the same as before. Moreover, Xcode does not show any syntax errors. Does Swift support any other way to reach this goal? I checked some other threads here and usually it's getting done in Swift in the way showed above.

Solution 1

Layer draws out of clip region, you need to set it to mask to bounds:

self.mainImageView.layer.masksToBounds = true

From the docs:

By default, the corner radius does not apply to the image in the layer’s contents property; it applies only to the background color and border of the layer. However, setting the masksToBounds property to true causes the content to be clipped to the rounded corners

Solution 2

There is one tiny difference in Swift 3.0 and Xcode8

Whenever you want to apply corner radius to UIView, make sure you call yourUIView.layoutIfNeeded() before calling cornerRadius.

Otherwise, it will return the default value for UIView's height and width (1000.0) which will probably make your View disappear.

Always make sure that all effects that changes the size of UIView (Interface builder constraints etc) are applied before setting any layer properties.

Example of UIView class implementation

class BadgeView: UIView {

  override func awakeFromNib() {

    self.layoutIfNeeded()
    layer.cornerRadius = self.frame.height / 2.0
    layer.masksToBounds = true

   }
 }

Solution 3

You can define border radius of any view providing an "User defined Runtime Attributes", providing key path "layer.cornerRadius" of type string and then the value of radius you need ;) See attached images below:

Solution 4

try this

self.mainImageView.layer.cornerRadius = CGRectGetWidth(self.mainImageView.frame)/4.0
self.mainImageView.clipsToBounds = true

Solution 5

Marked with @IBInspectable in swift (or IBInspectable in Objective-C), they are easily editable in Interface Builder’s attributes inspector panel.
You can directly set borderWidth,cornerRadius,borderColor in attributes inspector

extension UIView {

  @IBInspectable var cornerRadius: CGFloat {

   get{
        return layer.cornerRadius
    }
    set {
        layer.cornerRadius = newValue
        layer.masksToBounds = newValue > 0
    }
  }

  @IBInspectable var borderWidth: CGFloat {
    get {
        return layer.borderWidth
    }
    set {
        layer.borderWidth = newValue
    }
  }

  @IBInspectable var borderColor: UIColor? {
    get {
        return UIColor(cgColor: layer.borderColor!)
    }
    set {
        layer.borderColor = borderColor?.cgColor
    }
  }
}

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Comments

[theDC]

I missed that line, now works perfectly fine, thank you @DarthMike !

[erics]

masksToBounds was also needed for me to get it to work after the update to Swift 3.0

[Joe Sene]

Border Color is not working. It returns black always.

[iman kazemayni]

this answer is correct for roundcorner after get image from url and set to imageview

[Vincent Gigandet]

This is a clean & simple solution

[fredericdnd]

Calling from the main thread helped me because I rounded containerView - which was a subview of my tableView cells - in the willDisplay tableView delegate method. Without calling it from the main thread, the frame was wrong

[Phuc Dang]

@JoeSene layer.borderColor = borderColor?.cgColor is wrong, just update it like this: layer.borderColor = newValue?.cgColor

[rolandforbes]

my guuuyyyy nice!