Swift 4 - 快速带有两个圆角的图像视图？

Question

I have a UIImageView inside of a UICollectionView Cell and I wanna make it' s top corners rounded. I couldn' t solve on my on, any help is appreciated.

You can see cell has 10px corner radius and I want same effect to be applied on image too.

Answer 1

You can try UIRectCorner Document here

here my custom class AGRoundCornersView

extension UIImageView {
    public func roundCorners(_ corners: UIRectCorner, radius: CGFloat) {
        let maskPath = UIBezierPath(roundedRect: bounds,
                                    byRoundingCorners: corners,
                                    cornerRadii: CGSize(width: radius, height: radius))
        let shape = CAShapeLayer()
        shape.path = maskPath.cgPath
        layer.mask = shape
    }
}

code :

1. Call When View is resized.

uiimage.roundCorners([.topLeft, .topRight], radius: 10)

2. Create custom class

class CustomImageView: UIImageView {
    override func layoutSubviews() {
        super.layoutSubviews()
        self.roundCorners([.topLeft, .topRight], radius: 10)
    }
}

Answer 2

Try this in your UICollectionViewCell

 override func awakeFromNib() {
        super.awakeFromNib()
        DispatchQueue.main.async {
            self.image.roundCorners([.topRight,.topLeft], radius: 8)
            self.image.layer.masksToBounds = true
        }
    }

Answer 3

Thanks to AshvinGudaliya and Sujewan

Following code worked for my collection cell's ImageView Top Left-Right corners

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell:TUGBucketCell = collectionView.dequeueReusableCell(withReuseIdentifier: "CustomCell", for: indexPath) as! TUGBucketCell
        //Rounded corner ImageView
        DispatchQueue.main.async {
            cell.imgVw.roundCorners([.topLeft, .topRight], radius: 10)
            cell.imgVw.layer.masksToBounds = true
        }

        return cell
    }

and the extension is

extension UIImageView {
    public func roundCorners(_ corners: UIRectCorner, radius: CGFloat) {
        let maskPath = UIBezierPath(roundedRect: bounds,
                                    byRoundingCorners: corners,
                                    cornerRadii: CGSize(width: radius, height: radius))
        let shape = CAShapeLayer()
        shape.path = maskPath.cgPath
        layer.mask = shape
    }
}

Answer 4

Swift 5

In your collectionview cell, put the below two lines of code & you are good to go. No need to write any extension:

cell._imageView.layer.cornerRadius = 10
cell._imageView.layer.maskedCorners = [.layerMinXMinYCorner, .layerMaxXMinYCorner]

Here corner radius will apply TopLeft & TopRight corners & rest of corners will remain same.

If you want to apply the corner radius in BottomLeft & BottomRight corners, then maskedCorners should look like the below:

cell._imageView.layer.maskedCorners = [.layerMinXMaxYCorner, .layerMaxXMaxYCorner]

Hope it helps.