Question

我通常使用以下代码设置圆角。

imageView.layer.cornerRadius = 10

当imageView设置为Aspect Fill时，它可以正常工作。

但是当imageView设置为Aspect Fit模式时，imageView和图片之间的比例不同。圆角效果无法分辨。

背景颜色设置为绿色以显示圆角。

有没有办法设置真正的图片部分＆＃39;圆角。

提前感谢您的回答。

Answer 1

将此扩展名用于UIImageView：

extension UIImageView
{
    func roundCornersForAspectFit(radius: CGFloat)
    {
        if let image = self.image {

            //calculate drawingRect
            let boundsScale = self.bounds.size.width / self.bounds.size.height
            let imageScale = image.size.width / image.size.height

            var drawingRect: CGRect = self.bounds

            if boundsScale > imageScale {
                drawingRect.size.width =  drawingRect.size.height * imageScale
                drawingRect.origin.x = (self.bounds.size.width - drawingRect.size.width) / 2
            } else {
                drawingRect.size.height = drawingRect.size.width / imageScale
                drawingRect.origin.y = (self.bounds.size.height - drawingRect.size.height) / 2
            }
            let path = UIBezierPath(roundedRect: drawingRect, cornerRadius: radius)
            let mask = CAShapeLayer()
            mask.path = path.cgPath
            self.layer.mask = mask
        }
    }
}

Answer 2

Swift 3版本的有用，已接受的答案已经结束了！

extension UIImageView {
func roundCornersForAspectFit(radius: CGFloat)
{
    if let image = self.image {

        //calculate drawingRect
        let boundsScale = self.bounds.size.width / self.bounds.size.height
        let imageScale = image.size.width / image.size.height

        var drawingRect : CGRect = self.bounds

        if boundsScale > imageScale {
            drawingRect.size.width =  drawingRect.size.height * imageScale
            drawingRect.origin.x = (self.bounds.size.width - drawingRect.size.width) / 2
        }else {
            drawingRect.size.height = drawingRect.size.width / imageScale
            drawingRect.origin.y = (self.bounds.size.height - drawingRect.size.height) / 2
        }
        let path = UIBezierPath(roundedRect: drawingRect, cornerRadius: radius)
        let mask = CAShapeLayer()
        mask.path = path.cgPath
        self.layer.mask = mask
        }
    }
}

Answer 3

试试这可能会对您有所帮助：

import UIKit


class ViewController: UIViewController{

    @IBOutlet weak var myImageView: UIImageView!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        myImageView.contentMode = UIViewContentMode.ScaleAspectFit
        myImageView.clipsToBounds = true
        //myImageView.layer.cornerRadius = 10.0
        myImageView.layer.masksToBounds = true

        let simpleImage = UIImage(named:"ipad5_einladung.jpg")
        let corneredImage = generateRoundCornerImage(simpleImage!, radius: 10)

        //Set cornered Image
        myImageView.image = corneredImage;

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


    func generateRoundCornerImage(image : UIImage , radius : CGFloat) -> UIImage {

        let imageLayer = CALayer()
        imageLayer.frame = CGRectMake(0, 0, image.size.width, image.size.height)
        imageLayer.contents = image.CGImage
        imageLayer.masksToBounds = true
        imageLayer.cornerRadius = radius

        UIGraphicsBeginImageContext(image.size)
        imageLayer.renderInContext(UIGraphicsGetCurrentContext())
        let roundedImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()

        return roundedImage
    }

}

Answer 4

首先需要将宽度和高度设置为相同的值。然后像这样设置图像属性：

imgProfile_Pic.layer.cornerRadius = cell.imgProfile_Pic.frame.size.height / 2
imgProfile_Pic.layer.borderWidth = 3.0
imgProfile_Pic.layer.borderColor = UIColor.white.cgColor
imgProfile_Pic.clipsToBounds = true
imgProfile_Pic.layoutIfNeeded()

Answer 5

这是转换为Objective-C的接受答案：

if (self.image) {
    double boundsScale = self.bounds.size.width / self.bounds.size.height;
    double imageScale = self.image.size.width / self.image.size.height;

    CGRect drawingRect = self.bounds;

    if (boundsScale > imageScale) {
        drawingRect.size.width = drawingRect.size.height * imageScale;
        drawingRect.origin.x = (self.bounds.size.width - drawingRect.size.width) / 2;
    }
    else {
        drawingRect.size.height = drawingRect.size.width / imageScale;
        drawingRect.origin.y = (self.bounds.size.height - drawingRect.size.height) / 2;
    }
    UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:drawingRect cornerRadius:cornerRadius];
    CAShapeLayer *mask = [CAShapeLayer new];
    [mask setPath:path.CGPath];
    [self.layer setMask:mask];
}

将它放在UIImageView的类别中。

Answer 6

我想评论Arun的答案，以帮助那些在使用Arun的方法时遇到问题的人，但是在“收藏夹视图”中，您必须启动imageView的框架作为收藏夹视图单元格的框架。

即

let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "identifier", for: indexPath) as UICollectionViewCell
let imageView = UIImageView(frame: cell.frame)

很显然，您想重构这些东西，但是您明白了。

Answer 7

这样可以非常简单地围绕图像视图：

self.profileImageView?.clipsToBounds = true
self.profileImageView!.layer.cornerRadius = 10
self.profileImageView?.layer.borderWidth = 1.0
self.profileImageView?.contentMode = .ScaleAspectFit

但是为了使图像视图以图像比率四舍五入，我认为您必须为ScaleAspectFill模式设置图像视图。

如何为方面适合模式设置带圆角的UIImageView

7 个答案: