不能在图像视图拉伸到其边界的层上设置CornerRadius和Shadow?

您将需要两个嵌套视图,内部视图设置圆角和剪切到绑定,外部视图具有阴影(因此不剪切)。在您的情况下,内部和外部视图可能是“child”和“parent”,但我想您没有为这些视图设置正确的剪切值?

在中查看答案 Why masksToBounds = YES prevents CALayer shadow? .

通常情况下,必须将clipstobounds设置为圆角,但由于要保留阴影,因此也必须将阴影的角设置为圆角。是否尝试使用贝塞尔路径设置阴影路径?将clipstobounds/maskstobounds保留为默认值,不。类似于:

  [[parent layer] setCornerRadius:6.0f];
  [[parent layer] setShadowPath:
             [[UIBezierPath bezierPathWithRoundedRect:[parent bounds] 
                   cornerRadius:6.0f] CGPath]];

是否尝试设置子uiImageView的边界,使其也具有圆角?那么它可能不会覆盖容器视图的阴影。只是一个想法,不确定它是否会起作用。

使用Swift 3,可以选择以下两个代码段中的一个,以便在图像视图或包含图像层的视图上设置CornerRadius和Shadow。

1。使用 UIView , CALayer 以及弹簧和支柱

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // constants
        let radius: CGFloat = 20, dimension: CGFloat = 200, offset = 8
        let frame = CGRect(x: 0, y: 0, width: 200, height: 200)

        // custom view
        let customView = UIView(frame: frame)
        customView.contentMode = .scaleAspectFill

        // image layer
        let imageLayer = CALayer()
        imageLayer.contentsGravity = kCAGravityResizeAspectFill
        imageLayer.contents = UIImage(named: "image")!.cgImage
        imageLayer.masksToBounds = true
        imageLayer.frame = frame
        imageLayer.cornerRadius = radius
        imageLayer.masksToBounds = true

        // rounded layer
        let roundedLayer = CALayer()
        roundedLayer.shadowColor = UIColor.darkGray.cgColor
        roundedLayer.shadowPath = UIBezierPath(roundedRect: CGRect(x: 0, y: 0, width: dimension, height: dimension), cornerRadius: radius).cgPath
        roundedLayer.shadowOffset = CGSize(width: offset, height: offset)
        roundedLayer.shadowOpacity = 0.8
        roundedLayer.shadowRadius = 2
        roundedLayer.frame = frame

        // views and layers hierarchy
        customView.layer.addSublayer(imageLayer)
        customView.layer.insertSublayer(roundedLayer, below: imageLayer)
        view.addSubview(customView)

        // layout
        customView.center = CGPoint(x: view.bounds.midX, y: view.bounds.midY)
        customView.autoresizingMask = [UIViewAutoresizing.flexibleLeftMargin, .flexibleRightMargin, .flexibleTopMargin, .flexibleBottomMargin]
    }

}

2。使用 UIVIEW , UIImageView , 加莱尔 和自动布局

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // constants
        let radius: CGFloat = 20, dimension: CGFloat = 200, offset = 8

        // image view
        let imageView = UIImageView(image: UIImage(named: "image"))
        imageView.contentMode = .scaleAspectFill
        imageView.layer.cornerRadius = radius
        imageView.layer.masksToBounds = true

        // rounded view
        let roundedView = UIView()
        roundedView.layer.shadowColor = UIColor.darkGray.cgColor
        roundedView.layer.shadowPath = UIBezierPath(roundedRect: CGRect(x: 0, y: 0, width: dimension, height: dimension), cornerRadius: radius).cgPath
        roundedView.layer.shadowOffset = CGSize(width: offset, height: offset)
        roundedView.layer.shadowOpacity = 0.8
        roundedView.layer.shadowRadius = 2

        // views hierarchy
        roundedView.addSubview(imageView)
        view.addSubview(roundedView)

        // layout
        imageView.translatesAutoresizingMaskIntoConstraints = false
        roundedView.translatesAutoresizingMaskIntoConstraints = false
        roundedView.widthAnchor.constraint(equalToConstant: dimension).isActive = true
        roundedView.heightAnchor.constraint(equalToConstant: dimension).isActive = true
        imageView.widthAnchor.constraint(equalTo: roundedView.widthAnchor).isActive = true
        imageView.heightAnchor.constraint(equalTo: roundedView.heightAnchor).isActive = true
        roundedView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
        roundedView.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
        imageView.centerXAnchor.constraint(equalTo: roundedView.centerXAnchor).isActive = true
        imageView.centerYAnchor.constraint(equalTo: roundedView.centerYAnchor).isActive = true
    }

}

两个代码段都会生成以下显示:

您可以找到更多的方法来将图像与圆角和阴影组合在一起。 Github repo .

如果您希望ImageView的阴影层具有角半径是更好的解决方案,请将ImageView视图设置为具有1点边距的子视图。和

 imgBrandLogo.backgroundColor = UIColor.blue
    imgBrandLogo.layer.cornerRadius = imgBrandLogo.frame.height/2
    imgBrandLogo.clipsToBounds = true
    viewBrandLogo.layer.shadowColor = UIColor(rgb:0x262626,alpha:0.24).cgColor
    viewBrandLogo.layer.shadowOffset = CGSize(width: 0, height: 1)
    viewBrandLogo.layer.shadowOpacity = 1
    viewBrandLogo.layer.shadowPath = UIBezierPath(roundedRect:imgBrandLogo.bounds , cornerRadius: imgBrandLogo.frame.height/2).cgPath
    viewBrandLogo.backgroundColor = UIColor.clear.withAlphaComponent(0.0)