使用 Swift 3,您可以选择以下两个代码片段之一,以便在图像视图或包含图像层的视图上设置cornerRadius 和阴影。
#1。使用UIView
,CALayer
和 Spring 和 Struts
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
和CALayer
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
}
}
两个代码片段都生成以下显示:
你可以在这个Github repo上找到更多将图像与圆角和阴影结合起来的方法。