UIView左侧和右侧的阴影
UIView左侧和右侧的阴影
提问于 2013-01-09 00:19:53
您好，我喜欢添加一个CALayer阴影到一个视图，其中的阴影是视图的左右，最简单的方法是：
someView.layer.shadowColor = [[UIColor blackColor] CGColor];
someView.layer.shadowOffset = CGSizeMake(0.0f,0.0f);
someView.layer.shadowOpacity = 1.0f;
someView.layer.shadowRadius = 10.0f;
someView.layer.shadowPath = [[UIBezierPath bezierPathWithRect:someView.bounds] CGPath];但我会添加一个更大的阴影，因为当我增加shadowRadius时，它看起来不太好。我怎样才能使阴影在左右两边看起来都很好。
Stack Overflow用户
发布于 2021-05-06 02:24:26
我创建了一个阴影，可以在顶部/底部或左侧/右侧使用，完全没有偏见。如果选择顶部/底部，则不会在左侧/右侧显示阴影，依此类推。我希望我能帮上忙。代码如下：
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let imgView = UIImageView(frame: CGRect(x: self.view.bounds.midX - 150, y: self.view.bounds.midY - 150, width: 300, height: 300))
imgView.contentMode = .scaleToFill
imgView.image = UIImage(named: "name image")
self.view.addSubview(imgView)
//You can put left/right or top/bottom
imgView.addShadow(sides: .leftRight, constant: 10, alpha: 5)
}
}
extension UIView{
func addShadow(sides: Sides, constant: Int, alpha: Int){
if(constant > 0 && alpha > 0){
switch sides {
case .leftRight:
let view = UIView(frame: CGRect(x: -CGFloat(constant), y: 0, width: self.bounds.width + CGFloat((constant * 2)), height: self.bounds.height))
self.addSubview(view)
addMask(sides: .leftRight, view: view, constant: constant, shadowRadius: alpha)
case .topBottom:
let view = UIView(frame: CGRect(x: 0, y: -CGFloat(constant), width: self.bounds.width , height: self.bounds.height + CGFloat(constant * 2)))
self.addSubview(view)
addMask(sides: .topBottom, view: view, constant: constant, shadowRadius: alpha)
}
}
}
private func addMask(sides:Sides, view: UIView, constant: Int, shadowRadius:Int){
let mutablePath = CGMutablePath()
let mask = CAShapeLayer()
switch sides {
case .leftRight:
mutablePath.addRect(CGRect(x: -CGFloat(constant), y: 0, width: view.bounds.width, height: view.bounds.height))
mutablePath.addRect(CGRect(x: CGFloat(constant) , y: 0, width: view.bounds.width , height: view.bounds.height))
case .topBottom:
mutablePath.addRect(CGRect(x: 0, y: -CGFloat(constant), width: view.bounds.width, height: view.bounds.height))
mutablePath.addRect(CGRect(x: 0, y: CGFloat(constant) , width: view.bounds.width , height: view.bounds.height))
}
mask.path = mutablePath
mask.fillRule = CAShapeLayerFillRule.evenOdd
mask.fillColor = UIColor(white:1.0, alpha: 0.2).cgColor
view.layer.mask = mask
view.layer.addSublayer(mask)
mask.shadowColor = UIColor.black.cgColor
mask.shadowRadius = CGFloat(shadowRadius)
mask.shadowOpacity = 1.0
mask.shadowOffset = CGSize(width: 0, height: 0)
}
}
enum Sides{
case leftRight
case topBottom
}您只需调用扩展UIView，它具有addShadow()函数并传递所需的参数。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/14219412
复制相关文章
相似问题
腾讯云开发者
