在swift4中向UIView添加云阴影
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【中文标题】在swift4中向UIView添加云阴影【英文标题】:Adding clouded shadow to UIView in swift4 【发布时间】:2017-11-22 15:29:43 【问题描述】:我想为我的 UIView 添加阴影(它不像默认的那样模糊不清),如下所示
我写了一个扩展为
func addShadow(color: UIColor = UIColor.black, opacity: Float = 0.9, radius: CGFloat = 1, scale: Bool = true)
self.layer.masksToBounds = false
self.layer.shadowColor = color.cgColor
self.layer.shadowOpacity = opacity
self.layer.shadowRadius = radius
self.layer.shadowPath = UIBezierPath(rect: self.bounds).cgPath
self.layer.shouldRasterize = true
self.layer.rasterizationScale = scale ? UIScreen.main.scale : 1
输出:
但无法获得准确的输出。 您的帮助将不胜感激。
【问题讨论】:
How do I draw a shadow under a UIView?的可能重复self.layer.shadowOffset = CGSizeMake(0, -??)
应该可以解决问题,在哪里 -??是根据您的需要进行测试...
您的shadowPath
是一个矩形。
是的,我怎么能得到它的阴天
【参考方案1】:
相信你也需要设置clipsToBounds
。
self.clipsToBounds = false
【讨论】:
【参考方案2】:我使用 IBInspectable 来处理我的应用程序中的所有视图。试试看
extension UIView
@IBInspectable var cornerRadius: CGFloat
set
layer.cornerRadius = newValue
get
return layer.cornerRadius
@IBInspectable var borderWidth: CGFloat
set
layer.borderWidth = newValue
get
return layer.borderWidth
@IBInspectable var borderColor: UIColor?
set
layer.borderColor = newValue?.cgColor
get
return UIColor(cgColor: layer.borderColor!)
@IBInspectable var shadowOffset: CGSize
set
layer.shadowOffset = newValue
get
return layer.shadowOffset
@IBInspectable var shadowOpacity: Float
set
layer.shadowOpacity = newValue
get
return layer.shadowOpacity
@IBInspectable var shadowRadius: CGFloat
set
layer.shadowRadius = newValue
get
return layer.shadowRadius
@IBInspectable var shadowColor: UIColor?
set
layer.shadowColor = newValue?.cgColor
get
return UIColor(cgColor: layer.shadowColor!)
在您的情况下,您应该修复 shadowOffset 属性。
【讨论】:
这种方式看起来很棒,但没有和我合作【参考方案3】:您应该在“containerView”(将阴影放置视图放置为子视图的视图)中禁用 clipToBounds
看一个例子:
import UIKit
extension UIView
func addShadow(color: UIColor = UIColor.black, opacity: Float = 0.9, radius: CGFloat = 1, scale: Bool = true)
self.layer.masksToBounds = false
self.layer.shadowColor = color.cgColor
self.layer.shadowOpacity = opacity
self.layer.shadowRadius = radius
self.layer.shadowPath = UIBezierPath(rect: self.bounds).cgPath
self.layer.shouldRasterize = true
self.layer.rasterizationScale = scale ? UIScreen.main.scale : 1
let shadowedView = UIView(frame: CGRect(x: 50, y: 50, width: 200, height: 100))
shadowedView.backgroundColor = .blue
shadowedView.layer.cornerRadius = 15.0
shadowedView.addShadow()
let mainView = UIView(frame: CGRect(x: 0, y: 0, width: 300, height:200))
mainView.backgroundColor = .white
mainView.addSubview(shadowedView)
这里我将添加一个视图容器并启用 clipToBounds :
let shadowedView = UIView(frame: CGRect(x: 0, y: 0, width: 200, height: 100))
shadowedView.backgroundColor = .blue
shadowedView.layer.cornerRadius = 15.0
shadowedView.addShadow()
let containerView = UIView(frame: CGRect(x: 50, y: 50, width: 200, height: 100))
containerView.addSubview(shadowedView)
containerView.clipsToBounds = true
let mainView = UIView(frame: CGRect(x: 0, y: 0, width: 300, height: 200))
mainView.backgroundColor = .white
mainView.addSubview(containerView)
【讨论】:
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