我在一个应用程序上工作了几年，收到了一个简单的设计请求:在UIView上圆角并添加投影。做以下所给的事
我想要一个自定义的UIView…:我只是想要一个空白的白色视图与圆角和光滴阴影(没有照明效果)。我可以逐个执行这些操作，但通常会发生clipToBounds/maskToBounds冲突。
当前回答
丹尼尔。Gindi上面的回答对我很有用!然而，我不得不做一些小的调整-改变shadowFrame的大小与视图的帧大小相同，并启用用户交互。以下是更新后的代码:
+ (UIView*)putView:(UIView*)view insideShadowWithColor:(UIColor*)color andRadius:(CGFloat)shadowRadius andOffset:(CGSize)shadowOffset andOpacity:(CGFloat)shadowOpacity
{
CGRect shadowFrame; // Modify this if needed
// Modified this line
shadowFrame.size = CGSizeMake(view.frame.size.width, view.frame.size.height);
shadowFrame.origin.x = 0.f;
shadowFrame.origin.y = 0.f;
UIView * shadow = [[UIView alloc] initWithFrame:shadowFrame];
// Modified this line
shadow.userInteractionEnabled = YES;
shadow.layer.shadowColor = color.CGColor;
shadow.layer.shadowOffset = shadowOffset;
shadow.layer.shadowRadius = shadowRadius;
shadow.layer.masksToBounds = NO;
shadow.clipsToBounds = NO;
shadow.layer.shadowOpacity = shadowOpacity;
[shadow addSubview:view];
return shadow;
}
我想补充的是，在我的情况下，我试图将此添加到第三方视图控制器，即我没有对代码的直接控制。下面是我如何使用上面的函数:
UIView *shadow = [self putView:vc.view
insideShadowWithColor:[UIColor blackColor]
andRadius:5.0
andOffset:CGSizeMake(0.0, 0.0)
andOpacity:1.0];
vc.view = shadow;
vc.view.layer.cornerRadius = 5.0;
vc.view.layer.masksToBounds = YES;
其他回答
检查GitHub上的示例项目，以确保正确使用组件。
简单的Swift 5解决方案，没有任何额外的子视图或子类化:
extension UIView {
func addShadow(offset: CGSize, color: UIColor, radius: CGFloat, opacity: Float) {
layer.masksToBounds = false
layer.shadowOffset = offset
layer.shadowColor = color.cgColor
layer.shadowRadius = radius
layer.shadowOpacity = opacity
let backgroundCGColor = backgroundColor?.cgColor
backgroundColor = nil
layer.backgroundColor = backgroundCGColor
}
}
请注意，在调用addShadow之前，您应该使用角半径和其他属性设置视图。
之后，像这样从viewDidLoad调用这个:
button.addShadow(offset: CGSize.init(width: 0, height: 3), color: UIColor.black, radius: 2.0, opacity: 0.35)
最终结果:
超级简单!
创建UIView的子类
class ShadowView: UIView {
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
// corner radius
self.layer.cornerRadius = 10
// border
self.layer.borderWidth = 1.0
self.layer.borderColor = UIColor.black.cgColor
// shadow
self.layer.shadowColor = UIColor.black.cgColor
self.layer.shadowOffset = CGSize(width: 3, height: 3)
self.layer.shadowOpacity = 0.7
self.layer.shadowRadius = 4.0
}
}
使用. .
丹尼尔。Gindi上面的回答对我很有用!然而，我不得不做一些小的调整-改变shadowFrame的大小与视图的帧大小相同，并启用用户交互。以下是更新后的代码:
+ (UIView*)putView:(UIView*)view insideShadowWithColor:(UIColor*)color andRadius:(CGFloat)shadowRadius andOffset:(CGSize)shadowOffset andOpacity:(CGFloat)shadowOpacity
{
CGRect shadowFrame; // Modify this if needed
// Modified this line
shadowFrame.size = CGSizeMake(view.frame.size.width, view.frame.size.height);
shadowFrame.origin.x = 0.f;
shadowFrame.origin.y = 0.f;
UIView * shadow = [[UIView alloc] initWithFrame:shadowFrame];
// Modified this line
shadow.userInteractionEnabled = YES;
shadow.layer.shadowColor = color.CGColor;
shadow.layer.shadowOffset = shadowOffset;
shadow.layer.shadowRadius = shadowRadius;
shadow.layer.masksToBounds = NO;
shadow.clipsToBounds = NO;
shadow.layer.shadowOpacity = shadowOpacity;
[shadow addSubview:view];
return shadow;
}
我想补充的是，在我的情况下，我试图将此添加到第三方视图控制器，即我没有对代码的直接控制。下面是我如何使用上面的函数:
UIView *shadow = [self putView:vc.view
insideShadowWithColor:[UIColor blackColor]
andRadius:5.0
andOffset:CGSizeMake(0.0, 0.0)
andOpacity:1.0];
vc.view = shadow;
vc.view.layer.cornerRadius = 5.0;
vc.view.layer.masksToBounds = YES;
import UIKit
extension UIView {
func addShadow(shadowColor: UIColor, offSet: CGSize, opacity: Float, shadowRadius: CGFloat, cornerRadius: CGFloat, corners: UIRectCorner, fillColor: UIColor = .white) {
let shadowLayer = CAShapeLayer()
let size = CGSize(width: cornerRadius, height: cornerRadius)
let cgPath = UIBezierPath(roundedRect: self.bounds, byRoundingCorners: corners, cornerRadii: size).cgPath //1
shadowLayer.path = cgPath //2
shadowLayer.fillColor = fillColor.cgColor //3
shadowLayer.shadowColor = shadowColor.cgColor //4
shadowLayer.shadowPath = cgPath
shadowLayer.shadowOffset = offSet //5
shadowLayer.shadowOpacity = opacity
shadowLayer.shadowRadius = shadowRadius
self.layer.addSublayer(shadowLayer)
}
}
这里有一个肯定有效的解决方案!
我已经创建了UIView扩展所需的边应用阴影如下
enum AIEdge:Int {
case
Top,
Left,
Bottom,
Right,
Top_Left,
Top_Right,
Bottom_Left,
Bottom_Right,
All,
None
}
extension UIView {
func applyShadowWithCornerRadius(color:UIColor, opacity:Float, radius: CGFloat, edge:AIEdge, shadowSpace:CGFloat, cornerRadius: CGFloat) {
var sizeOffset:CGSize = CGSize.zero
switch edge {
case .Top:
sizeOffset = CGSize(width: 0, height: -shadowSpace)
case .Left:
sizeOffset = CGSize(width: -shadowSpace, height: 0)
case .Bottom:
sizeOffset = CGSize(width: 0, height: shadowSpace)
case .Right:
sizeOffset = CGSize(width: shadowSpace, height: 0)
case .Top_Left:
sizeOffset = CGSize(width: -shadowSpace, height: -shadowSpace)
case .Top_Right:
sizeOffset = CGSize(width: shadowSpace, height: -shadowSpace)
case .Bottom_Left:
sizeOffset = CGSize(width: -shadowSpace, height: shadowSpace)
case .Bottom_Right:
sizeOffset = CGSize(width: shadowSpace, height: shadowSpace)
case .All:
sizeOffset = CGSize(width: 0, height: 0)
case .None:
sizeOffset = CGSize.zero
}
self.layer.cornerRadius = cornerRadius
self.layer.masksToBounds = true
self.layer.shadowColor = color.cgColor
self.layer.shadowOpacity = opacity
self.layer.shadowOffset = sizeOffset
self.layer.shadowRadius = radius
self.layer.masksToBounds = false
self.layer.shadowPath = UIBezierPath(roundedRect:self.bounds, cornerRadius:self.layer.cornerRadius).cgPath
}
}
最后，你可以为你的UIView子类调用下面的阴影函数，你也可以指定边缘上应用阴影，尝试不同的变化根据你需要改变下面方法调用的参数。
viewRoundedToBeShadowedAsWell.applyShadowWithCornerRadius(color: .gray, opacity: 1, radius: 15, edge: AIEdge.All, shadowSpace: 15)
注意:如果仍然不工作，试着从主线程调用它
DispatchQueue.main.async {
viewRoundedToBeShadowedAsWell.applyShadowWithCornerRadius(color: .gray, opacity: 1, radius: 15, edge: AIEdge.All, shadowSpace: 15)
}
希望有人觉得这有用!
以下是结果图片:
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