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。
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
Evan Mulawski提供的答案将会非常有效。问题是你必须将视图的背景色设置为clearColor,并将masksToBounds属性设置为NO。
你可以为视图设置任何你想要的颜色
v.layer.backgroundColor = your color;
希望这能有所帮助。
其他回答
你需要使用两个uiview来实现这一点。一个UIView会像阴影一样工作,另一个会为圆角边界工作。
下面是一个在协议帮助下的类方法的代码片段:
@implementation UIMethods
+ (UIView *)genComposeButton:(UIViewController <UIComposeButtonDelegate> *)observer;
{
UIView *shadow = [[UIView alloc]init];
shadow.layer.cornerRadius = 5.0;
shadow.layer.shadowColor = [[UIColor blackColor] CGColor];
shadow.layer.shadowOpacity = 1.0;
shadow.layer.shadowRadius = 10.0;
shadow.layer.shadowOffset = CGSizeMake(0.0f, -0.5f);
UIButton *btnCompose = [[UIButton alloc]initWithFrame:CGRectMake(0, 0,60, 60)];
[btnCompose setUserInteractionEnabled:YES];
btnCompose.layer.cornerRadius = 30;
btnCompose.layer.masksToBounds = YES;
[btnCompose setImage:[UIImage imageNamed:@"60x60"] forState:UIControlStateNormal];
[btnCompose addTarget:observer action:@selector(btnCompose_click:) forControlEvents:UIControlEventTouchUpInside];
[shadow addSubview:btnCompose];
return shadow;
}
在上面的代码中,btnCompose_click:将成为一个@required委托方法,该方法将在单击按钮时触发。
在这里我添加了一个按钮到我的UIViewController,像这样:
UIView *btnCompose = [UIMethods genComposeButton:self];
btnCompose.frame = CGRectMake(self.view.frame.size.width - 75,
self.view.frame.size.height - 75,
60, 60);
[self.view addSubview:btnCompose];
结果如下所示:
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!
extension UIView {
func dropRoundedShadowForAllSides() {
let backgroundView = UIView(frame:self.frame)
let radius = frame.height/2
backgroundView.layer.masksToBounds = false
self.layer.masksToBounds = true
backgroundView.layer.shadowOffset = CGSize(width: 0.0, height: 0.0)
backgroundView.layer.shadowRadius = 4
backgroundView.layer.shadowOpacity = 0.4
let path = UIBezierPath()
// Start at the Top Left Corner + radius distance
path.move(to: CGPoint(x: 2*radius, y: 0.0))
// Move to the Top Right Corner - radius distance
path.addLine(to: CGPoint(x: backgroundView.frame.size.width - radius, y: 0.0))
// Move to top right corner + radius down as curve
let centerPoint1 = CGPoint(x:backgroundView.frame.size.width - radius,y:radius)
path.addArc(withCenter: centerPoint1, radius: radius, startAngle: 3*(.pi/2), endAngle: 0, clockwise: true)
// Move to the Bottom Right Corner - radius
path.addLine(to: CGPoint(x: backgroundView.frame.size.width, y: backgroundView.frame.size.height - radius))
// Move to top right corner + radius left as curve
let centerPoint2 = CGPoint(x:backgroundView.frame.size.width - radius,y:backgroundView.frame.size.height - radius)
path.addArc(withCenter: centerPoint2, radius: radius, startAngle: 0, endAngle: .pi/2, clockwise: true)
// Move to the Bottom Left Corner - radius
path.addLine(to: CGPoint(x: radius, y: backgroundView.frame.size.height))
// Move to left right corner - radius up as curve
let centerPoint3 = CGPoint(x:radius,y:backgroundView.frame.size.height - radius)
path.addArc(withCenter: centerPoint3, radius: radius, startAngle: .pi/2, endAngle: .pi, clockwise: true)
// Move to the top Left Corner - radius
path.addLine(to: CGPoint(x: 0, y: radius))
// Move to top right corner + radius down as curve
let centerPoint4 = CGPoint(x:radius,y:radius)
path.addArc(withCenter: centerPoint4, radius: radius, startAngle: .pi, endAngle: 3 * (.pi/2), clockwise: true)
path.close()
backgroundView.layer.shadowPath = path.cgPath
if let superView = self.superview {
superView.addSubview(backgroundView)
superView.sendSubview(toBack: backgroundView)
superView.bringSubview(toFront: self)
}
}
}
这就是你怎么做的,有圆角和圆角阴影,而不用担心路径。
//Inner view with content
[imageView.layer setBorderColor:[[UIColor lightGrayColor] CGColor]];
[imageView.layer setBorderWidth:1.0f];
[imageView.layer setCornerRadius:8.0f];
[imageView.layer setMasksToBounds:YES];
//Outer view with shadow
UIView* shadowContainer = [[UIView alloc] initWithFrame:imageView.frame];
[shadowContainer.layer setMasksToBounds:NO];
[shadowContainer.layer setShadowColor:[[UIColor blackColor] CGColor]];
[shadowContainer.layer setShadowOpacity:0.6f];
[shadowContainer.layer setShadowRadius:2.0f];
[shadowContainer.layer setShadowOffset: CGSizeMake(0.0f, 2.0f)];
[shadowContainer addSubview:imageView];
带有内容的视图,在我的例子中是UIImageView,有一个角半径,因此必须屏蔽到边界。
我们为阴影创建另一个同样大小的视图,设置它的maskToBounds为NO,然后将内容视图添加到容器视图(例如shadowContainer)。
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)
}
}