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
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)。
其他回答
旧线程仍然当前…
我编辑了Daniel Gindi的方法,使它可以用于按钮等。 如果有人需要圆角,或者想要将圆角和边框结合起来,它必须在视图层上设置,这个视图层被传递给这个方法。我还设置了栅格化来加快一点。
+ (UIView*)putView:(UIView*)view insideShadowWithColor:(CGColorRef)color
andRadius:(CGFloat)shadowRadius
andOffset:(CGSize)shadowOffset
andOpacity:(CGFloat)shadowOpacity
{
// Must have same position like "view"
UIView *shadow = [[UIView alloc] initWithFrame:view.frame];
shadow.layer.contentsScale = [UIScreen mainScreen].scale;
shadow.userInteractionEnabled = YES; // Modify this if needed
shadow.layer.shadowColor = color;
shadow.layer.shadowOffset = shadowOffset;
shadow.layer.shadowRadius = shadowRadius;
shadow.layer.masksToBounds = NO;
shadow.clipsToBounds = NO;
shadow.layer.shadowOpacity = shadowOpacity;
shadow.layer.rasterizationScale = [UIScreen mainScreen].scale;
shadow.layer.shouldRasterize = YES;
[view.superview insertSubview:shadow belowSubview:view];
[shadow addSubview:view];
// Move view to the top left corner inside the shadowview
// ---> Buttons etc are working again :)
view.frame = CGRectMake(0, 0, view.frame.size.width, view.frame.size.height);
return shadow;
}
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)
}
}
Swift 4解决方案,使UICollectionViewCell圆形和添加阴影,没有任何扩展和并发症:)
注意:对于简单的视图,例如按钮。请看这篇文章中的@suragch的回答。 https://stackoverflow.com/a/34984063/7698092。按钮测试成功
以防有人还在努力使角落圆润,同时添加阴影。虽然这个解决方案适用于UICollectionViewCell,但它可以推广到任何视图。
这个技巧对我来说很有效,不需要做任何扩展和所有复杂的事情。我正在使用storyBoard。
技术
你必须在storyBoard的UICollectionViewCell中添加一个UIView(让我们说它是“containerView”),并在这个containerView中添加所有必需的视图(按钮,图像等)。 见截图。
连接containerView的出口。在CellforItemAtIndexPath委托函数中添加以下代码行。
//adds shadow to the layer of cell
cell.layer.cornerRadius = 3.0
cell.layer.masksToBounds = false
cell.layer.shadowColor = UIColor.black.cgColor
cell.layer.shadowOffset = CGSize(width: 0, height: 0)
cell.layer.shadowOpacity = 0.6
//makes the cell round
let containerView = cell.containerView!
containerView.layer.cornerRadius = 8
containerView.clipsToBounds = true
输出
查看模拟器截图
使用Swift 4和Xcode 9,这是一个用投影和边框舍入ImageView的工作示例。
//set dimensions and position of image (in this case, centered)
let imageHeight: CGFloat = 150, imageWidth: CGFloat = 150
let xPosition = (self.view.frame.width / 2) - (imageWidth / 2)
let yPosition = (self.view.frame.height / 2) - (imageHeight / 2)
//set desired corner radius
let cornerRadius: CGFloat = 20
//create container for the image
let imageContainer = UIView(frame: CGRect(x: xPosition, y: yPosition, width: imageWidth, height: imageHeight))
//configure the container
imageContainer.clipsToBounds = false
imageContainer.layer.shadowColor = UIColor.black.cgColor
imageContainer.layer.shadowOpacity = 1
imageContainer.layer.shadowOffset = CGSize(width: 3.0, height: 3.0)
imageContainer.layer.shadowRadius = 5
imageContainer.layer.shadowPath = UIBezierPath(roundedRect: imageContainer.bounds, cornerRadius: cornerRadius).cgPath
//create imageView
let imageView = UIImageView(frame: imageContainer.bounds)
//configure the imageView
imageView.clipsToBounds = true
imageView.layer.cornerRadius = cornerRadius
//add a border (if required)
imageView.layer.borderColor = UIColor.black.cgColor
imageView.layer.borderWidth = 1.0
//set the image
imageView.image = UIImage(named: "bird")
//add the views to the superview
view.addSubview(imageContainer)
imageContainer.addSubview(imageView)
如果你想让图像是圆形的:(并且显示为无边框)
let cornerRadius = imageWidth / 2
如果你因为圆角、子视图和masksToBounds而挣扎,那么尝试使用我的函数:
- (UIView*)putView:(UIView*)view insideShadowWithColor:(UIColor*)color andRadius:(CGFloat)shadowRadius andOffset:(CGSize)shadowOffset andOpacity:(CGFloat)shadowOpacity
{
CGRect shadowFrame; // Modify this if needed
shadowFrame.size.width = 0.f;
shadowFrame.size.height = 0.f;
shadowFrame.origin.x = 0.f;
shadowFrame.origin.y = 0.f;
UIView * shadow = [[UIView alloc] initWithFrame:shadowFrame];
shadow.userInteractionEnabled = NO; // Modify this if needed
shadow.layer.shadowColor = color.CGColor;
shadow.layer.shadowOffset = shadowOffset;
shadow.layer.shadowRadius = shadowRadius;
shadow.layer.masksToBounds = NO;
shadow.clipsToBounds = NO;
shadow.layer.shadowOpacity = shadowOpacity;
[view.superview insertSubview:shadow belowSubview:view];
[shadow addSubview:view];
return shadow;
}
在你的视图中调用它。无论你的视图是否有圆角,无论它的大小,它的形状-一个漂亮的阴影将被绘制出来。
只要保留函数的返回值,这样当你想要删除表时就可以引用它(或者例如使用insertSubview:aboveView:)