[英]UIView with rounded corners and drop shadow?
// corner radius
blueView.layer.cornerRadius = 10
// border
blueView.layer.borderWidth = 1.0
blueView.layer.borderColor = UIColor.black.cgColor
// shadow
blueView.layer.shadowColor = UIColor.black.cgColor
blueView.layer.shadowOffset = CGSize(width: 3, height: 3)
blueView.layer.shadowOpacity = 0.7
blueView.layer.shadowRadius = 4.0
如果有子图层或子视图(如图像)的内容我们想要剪辑到我们的视图边界怎么办?
我们可以用
blueView.layer.masksToBounds = true
(或者, blueView.clipsToBounds = true
给出相同的结果。)
但是,哦不! 阴影也被剪掉了,因为它超出了边界! 该怎么办? 该怎么办?
解决方案
对阴影和边框使用单独的视图。 基础视图是透明的并且有阴影。 边框视图将其具有的任何其他子内容剪辑到其边框。
// add the shadow to the base view
baseView.backgroundColor = UIColor.clear
baseView.layer.shadowColor = UIColor.black.cgColor
baseView.layer.shadowOffset = CGSize(width: 3, height: 3)
baseView.layer.shadowOpacity = 0.7
baseView.layer.shadowRadius = 4.0
// add the border to subview
let borderView = UIView()
borderView.frame = baseView.bounds
borderView.layer.cornerRadius = 10
borderView.layer.borderColor = UIColor.black.cgColor
borderView.layer.borderWidth = 1.0
borderView.layer.masksToBounds = true
baseView.addSubview(borderView)
// add any other subcontent that you want clipped
let otherSubContent = UIImageView()
otherSubContent.image = UIImage(named: "lion")
otherSubContent.frame = borderView.bounds
borderView.addSubview(otherSubContent)
这给出了以下结果:
添加圆角和阴影可能会影响性能。 您可以通过为阴影使用预定义的路径并指定将其光栅化来提高性能。 可以将以下代码添加到上面的示例中。
baseView.layer.shadowPath = UIBezierPath(roundedRect: baseView.bounds, cornerRadius: 10).cgPath
baseView.layer.shouldRasterize = true
baseView.layer.rasterizationScale = UIScreen.main.scale
这个答案是用 Swift 4 和 Xcode 9 测试过的。
以下代码片段向v
,即UIView
添加了边框、边框半径和投影:
// border radius
[v.layer setCornerRadius:30.0f];
// border
[v.layer setBorderColor:[UIColor lightGrayColor].CGColor];
[v.layer setBorderWidth:1.5f];
// drop shadow
[v.layer setShadowColor:[UIColor blackColor].CGColor];
[v.layer setShadowOpacity:0.8];
[v.layer setShadowRadius:3.0];
[v.layer setShadowOffset:CGSizeMake(2.0, 2.0)];
斯威夫特 5 版本:
// border radius
v.layer.cornerRadius = 30.0
// border
v.layer.borderColor = UIColor.lightGray.cgColor
v.layer.borderWidth = 1.5
// drop shadow
v.layer.shadowColor = UIColor.black.cgColor
v.layer.shadowOpacity = 0.8
v.layer.shadowRadius = 3.0
v.layer.shadowOffset = CGSize(width: 2.0, height: 2.0)
您可以调整设置以满足您的需要。
此外,将 QuartzCore 框架添加到您的项目中,然后:
#import <QuartzCore/QuartzCore.h>
笔记
这可能不适用于所有情况。 如果您发现此方法会干扰您正在执行的其他绘图操作,请参阅此答案。
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,您应该使用圆角半径和其他属性设置视图。
之后,只需像这样从viewDidLoad
调用它:
button.addShadow(offset: CGSize.init(width: 0, height: 3), color: UIColor.black, radius: 2.0, opacity: 0.35)
最后结果:
超级简单!
一种方法是将带有圆角的视图放在带有阴影的视图中。
UIView* roundedView = [[UIView alloc] initWithFrame: frame];
roundedView.layer.cornerRadius = 5.0;
roundedView.layer.masksToBounds = YES;
UIView* shadowView = [[UIView alloc] initWithFrame: frame];
shadowView.layer.shadowColor = [UIColor blackColor].CGColor;
shadowView.layer.shadowRadius = 5.0;
shadowView.layer.shadowOffset = CGSizeMake(3.0, 3.0);
shadowView.layer.shadowOpacity = 1.0;
[shadowView addSubview: roundedView];
然后你可以在任何你想要的地方添加 shadowView。
这对我有用。 技巧是将背景颜色从主视图移动到图层。
CALayer *layer = view.layer;
layer.cornerRadius = 15.0f;
layer.masksToBounds = NO;
layer.shadowOffset = CGSizeMake(0, 3);
layer.shadowColor = [[UIColor blackColor] CGColor];
layer.shadowRadius = 2.0f;
layer.shadowOpacity = 0.35f;
layer.shadowPath = [[UIBezierPath bezierPathWithRoundedRect:layer.bounds cornerRadius:layer.cornerRadius] CGPath];
CGColorRef bColor = view.backgroundColor.CGColor;
view.backgroundColor = nil;
layer.backgroundColor = bColor ;
在为容器视图分配阴影路径时,我使用以下技巧解决了这个问题:
[UIBezierPath bezierPathWithRoundedRect:cell.bounds cornerRadius:12]
请注意,给阴影的路径是一个圆角矩形,其角半径与单元格包含的背景相同:
//this is the border for the UIView that is added to a cell
cell.backgroundView.layer.cornerRadius = 12;
cell.backgroundView.layer.masksToBounds = YES;
cell.backgroundView.layer.borderColor = [UIColor darkGrayColor].CGColor;
cell.backgroundView.layer.borderWidth = 1;
//this is the shadow around the cell itself (cannot have round corners with borders and shadow, need to use two views
cell.layer.shadowRadius = 2;
cell.layer.cornerRadius = 12;
cell.layer.masksToBounds = NO;
[[cell layer] setShadowColor:[[UIColor darkGrayColor] CGColor]];
[[cell layer] setShadowOffset:CGSizeMake(0.0,0.0)];
[[cell layer] setShadowOpacity:1.0];
UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:cell.bounds cornerRadius:12];
[[cell layer] setShadowPath:[path CGPath]];
如果你是因为圆的挣扎corners
与subviews
与masksToBounds
,然后尝试使用我的功能:
- (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;
}
根据您的观点调用它。 无论您的视图是否有圆角,无论其大小、形状如何 - 都会绘制一个漂亮的阴影。
只需保留函数的返回值,以便在要删除表时引用它(或例如使用insertSubview:aboveView:
)
使用 Swift 4 和 Xcode 9 ,这是一个使用投影和边框四舍五入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)
如果您希望图像是圆形的:(并且不带边框显示)
let cornerRadius = imageWidth / 2
您需要使用使用shadowView
和roundView
阴影视图
roundView
后面shadowView
,它的阴影需要发光。 调整insets
使shadowView
在roundView
后面完全不可见圆形视图
代码
addSubviews(shadowView, roundView)
roundView.addSubviews(titleLabel, subtitleLabel, imageView)
// need inset
shadowView.pinEdges(view: self, inset: UIEdgeInsets(constraintInsets: 2))
roundView.pinEdges(view: self)
do {
shadowView.backgroundColor = .white // need background
let layer = shadowView.layer
layer.shadowColor = UIColor.black.cgColor
layer.shadowRadius = 3
layer.shadowOffset = CGSize(width: 3, height: 3)
layer.shadowOpacity = 0.7
layer.shouldRasterize = true
}
do {
roundView.backgroundColor = .white
let layer = roundView.layer
layer.masksToBounds = true
layer.cornerRadius = 5
}
或者您可以在不指定clipToBounds/maskToBounds
情况下执行以下clipToBounds/maskToBounds
layer.shadowColor = UIColor.gray.cgColor
layer.shadowOffset = CGSize(width: 3, height: 3)
layer.shadowOpacity = 0.8
我在 UIView 上创建了一个助手
@interface UIView (Helper)
- (void)roundCornerswithRadius:(float)cornerRadius
andShadowOffset:(float)shadowOffset;
@end
你可以这样称呼它
[self.view roundCornerswithRadius:5 andShadowOffset:5];
这是实现
- (void)roundCornerswithRadius:(float)cornerRadius
andShadowOffset:(float)shadowOffset
{
const float CORNER_RADIUS = cornerRadius;
const float SHADOW_OFFSET = shadowOffset;
const float SHADOW_OPACITY = 0.5;
const float SHADOW_RADIUS = 3.0;
UIView *superView = self.superview;
CGRect oldBackgroundFrame = self.frame;
[self removeFromSuperview];
CGRect frameForShadowView = CGRectMake(0, 0, oldBackgroundFrame.size.width, oldBackgroundFrame.size.height);
UIView *shadowView = [[UIView alloc] initWithFrame:frameForShadowView];
[shadowView.layer setShadowOpacity:SHADOW_OPACITY];
[shadowView.layer setShadowRadius:SHADOW_RADIUS];
[shadowView.layer setShadowOffset:CGSizeMake(SHADOW_OFFSET, SHADOW_OFFSET)];
[self.layer setCornerRadius:CORNER_RADIUS];
[self.layer setMasksToBounds:YES];
[shadowView addSubview:self];
[superView addSubview:shadowView];
}
在 swift 4 中快速测试的东西
import UIKit
extension UIView {
@IBInspectable var dropShadow: Bool {
set{
if newValue {
layer.shadowColor = UIColor.black.cgColor
layer.shadowOpacity = 0.4
layer.shadowRadius = 1
layer.shadowOffset = CGSize.zero
} else {
layer.shadowColor = UIColor.clear.cgColor
layer.shadowOpacity = 0
layer.shadowRadius = 0
layer.shadowOffset = CGSize.zero
}
}
get {
return layer.shadowOpacity > 0
}
}
}
生产
如果您在 Inspector 中启用它,如下所示:
它将添加用户定义的运行时属性,导致:
(我之前添加了cornerRadius = 8
)
:)
经过一整天的阴影圆角视图研究,我很高兴在这里发布我的自定义uiview类,希望结束这个问题:
#import <UIKit/UIKit.h>
@interface RoundCornerShadowView : UIView
@end
#import "RoundCornerShadowView.h"
@implementation RoundCornerShadowView
// *** must override this method, not the other method ***
// otherwise, the background corner doesn't disappear....
// @2015/05/29
-(void) layoutSubviews {
[super layoutSubviews];//is must to ensure rightly layout children view
//1. first, create Inner layer with content
CALayer *innerView = [CALayer layer];
innerView.frame = CGRectMake(0,0,self.bounds.size.width,self.bounds.size.height);
//instead of: innerView.frame = self.frame;
innerView.borderWidth = 1.0f;
innerView.cornerRadius = 6.0f;
innerView.masksToBounds = YES;
innerView.borderColor = [[UIColor lightGrayColor] CGColor];
innerView.backgroundColor = [[UIColor whiteColor] CGColor];
//put the layer to the BOTTOM of layers is also a MUST step...
//otherwise this layer will overlay the sub uiviews in current uiview...
[self.layer insertSublayer:innerView atIndex:0];
//2. then, create shadow with self layer
self.layer.masksToBounds = NO;
self.layer.shadowColor = [[UIColor darkGrayColor] CGColor];
self.layer.shadowOpacity = 0.4f;
//shadow length
self.layer.shadowRadius = 2.0f;
//no offset
self.layer.shadowOffset = CGSizeMake(0, 0);
//right down shadow
//[self.layer setShadowOffset: CGSizeMake(1.0f, 1.0f)];
//3. last but important, MUST clear current view background color, or the color will show in the corner!
self.backgroundColor = [UIColor clearColor];
}
@end
因此,无需在目标视图中或视图下方添加子视图,只需在当前视图中添加一层,然后执行 3 步即可完成!
仔细看看代码中的注释,对理解组件很有帮助!
Swift 3 和 IBInspectable 解决方案:
灵感来自 Ade 的解决方案
首先,创建一个 UIView 扩展:
//
// UIView-Extension.swift
//
import Foundation
import UIKit
@IBDesignable
extension UIView {
// Shadow
@IBInspectable var shadow: Bool {
get {
return layer.shadowOpacity > 0.0
}
set {
if newValue == true {
self.addShadow()
}
}
}
fileprivate func addShadow(shadowColor: CGColor = UIColor.black.cgColor, shadowOffset: CGSize = CGSize(width: 3.0, height: 3.0), shadowOpacity: Float = 0.35, shadowRadius: CGFloat = 5.0) {
let layer = self.layer
layer.masksToBounds = false
layer.shadowColor = shadowColor
layer.shadowOffset = shadowOffset
layer.shadowRadius = shadowRadius
layer.shadowOpacity = shadowOpacity
layer.shadowPath = UIBezierPath(roundedRect: layer.bounds, cornerRadius: layer.cornerRadius).cgPath
let backgroundColor = self.backgroundColor?.cgColor
self.backgroundColor = nil
layer.backgroundColor = backgroundColor
}
// Corner radius
@IBInspectable var circle: Bool {
get {
return layer.cornerRadius == self.bounds.width*0.5
}
set {
if newValue == true {
self.cornerRadius = self.bounds.width*0.5
}
}
}
@IBInspectable var cornerRadius: CGFloat {
get {
return self.layer.cornerRadius
}
set {
self.layer.cornerRadius = newValue
}
}
// Borders
// Border width
@IBInspectable
public var borderWidth: CGFloat {
set {
layer.borderWidth = newValue
}
get {
return layer.borderWidth
}
}
// Border color
@IBInspectable
public var borderColor: UIColor? {
set {
layer.borderColor = newValue?.cgColor
}
get {
if let borderColor = layer.borderColor {
return UIColor(cgColor: borderColor)
}
return nil
}
}
}
然后,只需在界面构建器中选择您的 UIView 设置shadow ON和corner radius ,如下所示:
结果!
这是 maskToBounds 冲突问题的解决方案,它对我有用。
在设置了corderRadius/borderColor/shadow 等之后,将masksToBounds 设置为NO:
v.layer.masksToBounds = NO;
阴影 + 边框 + 角半径
scrollview.backgroundColor = [UIColor whiteColor];
CALayer *ScrlViewLayer = [scrollview layer];
[ScrlViewLayer setMasksToBounds:NO ];
[ScrlViewLayer setShadowColor:[[UIColor lightGrayColor] CGColor]];
[ScrlViewLayer setShadowOpacity:1.0 ];
[ScrlViewLayer setShadowRadius:6.0 ];
[ScrlViewLayer setShadowOffset:CGSizeMake( 0 , 0 )];
[ScrlViewLayer setShouldRasterize:YES];
[ScrlViewLayer setCornerRadius:5.0];
[ScrlViewLayer setBorderColor:[UIColor lightGrayColor].CGColor];
[ScrlViewLayer setBorderWidth:1.0];
[ScrlViewLayer setShadowPath:[UIBezierPath bezierPathWithRect:scrollview.bounds].CGPath];
这是我在 Swift 3 中的 UIView 版本
let corners:UIRectCorner = [.bottomLeft, .topRight]
let path = UIBezierPath(roundedRect: rect, byRoundingCorners: corners, cornerRadii: CGSize(width: radius, height: radius))
let mask = CAShapeLayer()
mask.path = path.cgPath
mask.fillColor = UIColor.white.cgColor
let shadowLayer = CAShapeLayer()
shadowLayer.shadowColor = UIColor.black.cgColor
shadowLayer.shadowOffset = CGSize(width: 0.0, height: 4.0)
shadowLayer.shadowRadius = 6.0
shadowLayer.shadowOpacity = 0.25
shadowLayer.shadowPath = mask.path
self.layer.insertSublayer(shadowLayer, at: 0)
self.layer.insertSublayer(mask, at: 1)
Swift 4: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..
我创建了带有所需边缘的 UIView 扩展来应用阴影,如下所示
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,您可以为任何 UIView 子类调用如下阴影函数,您还可以指定要应用阴影的边缘,根据需要更改以下方法调用的参数尝试不同的变化。
viewRoundedToBeShadowedAsWell.applyShadowWithCornerRadius(color: .gray, opacity: 1, radius: 15, edge: AIEdge.All, shadowSpace: 15)
注意:如果仍然不起作用,请尝试从主线程调用它
DispatchQueue.main.async {
viewRoundedToBeShadowedAsWell.applyShadowWithCornerRadius(color: .gray, opacity: 1, radius: 15, edge: AIEdge.All, shadowSpace: 15)
}
希望有人觉得这很有用!
下面是结果图像:
好吧,如果您不想按照 David C 的建议更改笔尖和查看层次结构。此方法将为您完成。 要将圆角和阴影添加到 UIImageView 只需使用此方法,例如:
[Utils roundCornersForImageView:myImageView withCornerRadius:6.0
andShadowOffset:2.0];
(!) 出于性能原因,我认为在 UITableView 之类的东西中使用此代码不是一个好主意,因为此代码更改了视图层次结构。 所以我会建议改变你的笔尖并为阴影效果添加一个容器视图并使用 Davic C. 代码。
+ (void)roundCornersForImageView:(UIImageView *)imageView
withCornerRadius:(float)cornerRadius andShadowOffset:(float)shadowOffset
{
const float CORNER_RADIUS = cornerRadius;
const float BORDER_WIDTH = 1.0;
const float SHADOW_OFFSET = shadowOffset;
const float SHADOW_OPACITY = 0.8;
const float SHADOW_RADIUS = 3.0;
//Our old image now is just background image view with shadow
UIImageView *backgroundImageView = imageView;
UIView *superView = backgroundImageView.superview;
//Make wider actual visible rect taking into account shadow
//offset
CGRect oldBackgroundFrame = backgroundImageView.frame;
CGRect newBackgroundFrame = CGRectMake(oldBackgroundFrame.origin.x, oldBackgroundFrame.origin.y, oldBackgroundFrame.size.width + SHADOW_OFFSET, oldBackgroundFrame.size.height + SHADOW_OFFSET);
[backgroundImageView removeFromSuperview];
backgroundImageView.frame = newBackgroundFrame;
//Make new UIImageView with rounded corners and put our old image
CGRect frameForRoundedImageView = CGRectMake(0, 0, oldBackgroundFrame.size.width, oldBackgroundFrame.size.height);
UIImageView *roundedImageView = [[UIImageView alloc]initWithFrame:frameForRoundedImageView];
roundedImageView.image = imageView.image;
[roundedImageView.layer setCornerRadius:CORNER_RADIUS];
[roundedImageView.layer setBorderColor:[UIColor lightGrayColor].CGColor];
[roundedImageView.layer setBorderWidth:BORDER_WIDTH];
[roundedImageView.layer setMasksToBounds:YES];
//Set shadow preferences
[backgroundImageView setImage:nil];
[backgroundImageView.layer setShadowColor:[UIColor blackColor].CGColor];
[backgroundImageView.layer setShadowOpacity:SHADOW_OPACITY];
[backgroundImageView.layer setShadowRadius:SHADOW_RADIUS];
[backgroundImageView.layer setShadowOffset:CGSizeMake(SHADOW_OFFSET, SHADOW_OFFSET)];
//Add out two image views back to the view hierarchy.
[backgroundImageView addSubview:roundedImageView];
[superView addSubview:backgroundImageView];
}
旧线程仍然有效...
我已经编辑了 Daniel Gindi 的方法,使其也可以与按钮等一起使用。 如果有人需要圆角或想要组合圆角和边框,则必须在传递给此方法的视图层上设置它。 我还设置了光栅化以加快速度。
+ (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;
}
以下对我来说效果最好(这段代码位于 UIView 扩展中,所以 self 表示一些我们必须添加阴影和圆角的 UIView)
- (void)addShadowViewWithCornerRadius:(CGFloat)radius {
UIView *container = self.superview;
if (!container) {
return;
}
UIView *shadowView = [[UIView alloc] init];
shadowView.translatesAutoresizingMaskIntoConstraints = NO;
shadowView.backgroundColor = [UIColor lightGrayColor];
shadowView.layer.cornerRadius = radius;
shadowView.layer.masksToBounds = YES;
[container addSubview:shadowView];
[container bringSubviewToFront:shadowView];
[container addConstraint:[NSLayoutConstraint constraintWithItem:shadowView
attribute:NSLayoutAttributeWidth
relatedBy:NSLayoutRelationEqual
toItem:self
attribute:NSLayoutAttributeWidth
multiplier:1.0
constant:0.0]];
[container addConstraint:[NSLayoutConstraint constraintWithItem:shadowView
attribute:NSLayoutAttributeLeading
relatedBy:NSLayoutRelationEqual
toItem:self
attribute:NSLayoutAttributeLeading
multiplier:1.0
constant:2.0]];
[container addConstraint:[NSLayoutConstraint constraintWithItem:shadowView
attribute:NSLayoutAttributeHeight
relatedBy:NSLayoutRelationEqual
toItem:self
attribute:NSLayoutAttributeHeight
multiplier:1.0
constant:0.0]];
[container addConstraint:[NSLayoutConstraint constraintWithItem:shadowView
attribute:NSLayoutAttributeTop
relatedBy:NSLayoutRelationEqual
toItem:self
attribute:NSLayoutAttributeTop
multiplier:1.0
constant:2.0]];
[container sendSubviewToBack:shadowView];
}
此代码示例与其他代码示例之间的主要区别在于,它将阴影视图添加为兄弟视图(而不是将当前视图添加为阴影视图的子视图),从而无需以任何方式修改现有视图层次结构。
用于使 UICollectionViewCell 变圆并添加阴影的Swift 4解决方案,没有任何扩展和复杂性:)
注意:对于简单的视图,例如按钮。 请参阅这篇文章中的@suragch 的回答。 https://stackoverflow.com/a/34984063/7698092 。 按钮测试成功
以防万一有人仍在努力绕过角落并同时添加阴影。 尽管此解决方案适用于 UICollectionViewCell,但它可以推广到任何视图。
这项技术对我有用,无需进行任何扩展和所有复杂的事情。 我正在使用故事板。
技术
您必须在 storyBoard 的 UICollectionViewCell 中添加一个 UIView(可以说是“containerView”),并在这个 containerView 中添加所有必需的视图(按钮、图像等)。 请参阅屏幕截图。
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
daniel.gindi 上面的回答对我有用! (+1 daniel) 但是,我必须进行细微调整 - 将 shadowFrame 大小更改为与视图的帧大小相同,并启用用户交互。 这是更新后的代码:
+ (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;
}
我想补充一点,在我的情况下,我试图将它添加到 3rd 方视图控制器,即我没有直接控制代码。 所以,这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;
我对 daniel.gindi 的代码做了一些改动
这就是让它工作所需的全部内容。
+ (void)putView:(UIView*)view insideShadowWithColor:(UIColor*)color andBlur: (CGFloat)blur andOffset:(CGSize)shadowOffset andOpacity:(CGFloat)shadowOpacity
{
CGRect shadowFrame = view.frame;
UIView * shadow = [[UIView alloc] initWithFrame:shadowFrame];
shadow.backgroundColor = [UIColor redColor];
shadow.userInteractionEnabled = YES; // Modify this if needed
shadow.layer.shadowColor = color.CGColor;
shadow.layer.shadowOffset = shadowOffset;
shadow.layer.shadowRadius = blur;
shadow.layer.cornerRadius = view.layer.cornerRadius;
shadow.layer.masksToBounds = NO;
shadow.clipsToBounds = NO;
shadow.layer.shadowOpacity = shadowOpacity;
[view.superview insertSubview:shadow belowSubview:view];
}
您需要使用两个UIViews
来实现这一点。 一个UIView
将像阴影一样工作,另一个将用于圆角边框。
这是一个借助protocol
的Class Method
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@required
委托方法,它将在按钮单击时触发。
在这里,我向UIViewController
添加了一个按钮,如下所示:
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];
结果将如下所示:
我从这篇文章中尝试了很多解决方案,最终得到了以下解决方案。 这是完整的证明解决方案,除非您需要在清晰的彩色视图上添加阴影。
- (void)addShadowWithRadius:(CGFloat)shadowRadius withOpacity:(CGFloat)shadowOpacity withOffset:(CGSize)shadowOffset withColor:(UIColor *)shadowColor withCornerradius:(CGFloat)cornerRadius
{
UIView *viewShadow = [[UIView alloc]initWithFrame:self.frame];
viewShadow.backgroundColor = [UIColor whiteColor];
viewShadow.layer.shadowColor = shadowColor.CGColor;
viewShadow.layer.shadowOffset = shadowOffset;
viewShadow.layer.shadowRadius = shadowRadius;
viewShadow.layer.shadowOpacity = shadowOpacity;
viewShadow.layer.cornerRadius = cornerRadius;
viewShadow.layer.masksToBounds = NO;
[self.superview insertSubview:viewShadow belowSubview:self];
[viewShadow setTranslatesAutoresizingMaskIntoConstraints:NO];
[self.superview addConstraint:[NSLayoutConstraint constraintWithItem:viewShadow attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeWidth multiplier:1.0 constant:0]];
[self.superview addConstraint:[NSLayoutConstraint constraintWithItem:viewShadow attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeHeight multiplier:1.0 constant:0]];
[self.superview addConstraint:[NSLayoutConstraint constraintWithItem:viewShadow attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:viewShadow attribute:NSLayoutAttributeCenterX multiplier:1.0 constant:0]];
[self.superview addConstraint:[NSLayoutConstraint constraintWithItem:viewShadow attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:viewShadow attribute:NSLayoutAttributeCenterY multiplier:1.0 constant:0]];
[self layoutIfNeeded];
self.layer.cornerRadius = cornerRadius;
self.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)
}
}
Evan Mulawski 提供的答案将完美地工作。 问题是您必须将视图的背景颜色设置为 clearColor 并将 maskToBounds 属性设置为 NO。
您可以为视图设置任何您想要的颜色,将其设置为
v.layer.backgroundColor = your color;
希望这可以帮助..
这就是你如何做到的,圆角和圆角阴影而不用打扰路径。
//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,有一个圆角半径,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,将它的 maskToBounds 设置为 NO,然后将内容视图添加到容器视图(例如 shadowContainer)。
我写了这个 UIView 类别方法来解决这个问题,对阴影和角半径使用单独的视图。
-(UIView *)shadowedWrapViewWithBounds:(CGRect)bounds {
UIView *baseView = [[UIView alloc] init];
baseView.bounds = bounds;
baseView.backgroundColor = [UIColor clearColor];
baseView.layer.shadowColor = [UIColor blackColor].CGColor;
baseView.layer.shadowOffset = CGSizeMake(0, 0);
baseView.layer.shadowOpacity = 0.7;
baseView.layer.shadowRadius = 4.0;
// improve performance
baseView.layer.shadowPath = [UIBezierPath bezierPathWithRoundedRect:baseView.bounds cornerRadius:4].CGPath;
baseView.layer.shouldRasterize = YES;
baseView.layer.rasterizationScale = [UIScreen mainScreen].scale;
[baseView addSubview:self];
//use Masonry autolayout, self can set corner radius
[self makeConstraints:^(MASConstraintMaker *make) {
make.edges.equalTo(baseView);
}];
return baseView;
}
您需要添加masksToBounds = true
才能在corderRadius
shadowRadius
之间进行组合。
button.layer.masksToBounds = false;
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)
}
}
}
iOS 阴影和角半径
您可以使用layer
设置阴影
view1.layer.shadowColor = UIColor.magenta.cgColor
view1.layer.shadowOffset = CGSize(width: 0, height: 0)
view1.layer.shadowOpacity = 1
view1.layer.shadowRadius = 0
可视化
1.shadowOffset.width,2.shadowOffset.height,3.shadowOpacity,4.shadowRadius
shadowOpacity
是从 0 到 1shadowRadius
从 0 开始为正不简单的任务
请注意,阴影不是仅基于boundaries
和cornerRaduis
计算的。 在创建阴影期间,会考虑下一个项目:
content
( Backing Image
)view1.backgroundColor = .clear
view1.layer.contents = UIImage(named: "ring")?.cgImage
view1.layer.contentsScale = UIScreen.main.scale
ScaleFactor ( contentsScale
, rasterizationScale
) - 默认为 1.0
currentBitmapSize = layerSize * scaleFactor
//non retina
1 point == 1x pixels
//Retina
1 point == 2x pixels
//or
1 point == 3x pixels
//For example to draw line
point(width: 4, height: 2) == 1x pixels(width: 4, height: 2)(8 pixels) == 2x pixels(width: 8, height: 4)(32 pixels)
使用UIScreen.main.scale
= 当前屏幕的比例因子
性能
使用layer.cornerRadius
, shadow
有一些性能影响
Xcode 提示您:
The layer is using dynamic shadows which are expensive to render. If possible try setting shadowPath, or pre-rendering the shadow into an image and putting it under the layer
1.使用shadowPath
对于内部 static 层。 默认情况下它是nil
这就是为什么 UIKit 应该创建屏幕外视图并基于此信息创建阴影。 这就是为什么您能够预定义路径并设置它的原因。 另一个优点是您可以根据需要创建自定义阴影
view1.layer.shadowPath = UIBezierPath(roundedRect: view1.bounds, cornerRadius: 50).cgPath
缺点- 不是动态的。 如果视图更改边界(宽度、高度、角半径...),阴影将保持原样。 它不中继移动
2.缓存光栅化
shouldRasterize = true
。 对于内部 static 层,将被移动(滚动等)。 UIKit预渲染屏幕外视图(将考虑所有子图层和子视图,并创建单个bitmap,之后将应用所有其他效果(如不透明度......)并将其保存到 RAM(直到需要更新),当层的 position 改变时 - UIKit 直接从 RAM 读取它(缓存层)(无需从头开始渲染(这不是简单的任务,例如计算颜色混合层......))
shouldRasterize = true
将焦点从 GPU 移动到 RAM,这需要在开始时进行一些额外的工作,但在使用过程中会出现错误
view1.layer.shouldRasterize = true
view1.layer.rasterizationScale = UIScreen.main.scale
缺点- 不是动态的。 如果视图更改边界(宽度、高度、cornerRadius、颜色、内部内容...) shouldRasterize = true
会产生额外的工作来反映性能
var shadows = UIView()
shadows.frame = view.frame
shadows.clipsToBounds = false
view.addSubview(shadows)
let shadowPath0 = UIBezierPath(roundedRect: shadows.bounds, cornerRadius: 10)
let layer0 = CALayer()
layer0.shadowPath = shadowPath0.cgPath
layer0.shadowColor = UIColor(red: 0, green: 0, blue: 0, alpha: 0.23).cgColor
layer0.shadowOpacity = 1
layer0.shadowRadius = 6
layer0.shadowOffset = CGSize(width: 0, height: 3)
layer0.bounds = shadows.bounds
layer0.position = shadows.center
shadows.layer.addSublayer(layer0)
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.