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
在研究了一整天的圆角视图与阴影之后,我很高兴在这里发布我的自定义uiview类,希望结束这个问题:
RoundCornerShadowView.h
#import <UIKit/UIKit.h>
@interface RoundCornerShadowView : UIView
@end
RoundCornerShadowView.m
#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
所以,不需要在视图中添加子视图或在目标视图中添加子视图,只需在当前视图中添加一层,并执行3步即可完成!
仔细查看代码中的注释,这有助于理解组件!
其他回答
我对daniel.gindi的代码做了一些修改
这就是你要做的一切。
+ (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];
}
如果你特别想为uibutton定制圆角,有很多不同的方法来实现。
下面的代码示例(感谢Erica)很好地概述了所有可能性。
iOS 15之前的圆角按钮
在iOS 15之前,你可以通过设置图层来制作圆角按钮。cornerRadius, backgroundColor和setTitleColor。
let button = UIButton(type: .system)
button.setTitle("Button", for: .normal)
button.setTitleColor(.white, for: .normal)
button.backgroundColor = .systemPink
button.layer.cornerRadius = 8
button.contentEdgeInsets = UIEdgeInsets(
top: 10,
left: 20,
bottom: 10,
right: 20
)
胶囊按钮
如果我们增加足够大的角半径值,您可以创建一个胶囊风格的按钮。为了创建一个胶囊风格的按钮,我们设置角半径等于按钮高度的一半。由于按钮的高度可能会根据标题大小或布局而变化,我通常为胶囊样式创建一个UIButton子类。
class CapsuleButton: UIButton {
override func layoutSubviews() {
super.layoutSubviews()
let height = bounds.height
layer.cornerRadius = height/2
}
}
let capsule = CapsuleButton(type: .system)
capsule.setTitle("Button", for: .normal)
capsule.setTitleColor(.white, for: .normal)
capsule.backgroundColor = .systemPink
capsule.contentEdgeInsets = UIEdgeInsets(
top: 10,
left: 20,
bottom: 10,
right: 20
)
光滑的角落
如果你想复制苹果平滑角,你也可以用拐角曲线属性来做。要创建连续的平滑角,请设置图层。按钮连续的曲线。
let button = UIButton(type: .system)
button.setTitle("Button", for: .normal)
button.setTitleColor(.white, for: .normal)
button.backgroundColor = .systemPink
button.layer.cornerRadius = 8
button.layer.cornerCurve = .continuous
button.contentEdgeInsets = UIEdgeInsets(
top: 10,
left: 20,
bottom: 10,
right: 20
)
圆角按钮在iOS 15使用UIButton。配置
在iOS 15中,苹果引入了一种通过UIButton.Configuration自定义按钮的新方法。
var configuration = UIButton.Configuration.filled()
configuration.title = "Button"
configuration.baseBackgroundColor = UIColor.systemPink
configuration.contentInsets = NSDirectionalEdgeInsets(
top: 10,
leading: 20,
bottom: 10,
trailing: 20
)
let button = UIButton(configuration: configuration, primaryAction: nil)
使用cornerStyle控制角的半径
UIButton。配置有许多内置的角样式供您选择。你可以用cornerStyle属性来设置。
configuration.cornerStyle = .small
configuration.cornerStyle = .medium
configuration.cornerStyle = .large
configuration.cornerStyle = .capsule
自定义角半径
如果你想要一些更独特的东西,你可以通过UIBackgroundConfiguration的cornerRadius指定角的半径。
var configuration = UIButton.Configuration.filled()
configuration.title = "Button"
configuration.baseBackgroundColor = UIColor.systemPink
configuration.contentInsets = NSDirectionalEdgeInsets(
top: 10,
leading: 20,
bottom: 10,
trailing: 20
)
configuration.background.cornerRadius = 20
configuration.cornerStyle = .fixed
let button = UIButton(configuration: configuration, primaryAction: nil)
在swift 4中进行了测试
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
如果你像这样在检查器中启用它:
它将添加用户定义的运行时属性,结果是:
(我之前添加了拐角半径= 8)
:)
你需要添加masksToBounds = true的组合之间的corderRadius shadowRadius。
button.layer.masksToBounds = false;
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)