ios UIButton底部阴影
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UIButton bottom shadow
提问by Neelesh
I have a UIButtonwhich is very similar to the standard iOS keyboard alphabet button.
我有一个UIButton与标准 iOS 键盘字母按钮非常相似的按钮。
I am not sure how to create a shadow only for the bottom layer like how iOS have done.
我不确定如何像 iOS 那样只为底层创建阴影。
I use the below code, but I see a shadow on all the side, not just the bottom:
我使用下面的代码，但我看到所有侧面都有阴影，而不仅仅是底部：
CALayer *buttonLayer = [[CALayer alloc] init];
buttonLayer.shadowColor = [UIColor grayColor].CGColor;
buttonLayer.shadowOffset = CGSizeMake(0.f,1.f);
buttonLayer.masksToBounds = NO;
buttonLayer.shadowOpacity = 1.f;
Can you please tell me how to achieve the same effect. Thanks in advance.
你能告诉我如何达到同样的效果吗？提前致谢。
回答by ricardopereira
You can mix the cornerRadius and shadow properties. I tested it on iOS 8.
您可以混合cornerRadius 和shadow 属性。我在 iOS 8 上测试过。
Objective-C:
目标-C：
[self.globeButton setImage:[UIImage imageNamed:@"Globe"] forState:UIControlStateNormal];
self.globeButton.backgroundColor = [UIColor colorWithRed:171 green:178 blue:186 alpha:1.0f];
// Shadow and Radius
self.globeButton.layer.shadowColor = [[UIColor colorWithRed:0 green:0 blue:0 alpha:0.25f] CGColor];
self.globeButton.layer.shadowOffset = CGSizeMake(0, 2.0f);
self.globeButton.layer.shadowOpacity = 1.0f;
self.globeButton.layer.shadowRadius = 0.0f;
self.globeButton.layer.masksToBounds = NO;
self.globeButton.layer.cornerRadius = 4.0f;
Swift:
迅速：
globeButton.setImage(UIImage(named: "Globe"), forState: .Normal)
globeButton.backgroundColor = UIColor(red: 171/255, green: 178/255, blue: 186/255, alpha: 1.0)
// Shadow and Radius
globeButton.layer.shadowColor = UIColor(red: 0, green: 0, blue: 0, alpha: 0.25).CGColor
globeButton.layer.shadowOffset = CGSize(width: 0.0, height: 2.0)
globeButton.layer.shadowOpacity = 1.0
globeButton.layer.shadowRadius = 0.0
globeButton.layer.masksToBounds = false
globeButton.layer.cornerRadius = 4.0
Result:
结果：
回答by Nik Kov
SWIFT 3
斯威夫特 3
import UIKit
class ButtonWithShadow: UIButton {
override func draw(_ rect: CGRect) {
updateLayerProperties()
}
func updateLayerProperties() {
self.layer.shadowColor = UIColor(red: 0, green: 0, blue: 0, alpha: 0.25).cgColor
self.layer.shadowOffset = CGSize(width: 0, height: 3)
self.layer.shadowOpacity = 1.0
self.layer.shadowRadius = 10.0
self.layer.masksToBounds = false
}
}
!!Only if you do not need corner radius and shadow simultaneously. Otherwise watch this.
!! 仅当您不需要同时使用圆角半径和阴影时。否则看这个。
回答by Aaron
Be sure to also set shadowRadiusto 0:
请务必也设置shadowRadius为 0：
Given a UIButtonproperty named buttonset its backing layer properties like this:
给定一个UIButton名为button设置其支持层属性的属性，如下所示：
self.button.layer.shadowColor = [UIColor grayColor].CGColor;
self.button.layer.shadowOffset = CGSizeMake(0, 1.0);
self.button.layer.shadowOpacity = 1.0;
self.button.layer.shadowRadius = 0.0;
回答by TomSawyer
You can try with this code: (sorry, i only know swift, not obj c. this code will add bottom shadow on your button.
您可以尝试使用此代码：（抱歉，我只知道 swift，而不是 obj c。此代码将在您的按钮上添加底部阴影。
button.layer.masksToBounds = false
button.layer.shadowColor = UIColor(rgb: 0x000000, alpha: 1.0).CGColor
button.layer.shadowOpacity = 1.0
button.layer.shadowRadius = 0
button.layer.shadowOffset = CGSizeMake(0, 1.0)
回答by PinkeshGjr
I have created IBInspectableextension that will help you.
我已经创建IBInspectable了可以帮助您的扩展程序。
You can directly assign from storyboard
您可以直接从 storyboard
Swift 5
斯威夫特 5
//MARK:- IBInspectable
extension UIView {
@IBInspectable var cornerRadius: CGFloat {
get {
return layer.cornerRadius
}
set {
layer.cornerRadius = newValue
layer.masksToBounds = newValue > 0
}
}
@IBInspectable var borderWidth: CGFloat {
get {
return layer.borderWidth
}
set {
layer.borderWidth = newValue
}
}
@IBInspectable var borderColor: UIColor? {
get {
return UIColor(cgColor: layer.borderColor!)
}
set {
layer.borderColor = newValue?.cgColor
}
}
@IBInspectable
var shadowRadius: CGFloat {
get {
return layer.shadowRadius
}
set {
layer.masksToBounds = false
layer.shadowRadius = newValue
}
}
@IBInspectable
var shadowOpacity: Float {
get {
return layer.shadowOpacity
}
set {
layer.masksToBounds = false
layer.shadowOpacity = newValue
}
}
@IBInspectable
var shadowOffset: CGSize {
get {
return layer.shadowOffset
}
set {
layer.masksToBounds = false
layer.shadowOffset = newValue
}
}
@IBInspectable
var shadowColor: UIColor? {
get {
if let color = layer.shadowColor {
return UIColor(cgColor: color)
}
return nil
}
set {
if let color = newValue {
layer.shadowColor = color.cgColor
} else {
layer.shadowColor = nil
}
}
}
}
回答by Pablo Ruan
in swift 2.0 add shadow uiview (uibutton) with code before class declaration or in swift file functions:
在 swift 2.0 中，在类声明之前或在 swift 文件函数中添加带有代码的 shadow uiview (uibutton)：
extension UIView {
func addShadowView(width:CGFloat=0.2, height:CGFloat=0.2, Opacidade:Float=0.7, maskToBounds:Bool=false, radius:CGFloat=0.5){
self.layer.shadowColor = UIColor.blackColor().CGColor
self.layer.shadowOffset = CGSize(width: width, height: height)
self.layer.shadowRadius = radius
self.layer.shadowOpacity = Opacidade
self.layer.masksToBounds = maskToBounds
}
}
in viewdidload add this code
在 viewdidload 添加此代码
button.addShadowView()
回答by CSE 1994
View bottom shadow swift 4.2
查看底部阴影 swift 4.2
viewTop.layer.shadowOffset = CGSize(width: 0, height: 1)
viewTop.layer.shadowColor = UIColor.lightGray.cgColor
viewTop.layer.shadowOpacity = 1
viewTop.layer.shadowRadius = 5
viewTop.layer.masksToBounds = false
回答by Shardul
CornerRadius and shadow don't mix well on the same layer. So you will have to embed your "to be cornered" UIButton inside an UIView. The shadow will be applied on this UIView.
CornerRadius 和 shadow 在同一层上不能很好地混合。因此，您必须将“被逼入绝境”的 UIButton 嵌入到 UIView 中。阴影将应用于此 UIView。
The following code, given as an example, produces the image below it:
作为示例给出的以下代码生成其下方的图像：
import UIKit
导入 UIKit
class CustomButton: UIButton {
required init(coder decoder: NSCoder) {
super.init(coder: decoder)
backgroundColor = UIColor.whiteColor()
}
override func drawRect(rect: CGRect) {
updateLayerProperties()
}
func updateLayerProperties() {
layer.masksToBounds = true
layer.cornerRadius = 12.0
//superview is your optional embedding UIView
if let superview = superview {
superview.backgroundColor = UIColor.clearColor()
superview.layer.shadowColor = UIColor.darkGrayColor().CGColor
superview.layer.shadowPath = UIBezierPath(roundedRect: bounds, cornerRadius: 12.0).CGPath
superview.layer.shadowOffset = CGSize(width: 2.0, height: 2.0)
superview.layer.shadowOpacity = 1.0
superview.layer.shadowRadius = 2
superview.layer.masksToBounds = true
superview.clipsToBounds = false
}
}
}
回答by Sajal Gupta
Put this method into your UIView extension and play with offset value
将此方法放入您的 UIView 扩展并使用偏移值
func drawShadow(shadowColor: UIColor = UIColor.black, opacity: Float =
0.3, offset: CGSize, radius: CGFloat = 5, shouldRasterize : Bool = false) {
self.layer.shadowColor = shadowColor.cgColor
self.layer.shadowOpacity = opacity
self.layer.shadowOffset = offset
self.layer.shadowRadius = radius
self.layer.shouldRasterize = shouldRasterize
}
回答by tushar
To add shadow to a button with corner radius:
为具有圆角半径的按钮添加阴影：
final class CustomButton: UIButton {
private var shadowLayer: CAShapeLayer!
override func layoutSubviews() {
super.layoutSubviews()
if shadowLayer == nil {
shadowLayer = CAShapeLayer()
shadowLayer.path = UIBezierPath(roundedRect: bounds, cornerRadius: 33).cgPath
if self.backgroundColor != nil {
shadowLayer.fillColor = self.backgroundColor?.cgColor
}
else{
shadowLayer.fillColor = UIColor.white.cgColor
}
shadowLayer.shadowColor = UIColor.gray.cgColor
shadowLayer.shadowPath = shadowLayer.path
shadowLayer.shadowOffset = CGSize(width: 0.0, height: 3.0)
shadowLayer.shadowOpacity = 0.4
shadowLayer.shadowRadius = 2
layer.insertSublayer(shadowLayer, at: 0)
}
}
}
