blocks|key|192454|text|我知道你说设置layer.shadowOffset对你不起作用，但是你可以设置负值，这样设置layer.shadowOffset+=+CGSizeMake(0.0,+-2.0)就会接近你想要的效果，当然我希望它在三个方面都是一样的。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|192455|现在让我们来看看layer.shadowPath吧！|192456|UIView+*block1+=+[[UIView+alloc]+initWithFrame:CGRectMake(32.0,+32.0,+128.0,+128.0)];
[block1+setBackgroundColor:[UIColor+orangeColor]];
[self.view+addSubview:block1];

block1.layer.masksToBounds+=+NO;
block1.layer.shadowOffset+=+CGSizeMake(0,+0);
block1.layer.shadowRadius+=+1;
block1.layer.shadowOpacity+=+0.7;

UIBezierPath+*path+=+[UIBezierPath+bezierPath];

//+Start+at+the+Top+Left+Corner
[path+moveToPoint:CGPointMake(0.0,+0.0)];

//+Move+to+the+Top+Right+Corner
[path+addLineToPoint:CGPointMake(CGRectGetWidth(block1.frame),+0.0)];

//+Move+to+the+Bottom+Right+Corner
[path+addLineToPoint:CGPointMake(CGRectGetWidth(block1.frame),+CGRectGetHeight(block1.frame))];

//+This+is+the+extra+point+in+the+middle+:)+Its+the+secret+sauce.
[path+addLineToPoint:CGPointMake(CGRectGetWidth(block1.frame)+/+2.0,+CGRectGetHeight(block1.frame)+/+2.0)];

//+Move+to+the+Bottom+Left+Corner
[path+addLineToPoint:CGPointMake(0.0,+CGRectGetHeight(block1.frame))];

//+Move+to+the+Close+the+Path
[path+closePath];

block1.layer.shadowPath+=+path.CGPath;|code-block|syntax|javascript|192457|为了让你知道发生了什么，这里是你刚刚绘制的实际阴影路径:)|192458|​|192459|📷|atomic|192460|192461|可以只将额外中点移动到其他行之前或之后，以选择将省略哪一侧。|192462|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/25de936492c6cbd3f05565df3b43707f.png|imageAlt^0|7|I|1A|16|0|8|G|0|0|0|0|0|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|15|8|@$9|16|A|17|B|C]|$9|18|A|19|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1A|8|@$9|1B|A|1C|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|1D|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1E|8|@]|D|@]|E|$]]|$1|O|3|P|5|6|7|1F|8|@]|D|@]|E|$]]|$1|Q|3|R|5|S|7|1G|8|@]|D|@$9|1H|A|1I|1|1J]]|E|$]]|$1|T|3|P|5|6|7|1K|8|@]|D|@]|E|$]]|$1|U|3|V|5|6|7|1L|8|@]|D|@]|E|$]]|$1|W|3|-4|5|6|7|1M|8|@]|D|@]|E|$]]]|X|$Y|$5|Z|10|11|E|$12|13|14|-4]]]]

I know you say setting <code>layer.shadowOffset</code> won't work for you, but you are allowed to put in negative values so setting it <code>layer.shadowOffset = CGSizeMake(0.0, -2.0)</code> would come close to the effect you're looking for but of course I expect you want it to be even on the three sides.

So here we go with <code>layer.shadowPath</code>!

<pre><code>UIView *block1 = [[UIView alloc] initWithFrame:CGRectMake(32.0, 32.0, 128.0, 128.0)];
[block1 setBackgroundColor:[UIColor orangeColor]];
[self.view addSubview:block1];

block1.layer.masksToBounds = NO;
block1.layer.shadowOffset = CGSizeMake(0, 0);
block1.layer.shadowRadius = 1;
block1.layer.shadowOpacity = 0.7;

UIBezierPath *path = [UIBezierPath bezierPath];

// Start at the Top Left Corner
[path moveToPoint:CGPointMake(0.0, 0.0)];

// Move to the Top Right Corner
[path addLineToPoint:CGPointMake(CGRectGetWidth(block1.frame), 0.0)];

// Move to the Bottom Right Corner
[path addLineToPoint:CGPointMake(CGRectGetWidth(block1.frame), CGRectGetHeight(block1.frame))];

// This is the extra point in the middle :) Its the secret sauce.
[path addLineToPoint:CGPointMake(CGRectGetWidth(block1.frame) / 2.0, CGRectGetHeight(block1.frame) / 2.0)];

// Move to the Bottom Left Corner
[path addLineToPoint:CGPointMake(0.0, CGRectGetHeight(block1.frame))];

// Move to the Close the Path
[path closePath];

block1.layer.shadowPath = path.CGPath;
</code></pre>

And to give you an idea of whats going on, here is the actual shadow path you just drew :)

<img src="https://i.stack.imgur.com/bXyGk.png" alt="enter image description here">

Its possible to just shift that extra middle point before or after the other lines to choose which side will be omitted.

blocks|key|2816117|text|将Ryan+Poolos+Answer更新到Swift+3.0|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2816118|感谢Ryan+Poolos|2816119|class+sampleViewController:+UIViewController+{
++++var+block1:+UIView!+=+nil

++++override+func+viewDidLoad()+{

++++++++super.viewDidLoad()
++++++++block1+=+UIView(frame:+CGRect(x:+32.0,+y:+32.0,+width:+128.0,+height:+128.0))
++++++++block1.backgroundColor+=+UIColor.orange
++++++++self.view.addSubview(block1)

++++++++block1.layer.masksToBounds+=+false
++++++++block1.layer.shadowOffset+=+CGSize(width:+0.0,+height:+0.0)
++++++++block1.layer.shadowRadius+=+1.0
++++++++block1.layer.shadowOpacity+=+0.7

++++++++let+path+=+UIBezierPath()

++++++++//+Start+at+the+Top+Left+Corner
++++++++path.move(to:+CGPoint(x:+0.0,+y:+0.0))

++++++++//+Move+to+the+Top+Right+Corner
++++++++path.addLine(to:+CGPoint(x:+block1.frame.size.width,+y:+0.0))

++++++++//+Move+to+the+Bottom+Right+Corner
++++++++path.addLine(to:+CGPoint(x:+block1.frame.size.width,+y:+block1.frame.size.height))

++++++++//+This+is+the+extra+point+in+the+middle+:)+Its+the+secret+sauce.
++++++++path.addLine(to:+CGPoint(x:+block1.frame.size.width/2.0,+y:+block1.frame.size.height/2.0))

++++++++//+Move+to+the+Bottom+Left+Corner
++++++++path.addLine(to:+CGPoint(x:+0.0,+y:+block1.frame.size.height))

++++++++path.close()

++++++++block1.layer.shadowPath+=+path.cgPath
++++}
}|code-block|syntax|javascript|2816120|结果：|2816121|​|2816122|📷|atomic|2816123|2816124|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/64c28f76f5c6e81f7069947c47101c9a.png|imageAlt^0|1|B|0|2|B|0|0|0|3|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|13|8|@$9|14|A|15|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|16|8|@$9|17|A|18|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|19|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1A|8|@$9|1B|A|1C|B|C]]|D|@]|E|$]]|$1|O|3|P|5|6|7|1D|8|@]|D|@]|E|$]]|$1|Q|3|R|5|S|7|1E|8|@]|D|@$9|1F|A|1G|1|1H]]|E|$]]|$1|T|3|P|5|6|7|1I|8|@]|D|@]|E|$]]|$1|U|3|-4|5|6|7|1J|8|@]|D|@]|E|$]]]|V|$W|$5|X|Y|Z|E|$10|11|12|-4]]]]

Updating Ryan Poolos Answer to Swift 3.0

Thanks to Ryan Poolos

<pre><code>class sampleViewController: UIViewController {
 var block1: UIView! = nil

 override func viewDidLoad() {

 super.viewDidLoad()
 block1 = UIView(frame: CGRect(x: 32.0, y: 32.0, width: 128.0, height: 128.0))
 block1.backgroundColor = UIColor.orange
 self.view.addSubview(block1)

 block1.layer.masksToBounds = false
 block1.layer.shadowOffset = CGSize(width: 0.0, height: 0.0)
 block1.layer.shadowRadius = 1.0
 block1.layer.shadowOpacity = 0.7

 let path = UIBezierPath()

 // Start at the Top Left Corner
 path.move(to: CGPoint(x: 0.0, y: 0.0))

 // Move to the Top Right Corner
 path.addLine(to: CGPoint(x: block1.frame.size.width, y: 0.0))

 // Move to the Bottom Right Corner
 path.addLine(to: CGPoint(x: block1.frame.size.width, y: block1.frame.size.height))

 // This is the extra point in the middle :) Its the secret sauce.
 path.addLine(to: CGPoint(x: block1.frame.size.width/2.0, y: block1.frame.size.height/2.0))

 // Move to the Bottom Left Corner
 path.addLine(to: CGPoint(x: 0.0, y: block1.frame.size.height))

 path.close()

 block1.layer.shadowPath = path.cgPath
 }
}
</code></pre>

Result: 

<a href="https://i.stack.imgur.com/5jE9b.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/5jE9b.png" alt="image"></a>

blocks|key|2816196|text|多亏了Ashok+R的快速代码，对其他答案有了一点改进。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2816197|因为我们在视图的背景中创建了一个在所有边都有阴影的三角形视图，所以不需要在边阴影上有一个白色的三角形。|2816198|如果视图的宽度比高度大，它就会中断。|2816199|​|2816200|📷|atomic|2816201|2816202|一种解决方法是将不需要阴影的线的路径稍微向视图一侧移动一点，而不是完全地创建三角形视图路径。|2816203|我为此创建了一个扩展-|2816204|extension+UIView+{
++++func+addshadow(top:+Bool,
+++++++++++++++++++left:+Bool,
+++++++++++++++++++bottom:+Bool,
+++++++++++++++++++right:+Bool,
+++++++++++++++++++shadowRadius:+CGFloat+=+2.0)+{

++++++++self.layer.masksToBounds+=+false
++++++++self.layer.shadowOffset+=+CGSize(width:+0.0,+height:+0.0)
++++++++self.layer.shadowRadius+=+shadowRadius
++++++++self.layer.shadowOpacity+=+1.0

++++++++let+path+=+UIBezierPath()
++++++++var+x:+CGFloat+=+0
++++++++var+y:+CGFloat+=+0
++++++++var+viewWidth+=+self.frame.width
++++++++var+viewHeight+=+self.frame.height

++++++++//+here+x,+y,+viewWidth,+and+viewHeight+can+be+changed+in
++++++++//+order+to+play+around+with+the+shadow+paths.
++++++++if+(!top)+{
++++++++++++y%2B=(shadowRadius%2B1)
++++++++}
++++++++if+(!bottom)+{
++++++++++++viewHeight-=(shadowRadius%2B1)
++++++++}
++++++++if+(!left)+{
++++++++++++x%2B=(shadowRadius%2B1)
++++++++}
++++++++if+(!right)+{
++++++++++++viewWidth-=(shadowRadius%2B1)
++++++++}
++++++++//+selecting+top+most+point
++++++++path.move(to:+CGPoint(x:+x,+y:+y))
++++++++//+Move+to+the+Bottom+Left+Corner,+this+will+cover+left+edges
++++++++/*
+++++++++%7C☐
+++++++++*/
++++++++path.addLine(to:+CGPoint(x:+x,+y:+viewHeight))
++++++++//+Move+to+the+Bottom+Right+Corner,+this+will+cover+bottom+edge
++++++++/*
+++++++++☐
+++++++++-
+++++++++*/
++++++++path.addLine(to:+CGPoint(x:+viewWidth,+y:+viewHeight))
++++++++//+Move+to+the+Top+Right+Corner,+this+will+cover+right+edge
++++++++/*
+++++++++☐%7C
+++++++++*/
++++++++path.addLine(to:+CGPoint(x:+viewWidth,+y:+y))
++++++++//+Move+back+to+the+initial+point,+this+will+cover+the+top+edge
++++++++/*
+++++++++_
+++++++++☐
+++++++++*/++++++++
++++++++path.close()
++++++++self.layer.shadowPath+=+path.cgPath
++++}|code-block|syntax|javascript|2816205|并将希望阴影出现的任何一侧的布尔值设置为true|2816206|myView.addshadow(top:+false,+left:+true,+bottom:+true,+right:+true,+shadowRadius:+2.0)|style|CODE|2816207|2816208|+//上述阴影半径是可选的，默认设置为2.0|blockquote|2816209|2816210|2816211|2816212|2816213|2816214|或myView.addshadow(top:+true,+left:+true,+bottom:+true,+right:+true,+shadowRadius:+2.0)|2816215|2816216|2816217|2816218|或myView.addshadow(top:+false,+left:+false,+bottom:+true,+right:+true,+shadowRadius:+2.0)|2816219|2816220|2816221|2816222|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/users/3647770/ashok-r|1|IMAGE|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/b23fb82e08f5ec9353a5d5b0d0f4b235.png|imageAlt|2|https://ask.qcloudimg.com/http-save/yehe-900000/9eb5303a91f700097d8da61e06bc5efe.png|3|https://ask.qcloudimg.com/http-save/yehe-900000/e52ade9d4c5d37113161e8e5a293c798.png|4|https://ask.qcloudimg.com/http-save/yehe-900000/d5e86973dd73bc57a83ee0a09c763b37.png^0|3|7|0|0|0|0|0|0|1|1|0|0|0|0|0|0|0|2E|0|0|0|0|0|0|0|1|2|0|0|1|2D|0|0|0|1|3|0|0|1|2F|0|0|0|1|4|0|0^^$0|@$1|2|3|4|5|6|7|25|8|@]|9|@$A|26|B|27|1|28]]|C|$]]|$1|D|3|E|5|6|7|29|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|2A|8|@]|9|@]|C|$]]|$1|H|3|I|5|6|7|2B|8|@]|9|@]|C|$]]|$1|J|3|K|5|L|7|2C|8|@]|9|@$A|2D|B|2E|1|2F]]|C|$]]|$1|M|3|I|5|6|7|2G|8|@]|9|@]|C|$]]|$1|N|3|O|5|6|7|2H|8|@]|9|@]|C|$]]|$1|P|3|Q|5|6|7|2I|8|@]|9|@]|C|$]]|$1|R|3|S|5|T|7|2J|8|@]|9|@]|C|$U|V]]|$1|W|3|X|5|6|7|2K|8|@]|9|@]|C|$]]|$1|Y|3|Z|5|6|7|2L|8|@$A|2M|B|2N|10|11]]|9|@]|C|$]]|$1|12|3|-4|5|6|7|2O|8|@]|9|@]|C|$]]|$1|13|3|14|5|15|7|2P|8|@]|9|@]|C|$]]|$1|16|3|-4|5|6|7|2Q|8|@]|9|@]|C|$]]|$1|17|3|-4|5|6|7|2R|8|@]|9|@]|C|$]]|$1|18|3|I|5|6|7|2S|8|@]|9|@]|C|$]]|$1|19|3|K|5|L|7|2T|8|@]|9|@$A|2U|B|2V|1|2W]]|C|$]]|$1|1A|3|I|5|6|7|2X|8|@]|9|@]|C|$]]|$1|1B|3|1C|5|6|7|2Y|8|@$A|2Z|B|30|10|11]]|9|@]|C|$]]|$1|1D|3|I|5|6|7|31|8|@]|9|@]|C|$]]|$1|1E|3|K|5|L|7|32|8|@]|9|@$A|33|B|34|1|35]]|C|$]]|$1|1F|3|I|5|6|7|36|8|@]|9|@]|C|$]]|$1|1G|3|1H|5|6|7|37|8|@$A|38|B|39|10|11]]|9|@]|C|$]]|$1|1I|3|I|5|6|7|3A|8|@]|9|@]|C|$]]|$1|1J|3|K|5|L|7|3B|8|@]|9|@$A|3C|B|3D|1|3E]]|C|$]]|$1|1K|3|I|5|6|7|3F|8|@]|9|@]|C|$]]|$1|1L|3|-4|5|6|7|3G|8|@]|9|@]|C|$]]]|1M|$1N|$5|1O|1P|1Q|C|$1R|1S]]|1T|$5|1U|1P|1V|C|$1W|1X|1Y|-4]]|1Z|$5|1U|1P|1V|C|$1W|20|1Y|-4]]|21|$5|1U|1P|1V|C|$1W|22|1Y|-4]]|23|$5|1U|1P|1V|C|$1W|24|1Y|-4]]]]

A bit of improvement for other answers, thanks to <a href="https://stackoverflow.com/users/3647770/ashok-r">Ashok R</a> for swift code.

Since we were creating a triangular view in the background of the view with shadow on all sides, and a white triangle on the sides shadow is not needed.

It breaks in case of views with width comparatively larger than height.

<a href="https://i.stack.imgur.com/zjHwm.png" rel="noreferrer"><img src="https://i.stack.imgur.com/zjHwm.png" alt="image with triangle shadow"></a>

A workaround will be to shift the path for the line where shadow is not needed a bit towards that side of view, instead of creating the triangular view Path completely.

I have created an extension for that - 

<pre><code>extension UIView {
 func addshadow(top: Bool,
 left: Bool,
 bottom: Bool,
 right: Bool,
 shadowRadius: CGFloat = 2.0) {

 self.layer.masksToBounds = false
 self.layer.shadowOffset = CGSize(width: 0.0, height: 0.0)
 self.layer.shadowRadius = shadowRadius
 self.layer.shadowOpacity = 1.0

 let path = UIBezierPath()
 var x: CGFloat = 0
 var y: CGFloat = 0
 var viewWidth = self.frame.width
 var viewHeight = self.frame.height

 // here x, y, viewWidth, and viewHeight can be changed in
 // order to play around with the shadow paths.
 if (!top) {
 y+=(shadowRadius+1)
 }
 if (!bottom) {
 viewHeight-=(shadowRadius+1)
 }
 if (!left) {
 x+=(shadowRadius+1)
 }
 if (!right) {
 viewWidth-=(shadowRadius+1)
 }
 // selecting top most point
 path.move(to: CGPoint(x: x, y: y))
 // Move to the Bottom Left Corner, this will cover left edges
 /*
 |☐
 */
 path.addLine(to: CGPoint(x: x, y: viewHeight))
 // Move to the Bottom Right Corner, this will cover bottom edge
 /*
 ☐
 -
 */
 path.addLine(to: CGPoint(x: viewWidth, y: viewHeight))
 // Move to the Top Right Corner, this will cover right edge
 /*
 ☐|
 */
 path.addLine(to: CGPoint(x: viewWidth, y: y))
 // Move back to the initial point, this will cover the top edge
 /*
 _
 ☐
 */ 
 path.close()
 self.layer.shadowPath = path.cgPath
 }
</code></pre>

and set the boolean true for whichever side you want the shadow to appear

<code>myView.addshadow(top: false, left: true, bottom: true, right: true, shadowRadius: 2.0)</code>

<blockquote>
 // shadow radius is optional above and is set as default at 2.0
</blockquote>

<a href="https://i.stack.imgur.com/R0crX.png" rel="noreferrer"><img src="https://i.stack.imgur.com/R0crX.png" alt="enter image description here"></a>

or 
<code>myView.addshadow(top: true, left: true, bottom: true, right: true, shadowRadius: 2.0)</code>

<a href="https://i.stack.imgur.com/5Uzza.png" rel="noreferrer"><img src="https://i.stack.imgur.com/5Uzza.png" alt="enter image description here"></a>

or 
<code>myView.addshadow(top: false, left: false, bottom: true, right: true, shadowRadius: 2.0)</code>

<a href="https://i.stack.imgur.com/fSx0x.png" rel="noreferrer"><img src="https://i.stack.imgur.com/fSx0x.png" alt="enter image description here"></a>

blocks|key|3028685|text|尝尝这个|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3028686|extension+CALayer+{
func+applySketchShadow(color:+UIColor,+alpha:+CGFloat,+x:+CGFloat,+y:+CGFloat,+blur:+CGFloat,+spread:+CGFloat)
{
++++shadowColor+=+color.cgColor
++++shadowOpacity+=+alpha
++++shadowOffset+=+CGSize(width:+x,+height:+y)
++++shadowRadius+=+blur+/+2.0
++++if+spread+==+0+{
++++++++shadowPath+=+nil
++++}+else+{
++++++++let+dx+=+-spread
++++++++let+rect+=+bounds.insetBy(dx:+dx,+dy:+dx)
++++++++shadowPath+=+UIBezierPath(rect:+rect).cgPath
++++}
}|code-block|syntax|javascript|3028687|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Try this 

<pre><code>extension CALayer {
func applySketchShadow(color: UIColor, alpha: CGFloat, x: CGFloat, y: CGFloat, blur: CGFloat, spread: CGFloat)
{
 shadowColor = color.cgColor
 shadowOpacity = alpha
 shadowOffset = CGSize(width: x, height: y)
 shadowRadius = blur / 2.0
 if spread == 0 {
 shadowPath = nil
 } else {
 let dx = -spread
 let rect = bounds.insetBy(dx: dx, dy: dx)
 shadowPath = UIBezierPath(rect: rect).cgPath
 }
}
</code></pre>

I've successfully implemented drawing a shadow around my <code>UIView</code> like this:

<pre><code>block1.layer.masksToBounds = NO;
block1.layer.shadowOffset = CGSizeMake(0, 0);
block1.layer.shadowRadius = 1;
block1.layer.shadowOpacity = 0.7;
</code></pre>

What now happens is I have a rectangular <code>UIView</code> and i would like to draw the shadow around it three sides, leaving the bottom side of it without the shadow. 

I know that I have to specify the <code>block1.layer.shadowPath</code> by creating a new <code>UIBezierPath</code> but I'm not sure how to do it.

Obviously, setting <code>layer.shadowOffset</code> won't do the trick for me.

Thanks in advance!

Draw shadow only from 3 sides of UIView

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我已经成功地在我的UIView周围绘制了一个阴影，如下所示：block1.layer.masksToBounds = NO;block1.layer.shadowOffset = CGSizeMake(0, 0);block1.layer.shadowRadius = 1;block1.layer.shadowOpac...

问仅从UIView的3个侧面绘制阴影
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问仅从UIView的3个侧面绘制阴影
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