在iOS中投放阴影 [英] Drop shadow in ios

问题描述

如何在iOS中放置对象阴影?

How to drop an object shadow in iOS?

我的对象是UIImageView，我想放置一个椭圆形阴影.请参考图像以供参考.

My object is UIImageView and i want to drop an elliptical shadow.Please refer image for reference.

推荐答案

最好使用其他图像显示阴影.使用模糊图像或更改图像视图的Alpha.

Better you use another image for showing shadow. Use blur image or change alpha of the imageview.

或者，如果您要通过编程方式进行操作，请尝试:

Or if you want to do it programmatically, try it:

Obj c:

//create elliptical shadow for image through UIBezierPath
CGRect ovalRect = CGRectMake(0.0f, _imageView.frame.size.height + 10, _imageView.frame.size.width, 15);
UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:ovalRect];

 //applying shadow to path
 _imageView.layer.shadowColor = kShadowColor.CGColor;
 _imageView.layer.shadowOffset = CGSizeMake(0.0, 0.0);
 _imageView.layer.shadowOpacity = 1.0;
 _imageView.layer.shadowRadius = 3.0;
 _imageView.layer.shadowPath = path.CGPath;

Swift:

//create elliptical shdow forimage through UIBezierPath
var ovalRect = CGRectMake(0.0, imageView.frame.size.height + 10, imageView.frame.size.width, 15)
var path = UIBezierPath(ovalInRect: ovalRect)

//applying shadow to path
imageView.layer.shadowColor = UIColor(white: 0.0, alpha: 0.5).CGColor
 imageView.layer.shadowOffset = CGSizeMake(0.0, 0.0)
imageView.layer.shadowOpacity = 1.0
imageView.layer.shadowRadius = 3.0
imageView.layer.shadowPath = path.CGPath

输出:

来自 http://www.innofied.com/implementing-shadow-ios/并了解更多信息:带有圆角和投影?

Taken from http://www.innofied.com/implementing-shadow-ios/ and also have a look to know more: UIView with rounded corners and drop shadow?

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