ios - 在 ios 中放置阴影

Question

如何在 iOS 中放置对象阴影？

我的对象是 UIImageView，我想投下椭圆形阴影。请引用图片以供引用。

Answer 1

最好使用另一张图片来显示阴影。使用模糊图像或更改 imageview 的 alpha。

或者，如果您想以编程方式执行此操作，请尝试:

objective-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:

取自http://www.innofied.com/implementing-shadow-ios/并查看更多信息:UIView with rounded corners and drop shadow?