如何在 iOS 中放置对象阴影?
user5180348
问问题
741 次
2 回答
3
最好使用另一个图像来显示阴影。使用模糊图像或更改图像视图的 alpha。
或者,如果您想以编程方式执行此操作,请尝试:
目标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;
斯威夫特:
//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?
于 2016-10-20T13:20:40.903 回答
0
您可以像这样使用 CAShapeLayer:
目标-C:
// init CAShapeLayer
CAShapeLayer *shadowLayer = [CAShapeLayer layer];
shadowLayer.frame = CGRectMake(CGRectGetMinX(_imageView.frame), CGRectGetMaxY(_imageView.frame), _imageView.frame.size.width, _imageView.frame.size.height);
shadowLayer.path = [UIBezierPath bezierPathWithOvalInRect:shadowLayer.bounds].CGPath;
shadowLayer.fillColor = [UIColor colorWithWhite:0 alpha:0.02].CGColor;
shadowLayer.lineWidth = 0;
[self.view.layer addSublayer: shadowLayer];
斯威夫特 3
let shadowLayer = CAShapeLayer()
shadowLayer.frame = CGRect(x: imageView.frame.minX, y: imageView.frame.maxY, width: imageView.frame.width, height: imageView.frame.height * 0.25)
shadowLayer.path = UIBezierPath(ovalIn: shadowLayer.bounds).cgPath
shadowLayer.fillColor = UIColor(white: 0, alpha: 0.02).cgColor
shadowLayer.lineWidth = 0
view.layer.addSublayer(shadowLayer)
输出:
于 2016-10-20T13:22:18.237 回答