ios UIView 的左右阴影
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Shadow left and right of UIView
提问by Zeropointer
Hi i like to add an CALayer Shadow to an View where the shadow was left and right of the view the simplest way was:
嗨，我喜欢向视图中添加一个 CALayer 阴影，其中阴影位于视图的左侧和右侧，最简单的方法是：
someView.layer.shadowColor = [[UIColor blackColor] CGColor];
someView.layer.shadowOffset = CGSizeMake(0.0f,0.0f);
someView.layer.shadowOpacity = 1.0f;
someView.layer.shadowRadius = 10.0f;
someView.layer.shadowPath = [[UIBezierPath bezierPathWithRect:someView.bounds] CGPath];
but i will add a bigger shadow as like a shadow when i increase the shadowRadius it do not look good. How i can make a shadow that looks good at left and right.
但是当我增加 shadowRadius 时，我会添加一个更大的阴影，就像阴影一样，它看起来不太好。我如何制作左右两边都很好的阴影。
回答by progrmr
I think 10 is a pretty big shadow radius, try 3 or 4 instead, also opacity I usually use 0.7:
我认为 10 是一个相当大的阴影半径，请尝试使用 3 或 4，还有不透明度我通常使用 0.7：
someView.layer.shadowColor = [[UIColor blackColor] CGColor];
someView.layer.shadowOffset = CGSizeMake(0.0f,0.0f);
someView.layer.shadowOpacity = 0.7f;
someView.layer.shadowRadius = 4.0f;
If you want the shadow only on left and right, then inset the rectangle on the top and bottom so the top and bottom shadow are hidden behind your view:
如果您只想要左侧和右侧的阴影，则在顶部和底部插入矩形，以便顶部和底部阴影隐藏在您的视图后面：
CGRect shadowRect = CGRectInset(someView.bounds, 0, 4); // inset top/bottom
someView.layer.shadowPath = [[UIBezierPath bezierPathWithRect:shadowRect] CGPath];
I'm not really sure if that's what you wanted.
我不确定这是否是你想要的。
回答by Fangming
swift 3.0 version
迅捷3.0版本
imageView.layer.shadowOpacity = 0.8
imageView.layer.shadowOffset = CGSize(width: 0, height: 3)
imageView.layer.shadowRadius = 4.0
let shadowRect: CGRect = imageView.bounds.insetBy(dx: 0, dy: 4)
imageView.layer.shadowPath = UIBezierPath(rect: shadowRect).cgPath
回答by Johan Tingbacke
progrmr's answer was very helpful, cheers!
progrmr 的回答很有帮助，干杯！
I made a slide-out menu and I had a problem with the shadow surrounding my VC and disrupting the navigation bar. Turned out I had to inset the shadow layer.
我制作了一个滑出式菜单，但我的 VC 周围的阴影出现了问题并扰乱了导航栏。结果我不得不插入阴影层。
Here's my solution using swift:
这是我使用 swift 的解决方案：
rightViewController!.view.layer.shadowOpacity = 0.8
rightViewController!.view.layer.shadowOffset = CGSizeMake(0, 3)
rightViewController!.view.layer.shadowRadius = 4.0
let shadowRect: CGRect = CGRectInset(rightViewController!.view.bounds, 0, 4); // inset top/bottom
rightViewController!.view.layer.shadowPath = UIBezierPath(rect: shadowRect).CGPath
