问题描述
在iOS音乐应用中，我注意到专辑封面下的阴影会根据艺术作品的颜色而变化。根据图稿边缘的颜色如何变化，此阴影也可以是多色的。
In the iOS music app, I've noticed the shadow underneath album artwork changes based on the color of the artwork. This shadow can also be multi-colored based on how the color at the edge of the artwork changes.
有没有人知道如何以编程方式重新创建此效果？
Does anyone know how to recreate this effect programmatically?
推荐答案
感谢@Josh Homann指出我正确的方向，但答案实际上要复杂得多。
Thanks to @Josh Homann for pointing me in the right direction, but the answer was actually much more complex.
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层次结构中的第一个（底部）UIView应该具有纯白色背景并固定在屏幕边缘。
The first (bottom) UIView in the hierarchy should have a plain white background and be pinned to the edges of the screen.
下一个视图应该是一个字母为0.75的UIImageView。
The next view should be a UIImageView with an alpha of 0.75.
然后你应该添加一个UIVisualEffectView维度作为第一个视图。
Then you should add a UIVisualEffectView with the same dimensions as the first view.
最后，添加另一个与第一个UIImageView 相同大小的UIImageView。
Finally, add another UIImageView that is the same size as the first UIImageView.
您的IB层次结构应该类似于：
Your IB hierarchy should look similar to this:
最终结果如下：
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