![](https://cdn-images-1.medium.com/fit/t/1600/480/1*dmlgb7Qi09bch2821IEOBA.jpeg)
實現陰影效果的 layer.shadow + xxx
可從 User Defined Runtime Attributes 設定三種常見的陰影效果,layer.shadowOpacity,layer.shadowOffset 和 layer.shadowRadius。
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