UIView shadow not working with custom extension

Add a drop shadow to a UIView. GitHub Gist: instantly share code, notes, and snippets.

All you need to do in order to add a shadow to a UIView object is to set the shadow properties of the view's layer.

可從User Defined Runtime Attributes 設定三種常見的陰影效果，layer.shadowOpacity，layer.shadowOffset 和layer.shadowRadius。

當處理圖片圓角時，須clipToBounds = true，image view才能把image裁切掉，但shadow是影響在image所以也會被裁切掉。需要同時有cornerRadius與shadow，則 ...

I am trying to add a shadow to my UIViews using a custom extension that I created for the UIView class. Here is the code for the extension.

If you want to add shadow then do this : viewLoginCustom.dropShadow(color: yourColor, opacity: 1, offSet: CGSize.zero, radius: 3, scale: true)

預設值為0，也就是完全透明； 所以如果只是要陰影，並沒有需要客製化的話， 只需要修改shadowOpacity，畫面上就會有offset = [0, -3], radius = 3 的不透明黑色 ...

layer.shadowOffset = CGSize.init(width: 0, height: 3) layer.shadowColor = UIColor.gray.cgColor layer.shadowRadius = 3 layer.shadowOpacity = 0.4

iOS can dynamically generate shadows for any UIView, and these shadows automatically adjust to fit the shape of the item in question.

In this article we're going to look at some of the various effects you can create using shadows, all by manipulating the layer properties.