Cody Weaver 3c636c1704
[ShadowLayer] Subclass UIView in corner radius example (#5388)
### Context
In working on #4848 I noticed that the example uses an UILabel which may have a different backing layer (possibly CATextLayer) than UIView. This change makes it easier for another team member to address this issue.
### The fix
Subclass UIView which I believe is the most common use case for using a custom shadow layer in this example.
### Related issue
#4848
### Videos
| Before | After |
| - | - |
|![develop](https://user-images.githubusercontent.com/7131294/46751924-efc43800-cc89-11e8-8327-b05f6bb5f3f3.gif)|![shadowafter](https://user-images.githubusercontent.com/7131294/46751933-f357bf00-cc89-11e8-9e17-eea6dd0dd7bd.gif)|
2018-10-10 13:33:15 -04:00
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