swift - UIView invert mask MaskView - Stack Overflow
![iOS]UIView Mask를 이용해 view 일부만 표시하기](https://t1.daumcdn.net/cfile/tistory/99BD9F355EB8F9A624 "iOS]UIView Mask를 이용해 view 일부만 표시하기")
iOS]UIView Mask를 이용해 view 일부만 표시하기
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How To Create Mask one UIView using Another UIView ? - iOSDevCenter
