swift - Can we hide a UIView partially in iOS -


i have partially hide uiview when user scrolls on it. there uiscrollview above uiview. example in given image below want hide area covered under scrollable area in blue color. views background colors clear color.

enter image description here

i want hide part given in below image, marked rectangle in red color. part of text (one, two, three) visible. enter image description here

each uiview, including uiscrollview, has core animation layer (a calayer).

you access calayer with

view.layer

in turn, calayer has mask, access with

layer.mask

using mask comprehensive method of controlling visibility , opacity @ runtime.


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