ios - How to lower brightness with UISlider so that it is lower than the lowest brightness setting available to the user? -

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i making clock application designed used display time @ night. want find way make brightness lower user can make it, such done in app (https://itunes.apple.com/us/app/night-clock/id293660080?mt=8). have tried uiscreen.mainscreen().brightness = cgfloat(0), goes dark user can make it. help?

just dim contents displayed app.

instead of adjusting colors can same effect adding overlay view. set backgroundcolor of view black alpha 0.5, , play alpha value.


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