ios - How to make transparent modal VC? -

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i have 2 vc. on second vc have color rectangle. vc has transparent background. when second called vc (by clicking button modal action), there rectangle, conceived, vc has transparent background. it's not long time, until end of second appearance of vc. when animation ends appearance of second vc, vc of second background black. how make transparent background of second vc after animation?


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