ios - Desaturate a live UIView layer (not a UIImageView) -

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i'm wondering best way desaturate uiview—particularly, uisliderview custom appearance applied it. in ios 7, standard controls fade out tint colors when view appears on them (for example, share sheet or uialertview), since mine built uiimages, tint property doesn't apply it, , remain saturated. there good, easy way desaturate this, short of re-applying new uiappearance it? (if go route, able animate transition colored images greyscale ones?)

thanks in advance!


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