objective c - ios - Control some values of AutoLayout at runtime -


i'm trying implement custom slider , want slider's y position set in auto layout (center y bar) want control x position in code (so = 0 unless it)

everything seems fine, everytime auto-layout updates slider's x position goes 0. how can fix that?

another thing thought of make reference constraint between slider , bar, problem don't know how make constraint between slider's center , bar's left side.


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