ios - How to compare and change value of constrain programatically? -


i have given constrains uiimageview xib. code can constrains of image code imageview.constraints . want change trailing , leading, top , bottom constrains constant values. have loop through , code below:

for constrain in imageview.constraints {      if  constrain.firstattribute == nslayoutattribute.trailing     {         constrain.constant = hpadding     }     if constrain.firstattribute == nslayoutattribute.leading     {         constrain.constant = hpadding     }     if constrain.firstattribute == nslayoutattribute.top     {         constrain.constant = vpadding     }     if constrain.firstattribute == nslayoutattribute.bottom     {         constrain.constant = vpadding     } }

but non of conditions excited. please me solve issue. missing?


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