xcode - IOS Auto Lay out dynamic leading and trailing constraints -

how can set dynamic leading , trailing constraints give dynamic width , height through percentage of screen size.

try this
add below property in viewcontroller

@property (strong, nonatomic) iboutlet nslayoutconstraint *cnstviewleading; @property (strong, nonatomic) iboutlet nslayoutconstraint *cnstviewtrailing; 

then set outlet leading , trailing ......

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and

use this

//    replace value whatever want 0     self.cnstviewleading.constant = 0;     self.cnstviewtrailing.constant = 0;